Thursday, February 20, 2025

Russo-Ukrainian War: The Tula TOZ-66 Shotgun

Source: inukraine.official on Instagram

     Ukrainian troops riding in the back of a pick-up truck or similar vehicle. The soldier taking the video is showing off his anti-drone weapon of choice; a vintage Tula TOZ-66 12-gauge, side-by-side shotgun.

     The Tula Arms Plant introduced the TOZ-66 in 1968 and production ran until 1974. Nevertheless, the ruggedness of the design and having been produced in great numbers, the TOZ-66 saw widespread use well after Tula had moved on to more modern designs. As seen here, the TOZ-66 can still be found and this soldier is using it to hunt drones rather than game.

     Although the external hammers gives the 8 pound TOZ-66 an antiquated appearance, their use allows the firer to easily see if the shotgun is ready to fire. In the image, the hammers are cocked, meaning the TOZ-66 is ready to fire. Had they been uncocked, the shotgun could be carried loaded with a good measure of safety against accidental discharge. The TOZ-66 has double triggers, allowing the firer to discharge each barrel independently. 

     The TOZ-66 is a break action shotgun, meaning, to reload, the firer uses the center lever just behind the breech to unlatch the barrels which hinge downward. This downward motion engages an extractor catch which ejects the spent shells. The firer loads new shells then brings the barrels up, engaging the latch. After cocking the hammers, the TOZ-66 is ready to fire. The rate of fire is purely based on how trained the operator is in reloading.


Wednesday, February 19, 2025

Russo-Ukrainian War: The PKM GPMG

Source: davinciwolves on Instagram

     A machine-gunner of the 108th. Mechanized Battalion “Da Vinci Wolves”, 59th. Motorized Brigade “Yakiv Handziuk”. He is armed with a PKM general purpose machine gun (GPMG), one of the most common machine-guns in use by the Ukrainian military as well as the armed forces of the Russian Federation. Entering service in 1961 as the PK (Pulemyot Kalashnikova; Kalashnikov's machine-gun), the modernized PKM (Модернизированный; Modernized) appearing in 1969. The PKM and its variants remain in production and equip dozens of military forces around the world.

     The PKM is chambered for the Soviet 7.62x54mmR cartridge and the machine-gun uses a gas-operated, long-stroke piston, open/rotating bolt action. The open bolt assists in cooling the breech to prevent ammunition cook-off due to heat generated by automatic fire. The bolt and bolt carrier are upside down and the gas piston and the gas system are mounted beneath the barrel. The cyclic rate of fire of the PKM is 600 to 800 rounds per minute though the practical rate of fire is far less, being 250 rounds per minute. With the cartridge generating a muzzle velocity of 2,707 feet per second, the effective range of the PKM is 1,000 meters though its maximum range is 3,800 meters. Ammunition usually comes in 100-, 200-, or 250-round belts using non-disintegrating metal links with the belts kept in ammunition boxes. The 100-round belt box is considered the “assault” box as it can be attached to the bottom of the PKM. The larger belts are typically utilized when the PKM is being fired from a tripod, the tripod having mounts for the boxes. The rounds feed from the right and the spent brass ejects to the left. In practice, after firing 400 rounds in succession, the barrel is either changed out and replaced with another to give the removed barrel time to cool or the gunner ceases fire to permit the barrel to cool in place. Failure to do this risks bore wear.

     The PKM weighs a tad shy of 20 pounds which includes the detachable bipod but does not include the assault ammunition box. If a full assault box is attached, the weight increases by 8 or 7 pounds depending on if the box is the standard one or the lighter, aluminum version. Normally, aiming is done using iron sights but the PKM can be fitted with aiming optics using a side-rail bracket on the left side of the receiver. The more common optical sight used is the 1P29, a 4x magnification optic. The rear iron sight is a sliding tangent type with 100 meter increments starting at 100 meters up to 1,500 meters. The rear sight also has small side dials to adjust for windage.


Tuesday, February 18, 2025

Russo-Ukrainian War: M113AS4 Armored Logistics Vehicle (ALV)

Source: ArmyInform

     Australia, as part of the country's military aid to Ukraine, provided a total of 56 M113AS4 armored vehicles. While many are the M113AS4 armored personnel carriers (APCs), it is clear some of the delivered vehicles were variants of the M113AS4. One of them is clearly shown here and that is the M113AS4 ALV (Armored Logistics Vehicle), here in service with the 33rd. Mechanized Brigade. Behind the M113AS4 ALV is another M113AS4 though what model cannot be accurately determined. Because is lacks a turret, it is possible it is a M113AS4 AA (Armored Ambulance). A characteristic of the Australian M113AS4, which is a improved version of the M113AS1 and M113AS3 (that are themselves modifications of the U.S. Army's M113A1 APC), is the lengthened chassis that adds a sixth road wheel. The ALV variant appeared in 2007 and in total, 50 of them were built. 

     Power for the 18-ton ALV comes from a Daimler-Chrysler MTU 6V199TE diesel engine that develops 350 horsepower which is paired to a ZF LSG 1000 R transmission, 8-speed gearbox (6 forward, 2 reverse), and a FFG manufactured final drive. The ALV has a top road speed of 40 miles per hour and with a total of 95 gallons of fuel, the ALV has a maximum cruise range of 310 miles. On the standard M113AS4 as well as the M113AS4 AA, the fuel tanks are mounted externally on the back of the vehicle. These can be seen with the vehicle behind the ALV. However, with the ALV, the tanks are moved inside the hull. The ALV is not amphibious.

     The rear bed has the capacity to carry up to 5 tons of cargo or up to 20 soldiers can pile onto the bed though they would not benefit from any armor protection.

     This particular ALV is not fitted with any armament though the mount for a 12.7mm heavy machine-gun is seen in front of the open hatch. Usually, the weapon of choice is a Browning M2 fitted to the mount along with a small ACAV (Armored Cavalry Assault Vehicle) armored shield to offer the gunner a measure of protection from the front. As a standard, 2,000 rounds of ammunition is carried though this can be adjusted as needed. The only other armament would be any small arms the two man crew would have.

     For protection of the crew and any passengers, the hull of the ALV sports armor able to resist 14.5x114mm API (Armor-Piercing Incendiary) ammunition which means the ALV has STANAG 4569 Level IV defense. Against 155mm shell fragments, the armor is proof against them at a minimum distance of 25 meters. Finally, the vehicle can withstand anti-tank mines with up to 22 pounds of explosive payload. To improve the level of protection, there are appliqué ceramic armor panels fitted to the hull sides and front and internally, there are spall liners. The crew has added their own appliqué armor in the form of slat armor screens around the hull and portions of the roof as a measure of defense against HEAT munitions.

     Other ALV features include a radio system which complies with MIL-STD-461D (control of electromagnetic emission and susceptibility characteristics), 24V electrical system (which includes four SLABs [Sealed Lead Acid Batteries], twin caliper disk brakes with a dual hydraulic circuit, and a cooling system capable of operating in conditions as hot as 140 degrees Fahrenheit, and the ability to ford up to 5 feet of water without preparation.


Monday, February 17, 2025

Russo-Ukrainian War: Burned Out Russian "Loaf"

Source: Reddit

     No matter how many drone jammers a crew puts on their vehicle, it is no guarantee that any of them will succeed in stopping a drone attack. This is graphically illustrated here by this burned out Russian UAZ-452 series van. The crew had placed no less than four multi-channel drone jammers on each corner of the van's roof. That they were multi-channel can be told by each set having more than one antenna though the driver's side set has lost all of its antenna from the drone strike. We can see that the sets were at least 4-channel jammers, meaning, each antenna jammed a specific frequency (channel) that drones are known to operate on. The crew added a wire mesh cage which covered the front, a small portion of the sides of the van, and the portion of the roof over the front seats. Not that any of it prevented the Ukrainian drone (or drones) from successfully hitting the van.

     In part, this strike could be due to the Ukrainian FPV drone being capable of operating on multiple frequencies. If the drone detects its control signal is being degraded by an active jammer, it automatically switches to a different frequency. This is one reason both Russian and Ukrainian deployment of drone jammers on vehicles almost always incorporates more than one jammer in the hopes that a wider frequency range can be jammed. Another possibility is that the drone's video feed was jammed but the operator had already put the drone into its terminal flight path and simply kept the controls locked so that the drone still flew into the van.

     Speaking of the UAZ-452, it is a 4-wheel drive, off-road van which has been in production since 1965. Originally made for the Soviet military, the UAZ-452 can also be found in large numbers in civilian versions. The UAZ-452 is nicknamed the “Bukhanka” which means “Loaf” due to its shape that looks like a loaf of bread. Because the Russian logistical complex is unable to adequately provide units with military transport or even armored personnel carriers to replace losses, Russian troops have been using the UAZ-452 and its variants more and more as front-line transport and in some cases, as assault vehicles with disastrous consequences.

     It is probable the burned out remains is a UAZ-39625, one of the more recent versions of the original UAZ-452. It can seat 8 and the van is powered by a 2.7-liter petrol engine that develops 112 horsepower. This is paired to a manual transmission with a 5-speed gearbox and a 2-speed transfer case. On roads, the UAZ-39625 can reach a maximum of 79 miles per hour and 55 miles per hour, the van consumes 3.6 gallons of fuel every 62 miles. Total fuel capacity is 20 gallons.


Sunday, February 16, 2025

Russo-Ukrainian War: "Garpiya" 8-Channel Drone Jammer

Source: Krasnaya Zvezda

     With the inability of Russian logistics to adequately supply Russian Federation troops in the field with counter-drone equipment, it is not unusual that those troops who have the wherewithal purchase their own equipment off the civilian market or campaign via social media for donations either in funds for the unit to buy the gear or equipment is purchased by donors who then send it to the unit. Either way, the drone jammer seen here is one available on the Russian civilian market.

     Called the “Гарпия” ("Garpiya" meaning “Harpy”), the jammer can generate interference on eight drone channels via a 400 total watt output capacity. Each of the omidirectional antennas broadcasts the interference in a set band or the operator can elect to use a single directional panel antenna. The “Harpy” is offered in two versions, the difference being what frequencies the jammer operates against. The frequency in parenthesis is the primary frequency for that range. The first version targets drone control frequencies using 428 to 438MHz (433MHz), 860 to 930MHz (900MHz), 1,180 to 1,430MHz (1.2GHz), 1,380 to 1,430MHz (1.4GHz), 1,550 to 1,620MHz (1.5GHz), 2,400 to 2,500MHz (2.4GHz), 5,150 to 5,350MHz (5.2GHz), and 5,725 to 5,850MHz (5.8GHz). The second version targets frequencies between 300 to 400MHz (350MHz), 380 to 480MHz (459MHz), 500 to 650MHz (600MHz), 640 to 750MHz (700MHz), 750 to 920MHz (800MHz), 910 to 1,100MHz (1GHz), 2,390 to 2,500MHz (2.4GHz), and 5,720 to 5,860MHz (5.8MHz). The “Harpy” consumes 500 watts of power and it uses a 20 amp hour battery. This gives the “Harpy” approximately 8 hours of usage between battery changes or recharge.

     The pack weighs 35 pounds and the maximum range is 1.2 miles though this can be impacted by terrain and other conditions. If operating where mobile network signal is dense, the range of the “Harpy” is degraded. The “Harpy” does include anti-interference technology to combat electronic countermeasures (ECM). To keep the entire system cool, the pack incorporates heat sinks and cooling fans. Finally, the operator is provided with a remote control pad for the “Harpy”, tied into the unit via a cable. This permits the operator to use the “Harpy” without having to take it off his back.

     The weapon the soldier is using looks to be a TOZ-34 over-under shotgun. It does appear he is using 12-gauge shells, likely #00 buckshot.

Friday, February 14, 2025

Russo-Ukrainian War: DITA 155mm SPH

Source: Public Affairs, 12th. Special Operations Brigade

     The Netherlands has provided Ukraine with nine DITA 155mm self-propelled howitzers (SPHs) and this is one of them, in service with the Artillery Group, 12th. Special Operations Brigade “Azov”. The DITA (Digital Integrated Targeting Artillery), built by the Czech arms manufacturer Excalibur Army, entered production status in 2023 and it shares a high level of commonality with another Excalibur Army product, the DANA M2 152mm SPH. The key difference is the caliber of the howitzer. The DANA M2 uses a 152.4mm howitzer, a caliber that is mainly unique to artillery from the former Soviet Union, from former Warsaw Pact countries, and currently from the Russian Federation. The DITA, on the other hand, uses a 155mm howitzer which is the standard caliber across most NATO countries and thus is capable of firing any compatible 155mm projectile regardless of the country of manufacture. Both calibers still find widespread use in military forces around the world, to include Ukraine which fields self-propelled guns and towed artillery using both 152mm and 155mm calibers, the latter typically coming via military aid from NATO countries. In addition to the nine, the Netherlands has pledged to provide another six DITA. 

     The 29-ton DITA uses a Tatra 815 VP31M 8x8 wheeled truck chassis which uses a Tatra T3C-928-90 12-cylinder, air-cooled, turbocharged vee diesel engine that develops 408 horsepower that is mated to a Tatra Norgren 10-TS-210N semi-automatic transmission. The gearbox has 12 speeds: 10 forward, 2 reverse. This provides the DITA with a top road speed of 55 miles per hour and in optimum off-road conditions, the maximum speed is 15 miles per hour. Off-road performance is improved through a central tire inflation system (CTIS). Enough diesel fuel is carried to give the DITA a maximum cruise range of 372 miles.

     The main weapon is a 155mm L45 howitzer situated within a centrally mounted turret. The mount permits a maximum howitzer elevation of 70 degrees and 3 degrees of depression. The turret does not provide a full 360 degrees of traverse, offering only a total of 60 degrees of total traverse. The DITA has outriggers to stabilize the vehicle when firing from the halt with hydraulics that can quickly deploy and retract to enable the DITA to be ready for firing fast and move just as fast once the fire mission is complete. The DITA uses much the same electronics from the Czech company Retia that equips the DANA M2. In regards to the howitzer, the ASAP (Automatic Setting of Action Position) system permits the DITA to fully automate firing data calculations which in turn directs the turret to traverse and the gun mount to lay the howitzer at the optimum elevation to engage the target. The ASAP system also selects the appropriate ammunition from the 40 rounds carried in the DITA's 40-round automatic loader. Both the commander and the gunner are provided with a digital fire control system (FCS) that tie into the ASAP system. The DITA can be manually aimed using a ZZ-73 mechanical sight, a PG-1M-D panoramic telescope, a K-1 collimator, and a PAB-2A artillery compass. These are calibrated for the 155mm caliber. For manual direct fire, the gunner would use a OP-5-38D telescopic sight. With the automatic loader, the DITA can fire up to 6 rounds in the first minute with a sustained rate of 5 rounds per minute. It is known that some of the DITAs in Ukrainian service are firing the U.S. made M107 155mm HE (High-Explosive) projectile. The M107,which remains in production despite being introduced in 1959, has a weight of 95 pounds with a M739 fuze of which 14.6 pounds is Composite B explosive. Upon detonating, the M107 can produce almost 2,000 fragments. With a full powder charge, the M107 has a maximum range of 12 miles and if using a base bleed M107 variant, the range can be extended out to 20 miles. Of course, the 155mm L45 howitzer can fire RAP (Rocket Assisted Projectile) shells which can reach a maximum range of 24 miles. Unlike the DANA M2, the DITA is not fitted with a heavy machine-gun for anti-air or local defense. Instead, the DITA has to rely on any small arms carried by the crew.

     For armor, the cab is protected to STANAG 4569 Level 1 standard. This is proof up to 5.56x45mm and 7.62x51mm ball ammunition at 30 meters and against 155mm artillery shell fragments at 100 meters. Against explosives, the armor can protect against hand grenades and small artillery fragmentation submunitions. The turret is not armored as the howitzer can be operated from within the cab. The cab is also NBC (Nuclear Biological Chemical) protected and crew comfort provided by a heater and air-conditioning system. Speaking of crew, the DITA can be operated with as few as two men though three is the usual compliment.

     Other systems mounted on the DITA include 24 volt water-cooled auxiliary power unit (APU) paired to hydraulic pump which permits the vehicle's electrical systems to work and the pump allows the gun controls to function if the engine is turned off or broken down. If even the APU fails, the howitzer has manual controls which can be used to aim, load, and fire the howitzer. The driver is provided with a Retia digital diagnostics system to monitor critical systems as well as a video system to enhance situational awareness while driving. A Retia digital communications suite includes a C2I (Command, Control & Intelligence) function, VHF/UHF tactical radio station, and a intercom system for the crew. A Retia inertial navigation system is backed up by a GPS (Global Positioning System) and this is also tied into the ASAP system.


Wednesday, February 12, 2025

Russo-Ukrainian War: DANA M2 152mm SPG

Source: Ministry of Defence of Ukraine

     Belonging to one of the two self-propelled artillery battalions of the Artillery Group, 56th. Motorized Brigade “Mariupol” is this DANA M2 152mm self-propelled howitzer. Standing for Dělo Automobilní Nabíjené Automaticky (literally “gun on truck loaded automatically”), the DANA M2 is a Czech modernization of the Samohybná Kanónová Húfnica vzor 77 DANA (ShKH vz. 77 DANA; Self-propelled Howitzer Model 77) which entered service in 1981. The modernization is done by the Czech arms company Excalibur Army. Ukraine had purchased 30 DANA M2 vehicles and as of February 12, 2025, none have been lost in combat.

     The 30-ton DANA M2 uses a newer Tatra 815 8x8 wheeled truck chassis which uses the more powerful Tatra T3-930-52M 12-cylinder, air-cooled vee diesel engine that develops 355 horsepower that is mated to a Tatra Norgren semi-automatic transmission. This provides the DANA M2 with a top road speed of 55 miles per hour and in optimum off-road conditions, the maximum speed is 15 miles per hour. Off-road performance is improved through a central tire inflation system (CTIS). Enough diesel fuel is carried to give the DANA M2 a maximum cruise range of 372 miles.

     The main weapon is a 152.4mm howitzer situated within a centrally mounted turret. The mount permits a maximum howitzer elevation of 70 degrees and 4 degrees of depression. The turret does not provide a full 360 degrees of traverse, offering a maximum of 225 degrees of total traverse. Traverse is lesser if the howitzer is at full elevation, being limited to 45 degrees of total traverse. The DANA M2 has outriggers to stabilize the vehicle when firing from the halt with hydraulics that can quickly deploy and retract to enable the DANA M2 to be ready for firing fast and move just as fast once the fire mission is complete. Excalibur Army was not stingy in equipping the DANA M2 with electronics from the Czech company Retia. In regards to the howitzer, the ASAP (Automatic Setting of Action Position) system permits the DANA M2 to fully automate firing data calculations which in turn directs the turret to traverse and the gun mount to lay the howitzer at the optimum elevation to engage the target. The ASAP system also selects the appropriate ammunition from the 36 rounds carried in the DANA M2's 36-round automatic loader. A further 4 rounds plus charges are stored in the turret. Both the commander and the gunner are provided with a digital fire control system (FCS) that tie into the ASAP system. The DANA M2 can be manually aimed using a ZZ-73 mechanical sight, a PG-1M-D panoramic telescope, a K-1 collimator, and a PAB-2A artillery compass. For manual direct fire, the gunner would use a OP-5-38D telescopic sight. With the automatic loader, the DANA M2 can fire up to 5 rounds in the first minute with a sustained rate of 4 rounds per minute. Ukraine does utilize Czech ammunition and so the usual munitions are the 152-EOF HE (High-Explosive), DN1CZ HE-ER (High-Explosive Extended Range), and the 152-EPrSv HEAT (High-Explosive Anti-Tank) shells. The HE shell has a maximum range of 11 miles while the DN1CZ shell can attain a range of 16 miles. For direct fire using the HEAT round, the typical effective range is 1.2 miles. The DANA M2 is fitted with a 12.7mm NSVT heavy machine-gun for anti-air and local defense in addition to any small arms the crew may have.

     For armor, the cab is protected to STANAG 4569 Level 1 standard. This is proof up to 5.56x45mm and 7.62x51mm ball ammunition at 30 meters and against 155mm artillery shell fragments at 100 meters. Against explosives, the armor can protect against hand grenades and small artillery fragmentation submunitions. The turret is not armored as the howitzer can be operated from within the cab. The cab is also NBC (Nuclear Biological Chemical) protected and crew comfort provided by a heater and air-conditioning system. Speaking of crew, the DANA M2 can be operated with as few as two men though three is the usual compliment with room in the cab for 1 to 2 passengers.

     Other systems mounted on the DANA M2 include 24 volt auxiliary power unit (APU) paired to hydraulic pump which permits the vehicle's electrical systems to work and the pump allows the gun controls to function if the engine is turned off or broken down. The driver is provided with a Retia digital diagnostics system to monitor critical systems as well as a video system to enhance situational awareness while driving. A Retia digital communications suite includes a C2I (Command, Control & Intelligence) function, VHF/UHF tactical radio station, and a intercom system for the crew. A Retia inertial navigation system is backed up by a GPS (Global Positioning System) and this is also tied into the ASAP system.


Tuesday, February 11, 2025

Russo-Ukrainian War: The Repkon Defence RDS-40 AGL

Source: Ministry of Defense of Ukraine

     A soldier of the 95th. Air Assault Brigade “Polesia” operating a Repkon Defence RDS-40 40mm automatic grenade launcher (AGL). Another unit known to use the RDS-40 is the 3rd. Assault Brigade. It remains unknown exactly where the grenade launchers were sourced nor how many are in service. Turkey, the country Repkon is based in, has not reported such a transfer nor has the Ukrainian Army reported receiving the weapons from Turkey. Thus, it is thought they were purchased or obtained by another country and distributed to Ukraine as part of a military aid package.

     If the RDS-40 looks familiar, that is because it is a variant of the U.S. Army's Mk.19 40mm AGL. The Mk.19 is currently built under license in Turkey by MKE (Makine ve Kimya Endüstrisi; Mechanical & Chemical Industry Corp.) and information is scant on if Repkon Defence has picked up the license or if MKE has contracted with Repkon for a modernized version. As Repkon's name can be found on the RDS-40, the former might be the case. Repkon utilizes flow forming in its metal manufacturing. In simple terms, flow forming involves using rollers to shape a metal preform against a mandrel (a support for the preform as it is shaped by the rollers). The end result is the ability to manufacture seamless components to minimize the need for welding with the components benefiting from a higher tensile strength at a lower weight as well as mitigating variance in thickness in the components.

     Differences in the RDS-40 compared to the Mk.19 is the usage of flow forming manufacturing to reduce the number of components needed to construct the weapon. According to TurDef Global Defence News, the rear sight of the Mk.19 was redesigned so as to produce it with fewer parts but what other aspects of the Mk.19 were reworked to take advantage of Repkon's manufacturing process hasn't been stated. Another change noted by TurDef is a redesign of the feed mechanism to lessen the chance of jams or other ammunition related stoppages. Finally, the spade grips and trigger have been ergonomically shaped to improve handling and firing.

     How much the RDS-40 weighs in comparison to the 73 pounds of the MKE built Mk.19 isn't specified. The cradle and tripod (21 and 44 pounds respectively) are the same as the Mk.19 as is the performance. The RDS-40 is fed either by a 32- or 48-round belt of 40x53mm grenades, held in an ammunition can on the left side of the weapon. Based on the coloration of the grenades in the photograph, it appears the operator is firing the M430A1 HEDP (High-Explosive Dual Purpose) grenade. This means the grenade can be fired against soft and hard targets. The grenade is armed after traveling at least 18 meters upon firing and has an effective range of 1,500 meters (.9 of a mile) though the RDS-40 can fling the M430A1 out to 1.5 miles. The M430A1's Composition A5 explosive payload has a kill radius of 16 feet with a wound radius of 50 feet. Armor penetration is 76mm of standard steel (not rolled homogenous armor as used on tanks) which makes the RDS-40 a threat to light armored vehicles. The M430A1 uses a M549A1 fuze and M55 detonator. The RDS-40 has a cyclic rate of fire of 325 to 375 rounds per minute but the more practical is the sustained rate of 40 rounds per minute. The RDS-40 uses iron sights but the RDS-40s in use by the 3rd. Assault Brigade are fitted with a panoramic sight to permit more accurate indirect fire.

     Of interest is the paint brush the operator has tucked onto the front of his plate carrier vest.


Monday, February 10, 2025

Russo-Ukrainian War: The DOK-ING MV-4

Source: ArmyInform

     In August 2023, the Estonian Rescue Association (Päästeliit) donated a single DOK-ING MV-4 demining vehicle to Ukraine along with other equipment such as metal detectors to help civil Ukrainian sappers in locating and destroying Russian mines. DOK-ING, a Croatian company, specializes in remote controlled vehicles and was founded in 1992. The MV-4, shown here, is one of two mine clearing vehicles the company offers with the other being the larger MV-10. As of January 2024, Ukraine had fourteen MV-4 vehicles in service.

     Power for the 6-ton (base weight) MV-4 comes from a Perkins 1106 C-E70 TA 6-cylinder, water-cooled, turbocharged diesel engine. The motor produces 250 horsepower but the MV-4 is not built for speed. Maximum speed is 4 miles per hour and for this reason, the MV-4 is transported to the work area by a trailer truck. During demining operations, the speed varies based on the conditions but ranges from as slow as .3 miles per hour to a little under 1 mile per hour. Fuel capacity is 18 gallons of fuel though fuel consumption depends on what the MV-4 is being used for and the terrain it is working on. As such, the consumption can be as little as 1.8 gallons per hour up to 6.6 gallons per hour.

     The MV-4 can be fitted with an array of mine clearing equipment but here, a segmented roller is being used. The apparatus consists of 12 individual rollers whose weight causes mines to detonate when the roller passes over them. The clearing width is 6.8 feet. The reason for having multiple rollers is that when a roller (or rollers) is damaged by a mine, it can be easily (and less expensively) replaced rather than having to replace the entire roller had it been a single roller drum (such as those found on steam rollers).

     Other demining apparatus include a flail and a tiller. The flail consists of a rotating drum to which are attached 34 chains ending in metal balls. As the flail spins at 900 revolutions per mine, the ends of the chains strike the ground and upon hitting a mine, cause the mine to detonate. Like the rollers, damaged chains can be individually replaced. The flail can clear a path 5.9 feet wide and trigger mines buried up to 11 inches deep.  The tiller, like a garden tiller, churns up the ground and will either unearth buried mines or detonate them. Like the flail, the tiller clears a 5.9 foot wide path but can reach down to 1.1 feet. Mines not detonated but exposed are dealt with by sappers.

     Being remote controlled, the operator can be just under 1 mile away from the MV-4 though this is the maximum and assumes an unblocked line of sight to the vehicle. Atop the MV-4 is the fully controllable camera system which includes low-light capable cameras, a infrared light, and regular lights to give the operator the best view possible. Other cameras are located on the hull to further provide views during operation. One of them can be seen in the photograph, just under the side light.

     To provide a measure of protection, the entire hull is built using Hardox® 450 steel produced by SSAB (Svenskt Stål AB) with thickness ranging from 6mm to 20mm. This protects the engine and other critical systems from mine blasts and low caliber small arms.

     The MV-4 is used by the Russian Federation as the Uran-6 and the U.S. Army deploys the MV-4 as the M160.

Saturday, February 8, 2025

Russo-Ukrainian War: Tula TOZ-34 Shotgun

Source: Reuters

     The case can be made, and successfully, that the wide-scale usage of drones in the Russo-Ukrainian War has changed the modern battlefield. The Ukrainians have totally embraced drones as they have a low production cost, can be produced in relatively large numbers, and in many cases, the monetary cost of what they destroy far outweighs the money and materials that went into the drone. Ukraine makes use of drones in the air, on sea, and on land. In fact, Ukrainian naval drones have pretty much turned Russia's Black Sea Fleet into a useless entity as what ships remain have to operate at ranges that exceed their ability to provide any meaningful support to ground units. Of course, Russia is also making heavy use of aerial drones, to include the deadly ZALA Lancet loitering munition. As such, like Russian troops, Ukrainian troops have to be constantly aware of any drone activity and this photograph illustrates that.

     Often, Ukrainian front-line troops are supplied not by large military logistical trucks but much smaller vehicles such as civilian pick-up trucks. The crews of these supply vehicles are always on the watch for enemy drones and rely on reports from other units in the area of drone activity. Also, they take steps to protect themselves and on the roof of the cab of the pick-up are at least two drone jammer domes. This allows the crew to jam more than one frequency though it is a near constant issue of frequencies being changed to mitigate jamming and the jammers having their frequency spectrum changed to allow them to jam the latest drone frequencies being used. Jammers are not fool-proof and so while two of the crew work to unload supplies, the third crewman keeps his eyes skyward. A weapon of choice to combat drones is the shotgun and here, the soldier looks to have a Tula TOZ-34 over-under shotgun.

     The TOZ-34 first appeared in 1964 and is one of the most prolific and popular civilian hunting weapons made by the Russian Tula Arms Plant (TOZ; founded in 1712) with over 1 million having been built. The 7 pound shotgun is typically chambered for 12 gauge shells but it was also produced in 20, 28, and 32 gauge at one time or another. The TOZ-34 uses a break action and the rate of fire depends on how skilled and quick the firer is with reloading. The TOZ-34 only has iron sights but later variants had provisioning for optical sights. 

     As the typical 12 gauge shotgun has an effective range of around 150 feet, it means a very close fight with a drone. The operator relies on the spread of the buckshot to inflict damage on the drone though at maximum range, the spread pattern is such that a hit is a 50 percent prospect. As such, to increase the odds of downing a drone, the operator would engage at 75 feet or less. At such close quarters, there may be no second chances if the drone is not destroyed with one or two shots from the TOZ-34. This is because there may be no time to reload.


Thursday, February 6, 2025

Russo-Ukrainian War: Ukrainian Triple-Mount RPK-74

Source: Global Images Ukraine.

     One of the main components of Russia's aerial raids against Ukrainian infrastructure (power plants, factories, electrical distribution centers, etc.) and civilian targets is the Geran-2, the Russian version of the Iranian HESA Shahed 136 loitering munition. The Geran-2 is relatively cheap at a single unit cost of no more than $80,000 for the current model. As such, they can be launched enmasse (and  usually in combination with other weapons, such as cruise missiles) in order to overwhelm Ukrainian defenses and ensure successful strikes. A component of Ukrainian air defense comprises rapid response anti-drone units which, upon receiving the flight paths for Russian drones, deploy in or near the flight paths to engage them with an array of light, medium, and heavy machine-guns mounted on trucks. Given the 115 miles per hour top speed of a Geran-2, utilizing machine-guns to shoot down the drones is a viable (and cost effective) method. In some cases, static anti-drone defenses are set up around valuable targets or as a secondary layer of defense against any drones which get through the mobile anti-drone units as illustrated here. One of the techniques to increase the chances of a successful hit against drones is to simply throw as many bullets as possible into the path of the drone and hope one or more of the rounds strike the drone to such a degree as to down it. And so this anti-drone mount holds three RPK-74 light machine-guns.

     Introduced into Soviet Army service in 1974, the RPK-74 is chambered for the Soviet 5.45x39mm round and all three of the RPK-74 weapons are secured to a metal frame which permits a high degree of elevation (very useful for anti-air duties) which in turn is fitted to a heavy tripod. To the right of the central RPK-74 is a shoulder stock which the gunner can use to stabilize the mount, assist in absorbing recoil, and guide the mount when traversing and elevating. Below the shoulder stock is a trigger which permits the gunner to fire all three RPK-74s at the same time. Between the center and outer right RPK-74 is a ring sight and given the electrical cord, it is possible that a night sight or a spotlight is connected to the gun mount to aid the gunner in acquiring his target. The basket, though empty, is likely for keeping additional magazines to speed reloading. Speaking of magazines, the RPK-74 can utilize either a 30- or 45-round box magazine.

     Using a gas operated, rotating closed bolt action, the RPK-74 is capable of firing up to 600 rounds per minute. Assuming the 45-round magazine, a single RPK-74 can empty the magazine in 3.5 seconds. So, with three RPK-74 weapons firing in unison, this means the gunner can send 135 rounds towards the target in those same 3.5 seconds. With a muzzle velocity of 3,149 feet per second, the 5.45x39mm round has an effective range of .6 of a mile (1,000 meters) if using saturation fire. The bullet itself can travel as far as 2 miles but accuracy is about nil at such a distance. Given the short effective range, this particular anti-drone weapon arrangement relies on the Geran-2 to be flying at low altitude (it can fly as low as 197 feet) and close to the gun emplacement for a realistic chance of the gunner being successful in his engagement. Otherwise, it really does become a “fill the sky with lead” in the direction of the drone and hope to get a very lucky hit. Fortunately, some Geran-2 do fly at low altitudes to make detection more difficult and to lower the window of time the defenders have to engage before the drones move out of range or lines of sight get blocked by terrain and terrain features.

Wednesday, February 5, 2025

Russo-Ukrainian War: Russian T-80BVN, Central Military District

Source: Evgeny Biyatov, Sputnik Media Bank

     A Russian T-80BVN belonging to a unit within the Central Military District, operating somewhere near Avdiivka, Donetsk Oblast on September 28, 2024. One of five such military districts in Russia, a good number of its subordinate units have been deployed to Ukraine. This includes elements from the 2nd. and 41st. Guards Combined Arms Army and the 25th. Combined Arms Army.

     The crew of this particular T-80BVN have added a sizable anti-drone cage to the turret, portions of which overhang the front and rear hull. The camouflage netting obscures much of what comprises the cage though through the gap, one can see lengths of chain hanging down. These have become a common method for anti-drone defenses as the chains, with their weight, have the capability of breaking the rotors and/or rotor pylons of FPV drones. The cage uses fencing elsewhere with the chains forming a portion of the cage that allows the commander and gunner to enter and exit the tank. Shorter lengths of chain hang down from the bottom edges of the front facing portion of the cage (visible in another photograph of the same tank).

     Along the sides of the tank is a long strip of rubberized material (most often conveyor belts) which is a simple form of appliqué armor which provides a small measure of protection to the turret ring. The T-80BVM does have rear mounted slat armor as standard but here, the crew has added more slat armor panels and it appears that they have created a raised anti-drone cover over the engine deck but the camouflage netting covers much of it. Barely visible are rubber panels, with heavy netting, secured to the edges of the turret's front mounted Relikt explosive reactive armor panels.

Monday, February 3, 2025

Russo-Ukrainian War: Knocked Out Russian BTR-82A

Source: Reddit.

     A knocked out Russian BTR-82A IFV (Infantry Fighting Vehicle), photographed sometime in the late spring or early summer of 2024. Of note is the Kontakt-1 explosive reactive armor (ERA) blocks placed as best possible on the turret, hull front, and sides of the vehicle. ERA is not something the BTR-82A is normally fitted with, hence the haphazard placement. The crew also added slat armor, a single (and scorched) panel seen on the right side and another just visible on the left side near the driver's hatch. Despite all the added defense, it did not stop the BTR-82A from being put out of action. The BTR-82A is an improved version of the similar looking BTR-80A and it first appeared to the public as a prototype in 2009. By 2013, the Russian Ministry of Defense officially accepted the BTR-82A for service.

     Power for the 16-ton 8x8 wheeled BTR-82A comes from a KamAZ-740.14-300 diesel engine that develops 300 horsepower and is paired to a fixed-ratio, manual transmission. This permits the BTR-82A to obtain a top road speed of 50 miles per hour. Off-road, the speed is lower though cross-country performance is assisted by a central tire inflation system (CTIS) and heavy duty shock absorbers. The BTR-82A is amphibious and can achieve a top water speed of 6 miles per hour in calm water. Rear-mounted water jet provides propulsion. Enough fuel is carried to permit a maximum cruise range of 435 miles.

     The primary armament is a 30mm 2A72 automatic cannon mounted in a unmanned turret. The 2A72 uses a dual-feed and typically has a combination of AP-T (Armor-Piercing Tracer) and HE-I (High-Explosive Incendiary) ammunition to permit the gunner to engage different target types. Total ammunition capacity for the cannon is 300 rounds. The HE-I ammunition has an effective range of 1.2 miles (and against slow, low-flying aircraft,  2.5 miles) while the AP-T ammunition can defeat up to 25mm of armor at a 60 degree slope from a maximum range of .6 of a mile. Fitted co-axially is a 7.62mm PKTM machine-gun which is provided with 2,000 rounds. The weapons are fitted to a 2-plane, electro-mechanical stabilizer with the turret providing 360 degrees of traverse while the gun mount offers 70 degrees of elevation and 5 degrees of depression. Traverse speed of the turret is up to 6 degrees per second. The gunner is provided with a TKN-4GA-01 day/night sight and FCS (Fire Control System) which permits engagement from the halt or on the move. The commander is provided with a TKN-AI surveillance camera, that includes a laser rangefinder, for locating targets out to a maximum range of 1.9 miles. On each side of the BTR-82A's hull are three firing ports for the crew and/or passengers to utilize their small arms.

     The BTR-82A has improved laminate armor over the BTR-80A's hardened steel but what thickness (or equivalent) it has isn't fully known. It is very likely on par with STANAG 4569 Level III armor protection which means it can defeat up to 7.62x54Rmm API (Armor-Piercing Incendiary) ammunition at 30 meters and 155mm shell fragments at 60 meters. As for mines, it can protect the vehicle's occupants from mines with up to 18 pounds of explosive. Additional protection to the crew of  three (commander, driver, and gunner) and passengers (up to 7 infantrymen) is provided by interior spall liners and a reinforced, multi-layer floor along with blast resistant seats. Finally, an automatic fire suppression system equips the BTR-82A as well as a 902V Tucha 81mm smoke grenade launcher system with six launchers mounted on the turret front. 

     Other equipment includes a R-168-25-U2 digital radio system with encryption, Trona-1 topographic orientation system (which taps into independent satellites for navigational data) to enhance the vehicle's navigation system which uses the Russian GLONASS global positioning system (and can also use the NavStar GPS), APU (Auxiliary Power Unit) to permit the BTR-82A to function with the engine off, heating/air-conditioning system, bilge pump, and a NBC system (using over-pressure).