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The OT-810 series of vehicles was a Czechoslovak post-war production of modified Sd.Kfz. 251 half-tracks. In Czechoslovakia, these vehicles were designated Hkl 6p and Hkl 7, mostly referred to as Hakl. The first OT-810 prototypes were produced in 1954 and had different armor layout and engine from the production variants. One of these prototypes was equipped with the vz.38/46, which is a Czechoslovak production variant of 12,7mm DShK machine gun.
The OT-810 was specifically designed to transport infantry, with one of its main modifications being armored roof hatches over the troop compartment at the rear of the vehicle. The OT-810D was a modification introduced in mid-1966, when Czechoslovakia was looking a new tank destroyer capable of engaging the most modern threats of the time, such as M60 pattons and more, while also being able to engage infantry. The OT-810D project was reffered to as Úkol BEZOT, which is name for the first prototype of this vehicle, that is a simple 82mm BzK vz.59 recoiless rifle on slightly modified OT-810, later prototype mounting the gun in more similar way of fighting compartment to the OT-810D.
To improve accuracy, the gun was paired with a 12,7 mm ZH-59 spotting rifle. The trajectory of the spotting rounds closely matched the recoilless gun, allowing the crew to correct aim before firing the main weapon.
The crew was made up of four crew members, this being driver, gunner, loader and commander.
Armament
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82mm BzK vz.59A (A - Lighter variant of vz.59)
- Open: -10° degrees of depresion, +25° degrees of elevation
- Enclosed: - ~6° degrees of depression, +25 degrees of elevation.
- Traverse
- Open - 120°
- Enclosed - ~10°
- Munition
- 82-JPrSv-BzK 59 - HEAT
- Velocity: 745 m/s
- Shell weight: 4,75 kg
- Penetration - 30° RHA - 220mm
- 82-JOF-BzK 59 - HE-FRAG
- Velocity: 565 m/s
- Shell weight: 4,72
- 82-JPrSv-BzK 59 - HEAT
- 82-JO-BzK 59 - HE
- Velocity: 565 m/s
- Shell weight: 4,72
- Ammunition count: 30
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12,7mm ZH 59 spotting rifle
- 150 rounds of munition
Mobility
- Engine: 119hp Tatra T-928-3
- Transmission: Manual 4+1
- Top speed of 60 kph
- Weight: 9,250 kg
Armour
- Hull
- Front - 15mm
- Side - 8-12mm
- Back - 8-12mm
- Bottom - 6mm
Dimensions
- Lenght: 5575mm
- Height: 2500mm
- Width: 2190mm
Pictures
Fighting compartment layout
Detachment and attachment of 82mm BzK vz. 59 manual
ZH-59 close-up
Captured Sd.Kfz.251/9 ausf.C later put into service with 1st Tank Brigade of Czechoslovak Army.
Captured Sd.Kfz.251
Captured Sd.Kfz.250
OT-810 dressed up as Sd.Kfz. 251/16 and Sd.Kfz 251/22
Prototypes of OT-810D
Úkol BEZOT No.1 prototype
Úkol BEZOT No.2 prototype
Sources
VHU.SK 82mm vz.59
VHU.CZ 82mm BzK vz.59
Valka.cz - 82mm BzK vz59
Valka.cz - vz.59
Valka.cz - OT-810D
VHU.SK ZH-59
Obrněný transportér OT-810 - historie, takticko-technické, data, modifikace - Jiří Frýba
Tatra club - OT-810
Československé bezzákluzové zbraně - Jan Haas