Tatra T-912 (vzduchom chladený radový vznetový 6-valec objemu 7.412 cm3)
Tatra T-912 (6 cyl., diesel, air-cooled, 7.412 ccm)
Výkon: Power:
70 kW při 2100 ot/min
93.9 bhp at 2100 rpm
Převodové ústrojí: Transmission:
mechanická, 4+R, normálny a redukovaný chod
mechanical, 4 forward and 1 reverse gears, normal or reduced drive mode
Výkony: Performance:
Rychlost na silnici: Road Speed:
62,5 km/h
39 mph
Rychlost v terénu: Cross-country Speed:
11,6 km/h
7 mph
Jízdní dosah po silnici: Cruising Range on Road:
500 km
311 mi
Jízdní dosah v terénu: Cross-country Cruising Range:
? km
? mi
Překonávání překážek: Obstacles Crossing:
Svah: Gradient:
30 °
67 %
Boční náklon: Side Slope:
? °
? %
Překročivost: Trench Crossing:
1,2 m
47 in
Výstupnost: Vertical Obstacle:
? m
?
Brodivost: Fording Depth:
0,8 m
31 in
Výzbroj: Armament:
Osobné zbrane posádky
Personal weapons crew
Uživatelské státy: User States:
-
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Poznámka: Note:
-
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Zdroje: Sources:
Martin Dubánek, Ivo Pejčoch - Obrněný transportér Praga V3S-O, časopis HPM č.8/2007, ISSN: 1210-1427
URL : https://www.valka.cz/CZK-Praga-V3S-O-1-t64358#624687
Version : 0
In 11/1953, at a meeting of representatives of the Tank Mechanized Troops Command, the Military Technical Institute, and other branches of the Army, an analysis of the problems of armored personnel carriers was conducted. The possibilities of filling the numbers of units, whose needs were still lagging behind the tabulated numbers, were discussed. Also, the requirement for new modern transporters was not met. The needs of the army were still met by captured German World War II Sd.Kfz.251 armored personnel carriers. Although the HAKO project (the future OT-810) was started, early deliveries of production machines could not be expected due to constant changes in requirements. Experts from the VTU were forward thinking and recommended the development of more agile and especially amphibious tracked transporters. However, this would have further delayed development and delayed serial production. The threat of a potential conflict with the Western powers forced army officials to start the development of a new type of armoured personnel carrier on the platform of the newly developed Praga V3S truck. It was a kind of backup emergency project. Optimistic assumptions were that the prototype would be built and tested in 1954, with production starting in 1/1956. Despite these efforts, however, there was hardly any work on this vehicle project in 1954-55. It was only after General Kratochvil's rebuke of 8/11/1955 that the work was set in motion and the required specifications were determined.
The following specifications were required: maximum height: 2000 mm width: 3320 mm clearance: 400 mm maximum speed: 75-80 km/h specific tyre pressure: 1.8 kg/cm2 off-road load capacity: 1900 kg with a crew of 20 soldiers + driver and vehicle commander ability to tow a trailer up to 3000 kg ability to withstand infantry weapons fire (8, 10 and 15 mm armour)
The development was to be derived from the Praga V3S or Tatra 111. Working prototypes were to be delivered by 3/1956. The entry was approved on 17/12/1955 by the Minister of National Defence Gen. JUDr. Alexey Čepička. Subsequently, development work got underway. The paradox was that even a pair of designs by two competing firms was created. Under the index V3S-O-1, a prototype of the vehicle was made by the employees of Repair Plants Přelouč (registration number 535001). Under the index V3S-O-2 a prototype was made by the technicians of the Prague Automobile Works of Klement Gotwald (Praga) (registration number 530077). These were two quite different vehicles. The reasons why, in the time, financial and capacity constraints, it was decided to develop them twice are not known. The main task of the vehicles was to transport two rifle squads. Another requirement was the ability to tow guns of 85 mm calibre (vz.52). The V3S-O program used the Praga V3S platform with 6x6 drive. The platform was to be top-mounted with an open armoured hull, resembling the Sd.Kfz.251 hull in concept. Propulsion was to be provided by a Tatra T-912 diesel engine, the same as found in standard Praga V3S trucks. An interesting design feature was the addition of a fourth wheel between the front axle and the two rear ones. The wheel was not powered, but was pivoting and was intended to make it easier to negotiate off-road undulations and obstacles. The prototype from Přelouč had a folding wheel, the Prague prototype had a fixed wheel. The V3S-O-2 had a shortened chassis. The performances of the prototypes were almost identical. The crew consisted of the driver and his helper. Two machine gun squads were carried, with a total of 11 soldiers (a platoon leader, two squad leaders and eight soldiers). If the transporter was used to tow an 85 mm gun vz.52, the crew consisted of another seven men (the commander and six gunnery sergeants) in addition to the driver's helper. Ten boxes of ammunition for the gun were carried in the vehicle. In the event of the transporter being used by engineer troops, the crew also consisted of 11 men, but they were equipped with a pair of small rubber boats, two mine finders, three 70 metre ropes, ten shovels and ten picks, 20 cork lifebuoys, a saw, two axes, a tracer line, demarcation pins, 10 kg of wire, 20 plates and two sticks. Consideration was also given to using the V3S-O in the role of an anti-tank squad transporter with a tarmac gun. In this case, it was required to solve small modifications for mounting the weapon and ammunition. The main comparative tests between the two prototypes were carried out at the 104th Mechanized Regiment in Jince between 7 August 1956 and 25 August 1956. The prototype of the HAKO half-track transporter (OT-810) also took part in the tests. The HAKO prototype (OT-810) clearly excelled in the field tests. The V3S-O prototypes excelled in capacity capabilities. They had a larger combat compartment where more material could be loaded, more soldiers. The V3S-O-2 handled heavy machine gun fire better than its competitor, the V3S-O-1. It had a swivel console mounted on it, which allowed it to fire while driving. The V3S-O-1 could only fire when the vehicle was stopped. During the trials, the V3S-O-1 prototype covered a total of 984 km on roads and 179 km off-road, the V3S-O-2 prototype covered 608 km on roads and 115 km off-road. Both prototypes of the V3S-O program had a heavy competitor in HAKO (OT-810), which also won the competition for a new armored personnel carrier. Wheeled transporters were not fully suited for combat in the conditions of the time. The Commission proposed to develop a new type of wheeled and tracked transporter, both of which were to be seaworthy. Pending its development and mass production, the HAKO (OT-810) was to be produced. The V3S-O program has been discontinued, the fate of the prototypes is unknown.
Martin Dubánek, Ivo Pejčoch - Obrněný transportér Praga V3S-O, HPM magazine No.8/2007, ISSN: 1210-1427 photo VHA
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Zľava: prototyp HAKO (OT-810), v strede V3S-O-2, V3S-O-1.
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Zľava: V3S-O-1, V3S-O-2, HAKO (OT-810)
URL : https://www.valka.cz/CZK-Praga-V3S-O-1-t64358#624685
Version : 0
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