General Dynamics DURO 6x6
The DURO is a family of modular 4x4 and 6x6 vehicles, designed as a tactical army vehicle. It was first sold by Bucher-Guyer AG, later by MOWAG and now by General Dynamics.
Table of contents
- Engine and gearbox
- DURO III
- DURO IIIP
The name DURO stands for DUrable and RObust. The Swiss firm Bucher-Guyer AG developed this vehicle. In 1994, the Swiss army ordered the first batch of 3000 vehicles.
MOWAG (also a Swiss firm) acquired the right in 2002. It launched the DURO III in 2004. Later on, MOWAG was taken over by General Dynamics. Now it is now part of General Dynamics European Land Systems. (GDELS)
Over the years, the design of the DURO evolved. The DURO III does share its chassis and driveline with the Eagle V from General Dynamics European Land Systems.
Engine and gearbox
The vehicle does use a Cummins diesel engine. The first generations of the DURO did use the 5.9 L ISBe 6-cylinder turbo diesel. Later generations use the 6.7 L 6-cylinder ISBe engine. An engine which is produced in Europe (Italy)
Some sources say the first DURO vehicles did have a VM diesel engine. It was not possible to find verification for this information.
The gearbox is an Allison 5-speed automatic gearbox.
A 2-speed transfer case is mounted in front of the second axle.
De Dion tube axles are used on the DURO. This axle design consists of a solid axle and a separate differential, which is mounted on the frame of the vehicle. Propshafts connect the differential to the wheels. The disc brakes are mounted on the differentials. One benefit of the de Dion tube is the increased ground clearance underneath the axles, as there is no differential housing in the axles.
The vehicle does have TORSEN self-locking differential, including in the inter-axle differentials. It is not clear if these TORSEN differentials have been used in all vehicle generations.
The vehicle does have coil springs on all axles, assisted by a Watt linkage. (for axle location)
The DURO does have a patented stability system which allows the two first axles to flex in opposite directions. When both axles flex in the same direction, it acts as a stabiliser. This system consists of 2 large U-shaped axle location bars, which have 3 mounting points. 2 on the axles and one centre on the frame. These bars are interconnected by 2 small stabilisers. These stabilisers prevent the axle location bars to move when the vehicle tilts to one side. So, the location bars become a spring which supports the vehicle.
- central tyre inflation system
- air conditioning
- preheat unit
- NBC overpressure system
This updated version of the DURO was first sold in 2004. It is designed by MOWAG and is the basis for the vehicles sold today.
The DURO IIIP is the armoured version of the DURO III. This vehicle is only available on a 6x6 chassis.
Rheinmetall Landsysteme builds an armoured body for this vehicle. At least for the vehicles sold to the German army.
The Yak an updated version of the DURO IIIP. It is designed to fix some issues of the DURO IIIP, which did emerge during the ISAF mission in Afghanistan.
The chassis of the Yak is upgraded to better handle the extra weight of the armour.
The cab is higher than the one of a DURO IIIP.
At this moment is the German army the only user of this vehicle. The German army does several of variants of the Yak, for different applications.
Some of DURO IIIP vehicles have been upgraded to the Yak specification.
- Germany (Bundeswehr)
- The UK
Duro II 6x6
- Engine: Cummins ISBe 250, 5.9 L, 6-cylinder turbo diesel, 250 hp / 184 kW
- Gearbox: Allison S 2000, 5-speed automatic gearbox
- 2-speed transfer case
- air over hydraulics disk brakes, ABS
- top speed in high range: 100 km/h
- top speeed in low range: 60 km/h
- Wheelbase: 3530 mm and 1200 mm (1-2 and 2-3)
- Length: 6700 mm
- Width: 2160 mm
- Height: 2650 mm
- Clearance under the axles: 400 mm
- Unladen Weight: 5700kg
- GVM: 8,600kg
- GCM: 12,100kg
- Maximum permissible front axle load: 3,500kg
- Maximum permissible 2nd axle load: 3,600kg
- Maximum permissible rear axle load: 2,600kg
- fuel tank: 160 litres
- Approach angle: 45 deg.
- Departure angle: 47 deg
- Gradient: 60 %
DURO III 6x6
- first vehicles: Cummins ISBe 250, 5.9 L, 6-cylinder turbo diesel, 250 hp / 184 kW
- later vehicles: Cummins ISBe 6.7 L, 6-cylinder turbo diesel, 245 hp
- Gearbox: Allison 2500 SP, 5-speed automatic gearbox
- tyres: 335/80R20 (Duro IIIP)
- Payload: Up to 6500 kg
The DURO IIIP (left) and the Yak (right) in service at the German army. (Picture credits German army (Bundeswehr))
The DURO de Dion tube. On top the differential and the disk brakes.
The axle location on the DURO