Alvis Stalwart FV620, 6×6 Amphibious Military Truck “The Stolly” #559
A rare collectors item.
The Alvis Stalwart FV620, informally known by servicemen as the ‘Stolly’, is a a true 6-wheel-drive highly mobile amphibious military truck built by Alvis that served with the British Army from 1966 until the 1980s.
The hull is the vehicle chassis, the engine is situated under the load deck in the rear of the hull and the gearboxes, differentials and transfer boxes forward of this.
The load deck is open-topped with large drop down panels on either side.
Waterproof seals ensured that these would not leak when in the water.
The three man cab has the driver’s position in the centre and a seat for a passenger either side.
The cab is entered through watertight roof hatches.
The Alvis Stalwart FV620 could carry 5 tonnes of stores, or tow 10 tonnes.
In the water it can be driven at about 6 knots by vectored thrust steering water-jet propulsion units.
The all-wheel drive system has multiple gearboxes, and the water propulsion units, is extremely well engineered.
When the amphibious qualities become unnecessary, it is common for the water jets to be removed to reduce weight and maintenance.
This example is fitted with its water-jet propulsion units.
The Stalwart’s impressive over-terrain capabilities came from the fact that the 6-wheel-drive system lacked differentials, using simple bevel gears to transmit drive.
A centre mounted no-spin differential allows a certain amount of slip between the two sets of wheels on each side of the vehicle on hard surfaces, but there was no allowance for rotational speed differences between front and rear. The centre no-spin unit allows the wheels on either side of the vehicle with most grip to drive when off-road. This had the effect of making the vehicle appear to crab (move from side to side) when negotiating muddy conditions, thus making the Stalwart a true 6-wheel-drive vehicle, with 3 wheels locked together and turning at the same speed.
Alvis Stalwart FV620 Specifications:
Weight 9 tonnes
Length 6.36 m
Width 2.62 m
Height 2.31 m
Crew driver + 2 passengers
Engine: Rolls Royce B81 MK 8B eight-cylinder water-cooled 6.5 l petrol,
Suspension 6 x 6 wheels
Operational range 640 km
Mk2 engine fitted around 1979-80
Previous owner 30 years
V5 registered & documentation present & correct. HPI clear. Clear title.
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