The BGT1 (British Government tender Type 1), also known as the 40-50hp or on the civilian market the 30 cwt Subsidy Chassis, was produced in 1923 in response to the British War Office's Subsidy Specification No 30 which called for a "30 cwt chassis capable of carrying at least 2 tons over rough country". At first the 5266 cc 30/70 engine was used but the smaller 25/30 engine could be specified. The 30/70 engine was an over bored version of the 25/30. The last ones were probably made in 1927.
It was available in both civilian and military specifications, the civilian version having a fabricated radiator surround and the military a cast aluminium version. At least one was fitted with a Kegresse track bogie and used in 1925 as a demonstrator. The military version was supplied to the British and Indian governments and the Royal Air Force.
The engine used was either the 4531 cc 25/30 type or the 5266 cc 30/70 type.
Chassis numbers were in either the 30xxx range for those fitted with the 25/30 engine or the 50xxx range for the 30-70 engined variants.
Around 200 are believed to have been made, none are known to survive.
The 30 cwt civilian version of the 40-50 with lorry body from the Crossley Motors Sales Brochure
The BGT1 military model. This example was fitted with a Kegresse track and was acting as Crossley's demonstration vehicle in trials at Bovington camp in 1925.
In chassis form the BGT1 cost £850 or £890 with electric lighting and starting and complete vehicles cost from £950. It was eligible for a government subsidy of £40 per year if made available for military use on demand.
|capacity||4531 cc or 5266 cc|
|cylinders||Four, cast in pairs|
|bore||4 inches (101.6 mm) or 4 5/16 inches (109.5 mm)|
|stroke||5½ inches (140 mm)|
|RAC horsepower||25.6 or 29.8|
|lubrication||pressure fed to bearings|
|carburettor||Smiths 4 jet|
|max power||30-50 bhp or 50-70 bhp depending on specification.|
|fuel consumption (typical)||
|max speed (approx)||50 mph (80 kph)|
|Gears|| Gearbox separate from engine and linked by double flexible
overall ratios: 34:1, 20.5:1, 11.75:1, 6.25:1. Reverse 27.494:1
|Final Drive||worm drive 6.25 ratio.|
|Clutch||Inverted cone type with Ferodo lining. Clutch stop.|
|Axle|| Front - beam axle
Rear - steel casing with fully floating drive shafts
|length||11 feet 8 inches (3556 mm)|
|track|| 4 feet 9 inches (1448 mm)
|steering||worm and full wheel.|
|suspension - front||semi elliptic springs|
|suspension - rear||semi elliptic springs|
|brakes|| Foot operated contracting transmission brake.
Hand operated rear expanding type. cast iron lined.
|wheels/tyres|| Rudge Whitworth type spoked wheels.
Tyres - 36 x 6 inches front, 38 x 7 inches rear
|fuel capacity||Rear tank containing 15 gallons (68 litres). Dash tank with 5.5
gallons (25 litres).
Feed from rear tank by Autovac, dash tank by gravity. Level gauge on rear tank.
|Lighting||One Acetylene head lamp on right hand side, two side lights, one
Electric lighting optional