The 14hp engine was used in a range of commercial and military vehicles introduced in 1925. Originally the wheelbase was 10 feet 5 inches but the military versions were supplied as 9 feet or 12 feet 11 inches. From 1927 the civilian versions were shortened to 9 feet.
The chassis was also used for staff cars for the Indian Army.
Chassis numbers were in the 25xxx range. At least one Martel one man tank was built on thechassis.
The total number made is not known but over 50 ambulances were sold. There are no known survivors.
15/20 Motor Ambulance as shown in the Crossley brochure of 1926.
The body was ash framed with the interior paneled in mahogany faced plywood.
There was room for two stretchers in the rear.
15hp 15/20 cwt van from the 1925 brochure.
The frame is described as of hardwood with plywood panels, coach painted and varnished.
The interior dimensions are 7 ft 2 in long, 5ft wide and 4 ft 2 in high.
The chassis used on the commercial vehicles differs from that used on the cars especially at the rear.The engine bulkhead arrangements and the radiator are also changed. The gearbox is of the right hand change type.
Here the worm drive rear axle can be seen and the substantial cross member.
The staff car built on the 15/20 chassis. An unknown number of these were supplied to the Indian Army. Fold down occasional seats were fitted behind the front seat.
|bore||3 1/8 inches (79.4 mm)|
|stroke||4 3/4 inches (120 mm)|
|RAC Horse Power||15.6|
|max power||32 bhp at 2400 rpm|
|fuel consumption (typical)||
|lubrication||pressure fed to main and big end bearings|
|max speed (approx)||not known|
|Gears|| 4 speed in unit with engine
van - 3.73:1, 2.32:1, 1.47:1, 1:1
ambulance - 5.83:1, 2.32:1, 1.47:1, 1:1
The Military version had a 4+2 gear box with high and low ratios giving 8 forward speeds.
|Clutch||single dry plate|
|Drive Shaft||open shaft with fabric universal joints.|
|Rear axle|| worm drive with worm on top
ratio - 6.5:1
|wheelbase|| Civilian -
10 ft 5 in (3175 mm)
9 ft 0 in (2743 mm) from 1927
9 ft 0 in (2743 mm)
12 ft 11 in (3937 mm)
|length||14 ft 7 1/8 in (4448 mm) - 19ft 5 in wheelbase models|
|width overall||5 feet 6 3/4 in(1695 mm)|
|track||4 ft 8 in (1422 mm)|
|steering||Worm and complete wheel|
|suspension - front||half elliptic springs|
|suspension - rear||underslung half elliptic springs|
|brakes||4 wheel brakes with the front using the Perrot system. The hand brake operates on separate shoes on the rear axle.|
|wheels/tyres||Pressed steel artillery type. 32 x 4 1/2 inch tyres.|