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. 

Chassis numbers were in the 25xxx range. At least one car and a Martel one man tank was built on the chassis.

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. Here the worm drive rear axle can be seen and the substantial cross member. The engine bulkhead arrangements and the radiator are also changed. The gearbox is of the right hand change type.
	The car built on the 15/20 chassis. The reason for the production of this possibly unique car is not known.

Engine/gearbox/transmission

Body/chassis

capacity 2388 cc cylinders monobloc bore 3 1/8 inches (79.4 mm) stroke 4 3/4 inches (120 mm) compression ratio : RAC Horse Power 15.6 valves side ignition Magneto 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 Military - 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) weight cwt (chassis) steering Worm and complete wheel suspension - front half elliptic springs suspension -rear underslung half elliptic springs brakes 4 wheel brakes with front using the Perrot system. The hand brake operates on separate shoes on rear axle. wheels/tyres Pressed steel artillery type. 32 x 4 1/2 inch tyres.

© Malcolm Asquith 2007