AP2782 - Group 3

BC = Bogie Centres. GC = Ground Clearance. MPG = Miles per gallon. TC = Turning Circle. WB = Wheelbase.

RAF (Stores) Ref Nos were not given in this document but where they are shown, they have been assumed from later versions of AP2782. This edition also did not include photos so these have been added from AP2782A. When a vehicle appears in more than one edition of AP2782, the technical details have been assembled from all available data.

'Tructors' - General information

There were basically standard Ford models incorporating the following main modifications: -

Shorter wheelbase, by cutting a section out of the frame ahead of the front rear spring bracket.
Fitment of Warford 2-speed auxiliary gearbox.
Fitment of vacuum tank and single line vacuum brake connection. Trailer brakes controlled by valve fitted to foot brake.
Open truck type body with hinged tailboard.
RAF drawbar gear.
Tail lamp adapted to take RAF trailer connection.
(On Reynolds Tructor) Fitment of larger petrol tank, capacity 30 gallons, between cab and body

For details of individual models see below: -

Tractor, petrol, heavy wheeled, Allan Taylor Tructor, (Thames Conversion)
Manufacturer	Ford
RAF Ref No	Unknown
Engine	Ford, V8, petrol. Bore: 3.06 in, Stroke: 3.75 in, Capacity: 3.62 litres (220.18 cu in). Max BHP - 85 at 3,800 rpm; Max torque - 1,800 lbs/ins at 2,000 rpm. RAC Rating - 30.01 hp
Transmission	Clutch - Ford, Single dry plate Gearbox - 4 speed and 1 reverse. Ratios: 1st - 6.4 to 1, 2nd - 3.09 to 1, 3rd - 1.69 to 1, 4th - 1 to 1, reverse - 7.82 to 1: Auxiliary box - Warford, 2-speed. Ratios 1 to 1 and 2.01 to 1. Front axle - 'I' beam Rear axle - Full-floating, spiral bevel, ratio 6.67 to 1: Overall ratios (High) - 42.65 to 1, 20.61 to 1, 11.24 to 1, 6.67 to 1, Reverse - 52.13 to 1. Overall ratios (Low) - 85.72 to 1, 41.42 to 1, 22.59 to 1, 13.41 to 1, Reverse - 104.72 to 1.
Performance	Max Speed - not stated; MPG - 12 (solo), 7 (towing); Radius of Action - not stated
Dimensions	Length - not stated (internal - 6 ft 3 in); Width - not stated (internal - 6 ft 7½ in); Height - not stated (internal - 1 ft 11 in); WB - 8 ft 3 in; G/C - 9 in (rear axle); TC - 35 ft; Track - 5 ft 3-7/16 in (front), 5 ft 8 in (rear)
Weights	Unladen - 2 tons 8¾ cwt; Laden - 4 tons 2¾ cwt.
Body	Body - See general note above. Cab - All enclosed seating two, including driver.
Suspension	Semi elliptical, front and rear.
Brakes	Foot and hand, internal expanding, mechanical on all wheels. Trailer brakes - see note above.
Wheels/Tyres	Two-piece/34 x 7 singles on front, dual on rear.
Notes	Steering - ¾ irreversible 'hour glass' worm and sector, 17 to 1 ratio. Electrical equipment - 6V. Also shown in AP2782A, Section 14.

Tractor, petrol, heavy wheeled, Reynolds Tructor, (WOT 3 Conversion)
Manufacturer	Ford
RAF Ref No	Unknown
Engine	Ford, V8, petrol. Bore: 3.06 in, Stroke: 3.75 in, Capacity: 3.62 litres (220.18 cu in). Max BHP - 85 at 3,800 rpm; Max torque - 1,800 lbs/ins at 2,000 rpm. RAC Rating - 30.01 hp
Transmission	Clutch - Ford, Single dry plate Gearbox - 4 speed and 1 reverse. Ratios: 1st - 6.4 to 1, 2nd - 3.09 to 1, 3rd - 1.69 to 1, 4th - 1 to 1, reverse - 7.82 to 1: Auxiliary box - Warford, 2-speed. Ratios 1 to 1 and 2.01 to 1. Front axle - 'I' beam Rear axle - Full-floating, spiral bevel, ratio 6.67 to 1: Overall ratios (High) - 42.65 to 1, 20.61 to 1, 11.24 to 1, 6.67 to 1, Reverse - 52.13 to 1. Overall ratios (Low) - 85.72 to 1, 41.42 to 1, 22.59 to 1, 13.41 to 1, Reverse - 104.72 to 1.
Performance	Max Speed - not stated; MPG - 10 (solo), 6.5 (towing); Radius of Action - not stated
Dimensions	Length - 14 ft 6 in (internal - 4 ft 10 in); Width - 7 ft 1 in (internal - 6 ft 8 in); Height - 7 ft 2 in (internal - 1 ft 11 in); WB - 8 ft 9 in; G/C - 9½ in (rear axle), 11 in (belly); TC - 48 ft; Track - 5 ft 9¼ in (front), 5 ft 5¼ in (rear)
Weights	Unladen - 2 tons 11 cwt; Laden - 4 tons 4 cwt.
Body	Body - See general note above. Cab - All enclosed seating two, including driver.
Suspension	Semi elliptical, front and rear.
Brakes	Foot and hand, internal expanding, mechanical on all wheels. Trailer brakes - see note above.
Wheels/Tyres	Divided disc type, 6.00 x 16/, 8 stud/10.50-16 singles all round, HD on front, Cross-Country on rear.
Notes	Steering - ¾ irreversible 'hour glass' worm and sector, 17 to 1 ratio. Electrical equipment - 6V. Also shown in AP2782A, Section 14.

Tractor, petrol, heavy wheeled, Allan Taylor Tructor, (WOT 3 Conversion)
Manufacturer	Ford
RAF Ref No	Unknown
Engine	Ford, V8, petrol. Bore: 3.06 in, Stroke: 3.75 in, Capacity: 3.62 litres (220.18 cu in). Max BHP - 85 at 3,800 rpm; Max torque - 1,800 lbs/ins at 2,000 rpm. RAC Rating - 30.01 hp
Transmission	Clutch - Ford, Single dry plate Gearbox - 4 speed and 1 reverse. Ratios: 1st - 6.4 to 1, 2nd - 3.09 to 1, 3rd - 1.69 to 1, 4th - 1 to 1, reverse - 7.82 to 1: Auxiliary box - Warford, 2-speed. Ratios 1 to 1 and 2.01 to 1. Front axle - 'I' beam Rear axle - Full-floating, spiral bevel, ratio 6.67 to 1: Overall ratios (High) - 42.65 to 1, 20.61 to 1, 11.24 to 1, 6.67 to 1, Reverse - 52.13 to 1. Overall ratios (Low) - 85.72 to 1, 41.42 to 1, 22.59 to 1, 13.41 to 1, Reverse - 104.72 to 1.
Performance	Max Speed - not stated; MPG - 10 (solo), 6.5 (towing); Radius of Action - not stated
Dimensions	Length - 14 ft 6 in (internal - 4 ft 10 in); Width - 7 ft 1 in (internal - 6 ft 8 in); Height - 7 ft 2 in (internal - 1 ft 11 in); WB - 8 ft 9 in; G/C - 9½ in (rear axle), 11 in (belly); TC - 48 ft; Track - 5 ft 9¼ in (front), 5 ft 5¼ in (rear)
Weights	Unladen - 2 tons 7¾ cwt; Laden - 4 tons 0¾ cwt.
Body	Body - See general note above. Cab - All enclosed seating two, including driver.
Suspension	Semi elliptical, front and rear.
Brakes	Foot and hand, internal expanding, mechanical on all wheels. Trailer brakes - see note above.
Wheels/Tyres	Divided disc type, 6.00 x 16/, 8 stud/10.50-16 singles all round, HD on front, Cross-Country on rear.
Notes	Steering - ¾ irreversible 'hour glass' worm and sector, 17 to 1 ratio. Electrical equipment - 6V. Also shown in AP2782A, Section 14.

Tractor, extra heavy, wheeled, FWD SU (Petrol), 4x4
Manufacturer	FWD
RAF Ref No	Unknown
Engine	Waukesha type SRKR, 6 cyl, petrol. Bore: 117.5 mm (4.265 in), Stroke: 130.2 mm (5.125 in), Capacity: 8.47 litres (517 cu in). Compression ration - 5.5 to 1; Max BHP - 126 at 2,250 rpm; Max torque - 4,416 lbs/ins at 600 rpm. RAC Rating - 51.3 hp
Transmission	Clutch - Single plate, 14 in dia. Gearbox - FWD Model 'U' with provision for PTO, 5 speed and 1 reverse. Ratios: 1st - 9.91 to 1, 2nd - 5.83 to 1, 3rd - 3.15 to 1, 4th - 1.85 to 1, 5th - 1 to 1, reverse - 8.95 to 1: Transfer box - FWD Model 'S', chain driven from main gearbox, incorporated differential and differential locking gear. The differential lock is to be used in emergency only. Ratio - 2.06 to 1. Front axle - Full-floating, bevel, ratio 4.31 to 1: Rear axle - Full-floating, bevel, ratio 4.31 to 1: Overall ratios - 88.25 to 1, 51.7 to 1, 27.9 to 1, 16.4 to 1, 8.87 to 1, Reverse - 79.4 to 1.
Performance	Max Speed - not stated; MPG - 10 (solo), 6.5 (towing); Radius of Action - not stated
Dimensions	Length - 22 ft 6 in (internal - 14 ft 6 in); Width - 7 ft 9 in (internal - 7 ft 0 in); Height - 10 ft 9 in (internal - 6 ft 0 in); WB - 12 ft 0 in; G/C - 1 ft 2 in (both axles); TC - 62 ft; Track - 6 ft 0 in (front & rear)
Weights	Unladen - 6 tons 10¼ cwt; Laden - 11 tons 17 cwt; Max permissible load: Road - 5 tons 7 cwt, Cross-country - 4 tons 9¼ cwt; Max towed load - 7 tons 2¾ cwt.
Body	Body - GS load carrying body fitted with detachable hoops and canvas tilt. Cab - All enclosed, all weather type of wood and steel construction, flexible 3 point mounting, Forward control seating two. Winch (if fitted) - Gar Wood Model 4 MB, mounted in rear of cab and driven through chain and 34.1 to 1 ration worm and wheel from PTO at main gearbox. The winch carries 300 ft of ¾ in diameter cable. The drive is transmitted from the chain sprocket to the worm shaft through a shear pin which is designed to transmit power only within the limits of the predetermined capacity of the winch and so to prevent overloading of the PTO and the chassis frame. A band brake is fitted on the drum flange for controlling light loads, an automatic brake on the worm shaft prevents the load from over-running the worm gearing when the PTO is in neutral or after the shear pin has failed. Towing facilities - Front - towing hooks, Rear - pintle hook.
Suspension	Semi elliptical, front and rear with auxiliary overload spring on rear assembly
Brakes	Foot - internal expanding, hydraulic with compressed air servo on all wheels. Hand - mechanical on transmission. Trailer brakes - vacuum system with hand and foot control valves.
Wheels/Tyres	Divided disc type, 10.00 x 20/, 10 stud/14.00-20 singles all round.
Notes	Steering - Ross semi-reversible cam and twin lever type, right hand mounting. Electrical equipment - 12V with vibrating type voltage regulator. Also shown in AP2782A, Section 14.

Tractor, extra heavy, wheeled, AEC Matador 0853, 4x4 Crown Copyright^©
Manufacturer	AEC
RAF Ref No	Unknown
Engine	AEC type A187, CI, 6 cyl. Bore: 105 mm (4.134 in), Stroke: 145 mm (5.749 in), Capacity: 7.58 litres (462.6 cu in). Compression ration - 16 to 1; Max BHP - 95 at 1,800 rpm (governed); Max torque - 3.720 lbs/ins at 1,200 rpm. RAC Rating - 41 hp.
Transmission	Clutch - Single plate Gearbox - 4 speed and 1 reverse. Ratios: 1st - 4.38 to 1, 2nd - 2.69 to 1, 3rd - 1.59 to 1, 4th - 1 to 1, reverse - 5.33 to 1: Auxiliary box - 2-speed. Ratios 1 to 1 and 2.3 to 1. The drive is transmitted from the auxiliary gearbox either (i) to the rear axle only for normal road work or (ii) to the front and rear axles for cross-country operation. The auxiliary gearbox also provides for a reduction of 2.31 to 1 to meet severe operating contions when in four-wheel drive. Front and rear axle - Full-floating, spiral bevel and double helical gears, ratio 7.9 to 1. The drive is transmitted from the front steering axle by 'Tracta' or 'Rzeppa' constant velocity joints. Overall ratios (High) - 34.6 to 1, 21.25 to 1, 12.56 to 1, 7.9 to 1, Reverse - 42.1 to 1. Overall ratios (Low) - 79.9 to 1, 49.1 to 1, 29.0 to 1, 18.25 to 1, Reverse - 97.3 to 1.
Performance	Max Speed - 32 mph (governed); MPG - 9; Radius of Action - 360 miles
Dimensions	Length - 20 ft 9-3/8 in (internal - 13 ft 1½ in); Width - 8 ft 0 in (internal - 7 ft 8 in); Height - 9 ft 7 in (stripped shipping height - 6 ft 4 in); WB - 12 ft 7½ in; G/C - 13 in (front axle), 15¼ in (rear axle), 18½ in (belly); TC - 60 ft; Track - 6 ft 3-1/8 in (front), 5 ft 10¾ in (rear)
Weights	Unladen - 7 tons 5 cwt; Laden - 11 tons 5 cwt (4 tons ballast).
Body	Body - Flat platform body. Front bulkhead - 1 ft 4 in high. Fixed side sills or chock rails 2½ in high. Hinged tailboard at rear, 4 in high. Battery box 1 ft 7 in by 2 ft 9 in carried at forward end of the body. Laminated spring drawbar gear with fork and pin fitted at front and rear. Cab - All enclosed forward control type cab, seating two. Detachable top to reduce shipping height. Special Fitments - 7 ton 'Turner' winch (early models only had a 3 ton winch) driven by PTO from auxiliary gearbox. A hand operated band brake is fitted to control the load. A safety device, connected to the fuel injection pump control lever stops the engine when the pull on the cable approached the limit (according to type). The winch carries 250 ft of ¾ in diameter rope. Mean cable speeds at 1,000 rpm engine speed with auxiliary gearbox ratio of 2.31 to 1: - 1st speed - 54 ft per minute 2nd speed - 88 ft per minute
Suspension	Semi elliptical, front and rear.
Brakes	Early models: Foot - Air pressure assisted Lockheed hydraulic system on all wheels. Later models: Foot - Air pressure brake gear. Air pressure holding the brake shoes off until the foot pedal is activated when the air pressure escapes to atmosphere and applies the internal expanding shoes. All models: Hand - mechanical linkage to internal expanding shoes on rear wheels. Trailer brake connection - Three type fitted - Twin air pressure couplings to allow towing of trailers with air pressure operated brakes. Air pressure brake cylinder for operating mechanical brakes. Warner electric brake coupling socket for connection to trailers equipped with Warner electrical brakes.
Wheels/Tyres	Divided disc type, 10 stud/13.50-20 low pressure singles all round.
Notes	Steering - Marles cam and lever type. Electrical equipment - Lighting and auxiliaries - 12V, Dynamo and Starter - 24V CAV or Simms equipment Also shown in AP2782A, Section 14.

Tractor, Petrol, heavy wheeled, Crossley, 4x4 Crown Copyright^©
Manufacturer	Crossley
RAF Ref No	Possibly 16A/747 (Type 1); 16A/749 (Type 3)
Engine	Crossley, 4 cyl, petrol, OHV. Bore: 110mm (4.31 in), Stroke: 140 mm (5.5 in), Capacity: 5.266 litres (321.35 cu in). Max BHP - 90 at 2,500 rpm, (governed to 2,500); Max torque - 2,770 lbs/ins at 1,500 rpm. Compression ration - 6 to 1; RAC Rating - 29.8 hp
Transmission	Clutch - Single dry plate Gearbox (Main) - 4 speed and 1 reverse, Crash type. Ratios: 1st - 5.34 to 1, 2nd - 2.985 to 1, 3rd - 1.71 to 1, 4th - 1 to 1, reverse - 4.7 to 1: Auxiliary Box - 2 speed. Ratios - (High) 1 to 1 and (Low) 2.12 to 1. Short shaft with fabric type flexible couplings between clutch and main gearbox. Two drive shafts from auxiliary gearbox to front and rear axles fitted with Mechanics needle roller bearing universal joints. Front axle - Overhead worm gear, 7.75 to 1. Torque transmission to hubs through 'Tracta' constant velocity joints. Rear axle - Overhead worm gear, 7.75 to 1. Full-floating axle shafts. Lockable differential Overall ratios (High) - 41.38 to 1, 23.13 to 1, 13.25 to 1, 7.75 to 1, Reverse - 36.49 to 1. Overall ratios (Low) - 87.72 to 1, 49.03 to 1, 28.09 to 1, 16.43 to 1, Reverse - 77.37 to 1.
Performance	Max Speed - 35 mph; MPG - 5 (towing trailer loaded to 10 tons gross weight); Radius of Action - 170 miles
Dimensions	Length - 14 ft 10 in; Width - 7 ft 6 in; Height - 8 ft 5 in; WB - 8 ft 6 in; G/C - 11 in; TC - 45 ft; Track - 6 ft 6 in (front), 5 ft 5 in (rear)
Weights	Unladen - 4 tons 3¾ cwt; Laden - 6 tons 0¾ cwt.
Body	Body - Folding steel-panelled box for the reception of ballast to assist road holding when towing normal trailers. Box must be folded to its stowed position when towing Tasker semi-trailers. Cab - Fully enclosed steel panelled cab seating two, including driver. Towing fittings: - Front - towing loops for vehicle recovery only. Rear - towing hook with spring loaded catch mounted on laminated spring drawbar. Standard pattern Tasker ramp and trailer coupling mounted on chassis frame and accessible when ballast box in in stowed position.
Suspension	Semi elliptical, longitudinally mounted, front and rear
Brakes	Foot - Girling internal expanding, hydraulically (Lockheed) operated with Clayton Dewandre vacuum servo assistance on all wheels. Hand brake - mechanical on all wheels. Trailer brake connections - At rear only - Single line vacuum system fitted with both Brockhouse and quick -detachable type couplings..
Wheels/Tyres	4-piece 10 stud/10.50-20 or 11.00-20 cross-country
Notes	Steering - 'Bishop' Cam and lever. Also shown in AP2782A, Section 14. Type 3 was fitted with a Delco-Remy coil ignition instead of Simms Magneto ignition.

Bedford, 4x2, Model OXC tractor
Manufacturer	Bedford
RAF Ref No	Possibly 16A/686
Engine	Bedford M, 6 cyl, petrol, OHV. Bore: 85.7mm (3-375 in), Stroke: 101.6mm (4 in), Capacity: 3.5 litres (214.7 cu in), Max BHP - 72 at 3,000 rpm (governed to 2,580 rpm, later to 3,000 rpm); Max torque - 1,932 lbs/ins at 1,200 rpm. Compression ration - 6.22 to 1. RAC Rating - 27.34 hp
Transmission	Clutch - Single dry plate 10 in dia. Gearbox - 4 speed and 1 reverse. Ratios: 1st - 7.22 to 1, 2nd - 3.47 to 1, 3rd - 1.71 to 1, 4th - 1 to 1, reverse - 7.15 to 1: Front axle - Reversed Elliott type. Rear axle - Full-floating, spiral bevel, ratio 7.4 to 1: Overall ratios - 53.42 to 1, 25.67 to 1, 12.65 to 1, 7.4 to 1, Reverse - 52.91 to 1.
Performance	Max Speed - not stated; MPG - 7; Radius of Action - 110 miles
Dimensions	Length - 14 ft 6-3/8 in; Width - 6 ft 7-7/8 in; Height - 7 ft 1 in; WB - 9 ft 3 in; G/C - 9 in (rear axle); TC - 48 ft; Track - 5 ft 3 in (front), 5 ft 2½ in (rear)
Weights	Gross Train when coupled to articulated trailer - 9 tons.
Body	Body - Two variants were available to tow Scammell and Tasker semi-trailers - see details below. Cab - All enclosed with detachable top to reduce shipping height. Drop windows in doors, V-fronted windscreen, hip ring assembly on left hand side of roof.
Suspension	Semi elliptical, front and rear with hydraulic shock absorbers all round.
Brakes	Foot, hydraulic operating on all wheels of tractor and mechanically with vacuum servo assistance on trailer brakes when coupled. Hand brake - mechanical on rear wheels. A separate hand lever operates the trailer brakes. Trailer connections - Single line vacuum.
Wheels/Tyres	WD Pattern two-piece/32-6 HD with twin rear on early models, 10.50-16 cross-country singles on later models.
Notes	Steering - Worm and wheel. Also shown in AP2782A, Section 14.
Scammell For coupling to any Scammell articulated trailer fitted Scammell articulated coupling gear and is interchangeable with Scammell Mechanical Horse MH6 only. The following are the main modifications to the basic Bedford OXC chassis: - Fitment of Scammell automatic coupling gear. To couple, reverse the tractor onto the trailer so that the latter rides up the ramps and engages the securing hooks. To uncouple apply trailer brakes, operate uncoupling lever in cab and drive away. Braking modified as follows - Footbrake operates hydraulic brakes on all 4 wheels on tractor and operates mechanically with vacuum servo assistance on the trailer brakes. Vacuum tank gauge fitted to tractor for servo assisting mechanical trailer brakes which are automatically connected up on coupling tractor and trailer. There are two hand brake levers, one operates rear wheels on tractor, the other operates the trailer brakes. One 16 gallon petrol tank. Spare wheel carried behind cab. Rear axle ratio - 7.4 to 1
Tasker For coupling to Tasker articulated trailers and can be used as an alternative to the Commer Q tractor. The following are the main modifications to the basic Bedford OXC chassis: - Lowering and re-positioning of the two 12 gallon petrol tanks. Reduced frame overhang. Fitment of vacuum tank for trailer brake, single line trailer coupling and vacuum gauge in cab. Fitment of Tasker ramp to couple up to Tasker articulated trailers. Rear axle ratio - 7.4 to 1.

Tractor, Wheeled, Semi Trailer, 4x2, Commer Q2 Crown Copyright^©
Manufacturer	Commer
RAF Ref No	Unknown
Engine	Commer, 6 cyl, petrol. Bore: 85mm (3.35 in), Stroke: 120mm (4.72 in), Capacity: 4.0857 litres (249.23 cu in). Compression ratio - 5.6 to 1. Max BHP - 80 at governed speed of 3,100 rpm; Max torque - 2.120 lbs/ins at 1,200 rpm. RAC Rating - 26.85 hp.
Transmission	Clutch - Borg and Beck, Single dry plate 11 in dia. Gearbox - 4 speed and 1 reverse. Silent helical constant mesh; dog engagement top and 3rd gears; sliding , first and second gears. Ratios: 1st - 6.414 to 1, 2nd - 3.366 to 1, 3rd - 1.788 to 1, 4th - 1 to 1, reverse - 8.246 to 1: Front axle - Reversed Elliott Rear axle - Full-floating, spiral bevel, ratio - 6.57 to 1. Overall ratios - 42.14 to 1, 22.114 to 1, 11.747 to 1, 6.57 to 1, Reverse - 54.18 to 1.
Performance	Max Speed - not stated; MPG - 7 (coupled to trailer, gross trailer weight - 9 tons); Radius of Action - 140 miles
Dimensions	Length - 12 ft 10 in; Width - 6 ft 6 in; Height - 2 ft 3 in (frame); WB - 8 ft 0 in; G/C - 9 in (rear axle - laden); TC - 39 ft (Left), 42 ft (Right); Track - 5 ft 4 in (front), 5 ft 3¾ in (rear)
Weights	Unladen - 1 tons 15¼ cwt; Laden - not stated
Body
Suspension	Semi elliptical, front and rear
Brakes	'Cowdrey' balanced, internal expanding. Foot, hydraulic on all wheels. The fluid pressure is also utilised to operate the reaction valve controlling the vacuum used for applying the trailer brakes Hand brake - mechanical on rear wheels.
Wheels/Tyres	2 piece split disc type 6.00 x 16/10.5-16 singles (earlier vehicles were fitted with 10.50-20)
Notes	For towing Tasker semi-trailers, the appropriate ramp and coupling gear being fitted. Steering - Cam and roller type. Also shown in AP2782A, Section 14.

Tractor, Scammell Mechanical Horse MH6 3, 3x2 Crown Copyright^©
Manufacturer	Scammell
RAF Ref No	16A/1474
Engine	Scammell, 4 cyl, in-line, water-cooled, petrol, side valve. Bore: 87.31 mm (3.44 in), Stroke: 87.31 mm (3.44 in), Capacity: 2.09 litres. Max BHP - 45 at 3,200 rpm; Max torque - not stated. RAC Rating - 18.9 hp.
Transmission	Clutch - Borg and Beck, Single dry plate 9 in dia. Type A-6 Gearbox - 4 speed and 1 reverse. Spur gear; sliding mesh and dog engagement: rear axle driving pinion is is integral with main shaft: magnetic oil filter in drain plug. Ratios: 1st - 6.3 to 1, 2nd - 3.01 to 1, 3rd - 1.69 to 1, 4th - 1 to 1, reverse - 8.4 to 1: Front axle - Off-set caster; cranked axle operates hydraulically damped coil spring suspension gear in caster leg. Rear axle - Double reduction; bevel and spur gear drive to four pinioned differential; fully-floating axle shafts and taper roller hub bearings. Ratio - 11.23 to 1 (combined bevel and spur) Overall ratios - 71 to 1, 33.8 to 1, 19 to 1, 11.23 to 1, Reverse - 94.3 to 1.
Performance	Max Speed - not stated; MPG - not stated; Radius of Action - not stated
Dimensions	Tractor only - Length - 14 ft 3½ in; Width - 6 ft 3 in; Height - 6 ft 7 in; WB - 9 ft 6 in: Tractor with MH6s/15P10 trailer - Length 24 ft; Width - 7 ft 2 in; TC - 20 ft.
Weights	Tractor only - Unladen - 1 tons 11 cwt; Laden - not stated
Body	Cab - Pressed steel construction, full depth doors, seats for driver and passenger. Coupling Gear - Scammell design with two ramps, fitted to rear of tractor frame., which take flanged wheels of trailer undercarriage; two spring-and-rubber buffers absorb coupling shock and load the coupling hooks to keep trailer secure. Trailer release lever fitted, with sfety catch, in cab.
Suspension	Front - coil spring; Rear - Longitudinal semi-elliptical leaf springs
Brakes	Foot - applies Girling rear wheel brakes mechanically and also operates trailer brakes which are applied by servo vacuum unit. Hand brake -operates rear wheel brakes, separate lever in cab for trailer brakes.
Wheels/Tyres	Front - 5.00x10 divided; central nave 6.531 in bore, 8 stud/8.25-10 8-ply Rear - 6.00x13 divided; central nave 8.701 in bore, 8 stud/10.50-13 10-ply
Notes	Mechanical Horse for drawing Scammell, 6 ton, 2-wheeled semi-trailer type MH6S/15P10. Also shown in AP2782A, Section 14.

Scammell, 3x2, MH3 tractor Crown Copyright^©
RAF Ref No	not stated
Engine	Scammell, 4 cyl, petrol, side valve. Bore: 63.5 mm (2.5 in), Stroke: 88.9 mm (3.5 in), Capacity: 1.126 litres. Compression ration - 5 to 1; Max BHP - 21 at 3,000 rpm; Max torque - not stated. RAC Rating - 9.9 hp.
Transmission	Clutch - Single dry plate Gearbox - 4 speed and 1 reverse. Ratios: 1st - 6.17 to 1, 2nd - 3.02 to 1, 3rd - 1.75 to 1, 4th - 1 to 1, reverse - 8.19 to 1: Rear axle - ¾-floating, double reduction, spiral bevel drive. Ratio - 11.28 to 1* Overall ratios - 63.43 to 1, 31.05 to 1, 17.99 to 1, 10.28 to 1, Reverse - 84.19 to 1. *This ratio is provided for tractors hauling standard 3 ton loads. Alternative ratios are available, as follows, for MH3tractors operating under other conditions:- 9.25 to 1 - MH6/3 Tractor unit 12.33 to 1 - Tractors operating with special loads of 4 tons , or in hilly districts. 14.51 to 1 - For use with 3/6 ton carrier (6 ton load)
Performance	Max Speed - not stated; MPG - not stated; Radius of Action - not stated
Dimensions	Tractor only - Length - not stated; Width - not stated; Height - not stated; WB - 8 ft 0¾ in; TC - 17 ft 6 in; Track (rear wheels) - 4 ft 2 in: Tractor with 13 ft trailer - TC - 23 ft 6 in.
Weights	Tractor only - Unladen - 1 tons 11 cwt; Laden - not stated
Body	Cab - all enclosed, window in rear bulkhead. Coupling Gear - Scammell design with two ramps, fitted to rear of tractor frame, shaped to take the flanged wheels fitted to the transverse oscillating beam on the trailer undercarriage. Two adjustable spring-cum-rubber buffers take up the impact when coupling and provide loading on the coupling hooks to keep the trailer securely locked to the tractor.
Suspension	Front - coil spring; Rear - semi-elliptical leaf springs
Brakes	Foot and hand - mechanical operating on rear wheels. A separate hand lever operates an emergency transmission brake. Trailer connection - Hand lever in cab operates trailer brakes through a king pin on trailer turntable.
Wheels/Tyres	Two-piece/8.25-10
Notes	Mechanical Horse for drawing Scammell, 3 ton capacity semi-trailers. Steering - The vertically-mounted front fork is rotated by worm and worm wheel. Electrical equipment - 6V Also shown in AP2782A, Section 14.

Tractor, Scammell Mechanical Horse MH6/3 3, 3x2

Notes

MH 6/3 similar to MH6 above except for: -

WB - 8 ft 10¼ in; TC - 19 ft

Axle ratio - 10.28 to 1

Smaller brake shoes, Tyres 8.25-10 all round.

Tractor, Petrol, light, wheeled, David Brown AW100
Manufacturer	David Brown
Engine	David Brown, 4 cyl, petrol, side valve. Bore: 3.5 in, Stroke: 4 in, Capacity: 2.52 litres. Max BHP - 37 at governed speed of 2,200 rpm; Max torque - not stated. RAC Rating - 19.6 hp.
Transmission	Gearbox - 4 speed and 1 reverse. Rear axle - Spiral bevel with spur reduction gears in hub.
Performance	Drawbar pulls (Adhesion 0.75) - 1st - 4,500 lbs, 2nd - 3,100 lbs, 3rd - not stated, 4th - 1.070 lbs, reverse - 4,500 lbs. Max Speed - 1st - 2.33 mph, 2nd - 3.38 mph, 3rd - not stated, 4th - 14.5 mph, reverse - 1.53 mph. MPG - not stated; Radius of Action - not stated
Dimensions	Length - 10 ft 0 in; Width - 6 ft 4 in; Height - 5 ft 0 in; WB - 5 ft 10½ in; G/C - 8½ in (towing hook cross member); TC - 28 ft; Track - 5 ft 0 in:
Weights	Unladen - 3 tons 17½ cwt
Body	Seating - arranged for two with full length back rest. Winch - Drive from centre shaft at rear direct from engine through chain drive. Rope - 100 ft 5/8 in diameter. Pull - 10,000 lbs normal. RAF standard towing hook at rear.
Suspension
Brakes	Mechanical on rear wheels. Trailer brakes - Vacuum take off from induction manifold for operating single line induction brakes.
Tyres	Pneumatic, front - 31 x 9, rear - 12.75-24
Notes	Originally a tracked vehicle, they were later converted to wheeled vehicles with a different 3rd gear ration to AW500.

Tractor, Petrol, light, wheeled, David Brown AW500
Manufacturer	David Brown
RAF Ref No	Unknown
Engine	David Brown, 4 cyl, petrol, side valve. Bore: 3.5 in, Stroke: 4 in, Capacity: 2.52 litres. Max BHP - 37 at governed speed of 2,200 rpm; Max torque - not stated. RAC Rating - 19.6 hp.
Transmission	Gearbox - 4 speed and 1 reverse. Rear axle - Spiral bevel with spur reduction gears in hub.
Performance	Drawbar pulls (Adhesion 0.75) - 1st - 4,500 lbs, 2nd - 3,100 lbs, 3rd - 2,100 lbs, 4th - 1.070 lbs, reverse - 4,500 lbs. Max Speed - 1st - 2.33 mph, 2nd - 3.38 mph, 3rd - 7.1 mph, 4th - 14.5 mph, reverse - 1.53 mph. MPG - not stated; Radius of Action - not stated
Dimensions	Length - 10 ft 0 in; Width - 6 ft 4 in; Height - 5 ft 0 in; WB - 5 ft 10½ in; G/C - 8½ in (towing hook cross member); TC - 28 ft; Track - 5 ft 0 in:
Weights	Unladen - 3 tons 17½ cwt
Body	Seating - arranged for two with full length back rest. Winch - Drive from centre shaft at rear direct from engine through chain drive. Rope - 100 ft 5/8 in diameter. Pull - 10,000 lbs normal. RAF standard towing hook at rear.
Suspension
Brakes	Mechanical on rear wheels. Trailer brakes - Vacuum take off from induction manifold for operating single line induction brakes.
Tyres	Pneumatic, front - 31 x 9, rear - 12.75-24
Notes

Tractor, Petrol, light, wheeled, David Brown VIG 1/100 Crown Copyright^©
Manufacturer	David Brown
RAF Ref No	Unknown
Engine	David Brown, 4 cyl, petrol, side valve. Bore: 88.9 (3.5 in), Stroke: 101.6 mm (4 in), Capacity: 2.423 litres (154 cu in). Max BHP - 37 at governed speed of 2,200 rpm; Max torque - 1,400 lbs/in at 1,400 rpm.
Transmission	Clutch - Borg and Beck single dry plate Gearbox - 4 speed and 1 reverse. Ratios: 1st - 4.14 to 1, 2nd - 2.84 to 1, 3rd - 1.355 to 1, 4th - 0.659 to 1, reverse - 6.21 to 1: Front axle - Fabricated steel beam, centrally pivoted. Rear axle - Spiral bevel crown wheel and pinion, driving through spur reduction gear units in hub. Ratio - 6.14 to 1, (Crown wheel and pinion), 5.21 to 1 (final reduction). Overall ratios - 133 to 1, 91 to 1, 43.5 to 1, 21 to 1, Reverse - 200 to 1.
Performance	Drawbar pulls (Adhesion 0.75) - 1st - 4,500 lbs, 2nd - 3,100 lbs, 3rd - 2,100 lbs, 4th - 1.070 lbs, reverse - 4,500 lbs. Max Speed - 1st - 2.33 mph, 2nd - 3.38 mph, 3rd - 7.1 mph, 4th - 14.5 mph, reverse - 1.53 mph. MPG - not stated; Radius of Action - not stated
Dimensions	Length - 10 ft 11 in; Width - 6 ft 3¾ in; Height - 4 ft 11¾ in; WB - 5 ft 10½ in; G/C - 9½ in; TC - 28 ft; Track - 5 ft 0 in:
Weights	Unladen - 3 tons 17½ cwt
Body	Seating - arranged for two with full length back rest. Winch - Drive from centre shaft at rear direct from engine through chain drive. Rope - 100 ft 5/8 in diameter. Pull - 10,000 lbs normal. RAF standard towing hook at rear.
Suspension	Front - coil spring; Rear - semi-elliptical leaf springs
Brakes	Girling type - Mechanical on rear wheels. Trailer brakes - Vacuum take off from induction manifold for operating single line induction brakes.
Tyres	Pneumatic, front - 9.00-16, rear - 12.75-24
Notes	Steering - Screw and nut type. Similar to AW500 but with improved trailer braking provision and improved winch Also shown in AP2782A, Section 14.

Tractor, Petrol, light, wheeled, David Brown with Turbo Transmitter (VIG 1/462) Crown Copyright^©
Manufacturer	David Brown
RAF Ref No	Possibly 16A/751
Engine	David Brown, 4 cyl, petrol, side valve. Bore: 88.9 (3.5 in), Stroke: 101.6 mm (4 in), Capacity: 2.423 litres (154 cu in). Max BHP - 37 at governed speed of 2,200 rpm; Max torque - 1,400 lbs/in at 1,400 rpm.
Transmission	Clutch - see notes below. Gearbox - 4 speed and 1 reverse. Ratios: 1st - 4.14 to 1, 2nd - 2.84 to 1, 3rd - 1.355 to 1, 4th - 0.659 to 1, reverse - 6.21 to 1: Front axle - Fabricated steel beam, centrally pivoted. Rear axle - Spiral bevel crown wheel and pinion, driving through spur reduction gear units in hub. Ratio - 6.14 to 1, (Crown wheel and pinion), 5.21 to 1 (final reduction). Overall ratios - 133 to 1, 91 to 1, 43.5 to 1, 21 to 1, Reverse - 200 to 1.
Performance	Drawbar pulls (Adhesion 0.75) - 1st - 6,000 lbs, 2nd - 6,000 lbs, 3rd - 6,000 lbs, 4th - 3,500 lbs, reverse - 5,000 lbs. Max Speed - 1st - 2.33 mph, 2nd - 3.38 mph, 3rd - 7.1 mph, 4th - 14.5 mph, reverse - 1.53 mph. MPG - not stated; Radius of Action - not stated
Dimensions	Length - 10 ft 11 in; Width - 6 ft 3¾ in; Height - 4 ft 11¾ in; WB - 5 ft 10½ in; G/C - 9½ in; TC - 28 ft; Track - 5 ft 0 in:
Weights	Unladen - 3 tons 16½ cwt
Body	Seating - arranged for two with full length back rest. Winch - Drive from centre shaft at rear direct from engine through chain drive. Rope - 100 ft 5/8 in diameter. Pull - 10,000 lbs normal. RAF standard towing hook at rear.
Suspension	Front - coil spring; Rear - semi-elliptical leaf springs
Brakes	Girling type - Mechanical on rear wheels. Trailer brakes - Vacuum take off from induction manifold for operating single line induction brakes.
Tyres	Pneumatic, front - 9.00-16, rear - 12.75-24
Notes	Steering - Screw and nut type. This tractor is similar to the model VIG 1/100 with the exception that a Turbo Transmitter replaces the clutch in the drive from the engine to the road wheels and winch. The Turbo Transmitter gives an automatic torque increase with a maximum torque magnification of approximately 3.5 to 1 and allows the maximum pull to be developed, when towing or winching, without 'snatch'. Also shown in AP2782A, Section 14.

Tractor, petrol, light, wheeled, Fordson Industrial, 4x2 Crown Copyright^©
Manufacturer	Ford
RAF Ref No	Possibly 16A/151
Engine	Ford, 4 cyl, petrol. Bore: 104.8 mm (4.125 in), Stroke: 127 mm (5 in), Capacity: 4.38 litres (267 cu in). Max BHP - 45 at 1,800 rpm; Adjustable centrifugal type governor - Correct operating speed 1,100 rpm. RAC Rating - 21.17 hp
Transmission	Clutch - Multiplate, wet type. Gearbox - 3 speed and 1 reverse. Ratios: 1st - 4.485 to 1, 2nd - 3.184 to 1, 3rd - 1 to 1, reverse - 3.316 to 1: Front axle - 'I' section, braced with radius rods to take up thrust. Rear axle - Semi-floating, worm and wheel drive, ratio 11.48 to 1: Overall ratios - 51.13 to 1, 36.3 to 1, 11.48 to 1, Reverse - 37.88 to 1.
Performance	Max Speed - not stated; MPG - not stated; Radius of Action - not stated
Dimensions	Length - 8 ft 10-7/16 in; Width - 5 ft 2-15/16 in; Height - 6 ft 0½ in (including intake and exhaust pipes), 4 ft 8 in (excluding intake and exhaust pipes); WB - 5 ft 3 in; G/C - 9 in; TC - 21 ft 6 in; Track - 3 ft 10 in (front), 4 ft 6 in (rear)
Weights	Unladen - 1 ton 10 cwt; Laden - 1 tons 13 cwt.
Body	Drawbar gear - Unsprung Ford type with automatic hitch.
Suspension	Axle mounted in a sleeve free to move vertically against a rubber buffer.
Brakes	Foot - Multiple disc transmission brake operated by full depression of the clutch pedal, which may be held in this position by means of a holding catch. Hand - Mechanical on rear wheels. Trailer connection - Vacuum line from induction manifold.
Wheels/Tyres	Detachable rim or well base/6.00-19 on front, 11.25-28 on rear.
Notes	Steering - Sector and worm.. Electrical equipment - 6V. Also shown in AP2782A, Section 14.

Tractor, Petrol, light wheeled, Clarktor 6 Aerodrome
Manufacturer	Clark (US)
RAF Ref No	Unknown
Engine	Chrysler, Industrial model T112-522, 6 cyl, petrol. Bore: 82.5 mm (3.25 in), Stroke: 111 mm (4.375 in), Capacity: 3.55 litres (217 cu in). Max BHP - 66 at 2,250 rpm; Max torque - 1,992 lbs/ins at 1,200 rpm. RAC Rating - 25.4 hp T125 engine fitted to some models.
Transmission	Clutch - Borg and Beck, single dry plate. Gearbox - 3 speed and 1 reverse. Ratios: 1st - 3.46 to 1, 2nd - 1.71 to 1, 3rd - 1 to 1, reverse - 4.25 to 1: Rear axle - Clark double reduction, ratio 12.25 to 1: Overall ratios - 42.39 to 1, 20.95 to 1, 12.25 to 1, Reverse - 52.06 to 1.
Performance	Max Speed - 1st gear - 3.5 mph, 2nd - 7 mph, 3rd - 12 mph; MPG - not stated; Radius of Action - not stated
Dimensions	Length - 8 ft 4 in; Width - 5 ft 6 in; Height - 4 ft 8 in; WB - 4 ft 10-7/8 in; G/C - not stated; TC - not stated; Track - 3 ft 10 in (front), 4 ft 6 in (rear)
Weights	2 ton 5½ cwt.
Body
Suspension
Brakes	Foot - Hydraulic, vacuum servo assisted. Hand - Mechanical on transmission.
Wheels/Tyres	Front - 4.25-9, rear - 4.50-16 dual/6.00-9 on front, 6.00-16 dual on rear.
Notes	Steering - Saginaw gear, type 530-D-41 Electrical equipment - 6V. Also shown in AP2782A, Section 14.

Tractor, petrol, light, semi-tracked, Fordson-Roadless
Manufacturer	Ford
RAF Ref No	Unknown
Engine	Ford, 4 cyl, petrol. Bore: 104.8 mm (4.125 in), Stroke: 127 mm (5 in), Capacity: 4.38 litres (267 cu in). Max BHP - 45 at 1,800 rpm; Adjustable centrifugal type governor - Correct operating speed 1,100 rpm. RAC Rating - 21.17 hp
Transmission	Clutch - Multiplate, wet type. Gearbox - 3 speed and 1 reverse. Ratios: 1st - 4.485 to 1, 2nd - 3.184 to 1, 3rd - 1 to 1, reverse - 3.316 to 1: Front axle - 'I' section, braced with radius rods to take up thrust. Rear axle - Semi-floating, worm and wheel drive, ratio 11.48 to 1: Overall ratios - 51.13 to 1, 36.3 to 1, 11.48 to 1, Reverse - 37.88 to 1.
Performance	Max Speed - 1st gear - 1.4 mph, 2nd - 2.3 mph, 3rd - 6.3 mph, reverse - 1.86 mph;
Dimensions	Length - 10 ft 8 in (packing for shipping - 11 ft 8 in); Width - 5 ft 9 in (packing for shipping - 6 ft 0 in ); Height - 4 ft 7 in (packing for shipping - 4 ft 11 in); WB - 6 ft 0 in; G/C - 9 in; TC - 21 ft 6 in.
Weights	Unladen - 3 ton 5 cwt
Body	Winch - either Hesford Major fitted at front of tractor or Hesford Minor fitted at rear of tractor. Drawbar - Latitudinal swinging, Height 11 in. Drawbar HP - 17 hp. Pull - 1st gear - 4,500 lbs, 2nd - 2,740 lbs, 3rd - 1,000 lbs
Suspension	Axle mounted in a sleeve free to move vertically against a rubber buffer.
Brakes	Foot - Multiple disc transmission brake operated by full depression of the clutch pedal, which may be held in this position by means of a holding catch. Hand - Mechanical on rear wheels. Trailer connection - Single line vacuum system fitted only to tractors with front mounted winch.
Wheels/Tyres	6.00-19 pneumatic on front
Tracks	Plate width, 1 ft 1 in. Length on ground - 3 ft 4 in. Area of ground contact - 1.040 sq in. Pressure per sq in - 5.3 lbs
Notes	This tractor is a half-tracked version of the Fordson Agricultural (Industrial) tractor shown above (16A/151), the normal rear driving wheels being replaced by Roadless Traction rubber-jointed tracks. The front wheels are fitted with pneumatic tyres. Steering - Sector and worm.. Electrical equipment - 6V. Also shown in AP2782A, Section 14.

Tractor, petrol, light, semi-tracked, Case-Roadless Crown Copyright^©
Manufacturer	Case (US)
RAF Ref No	Unknown
Engine	Case D-EX, 4 cyl, petrol. Bore: 3-7/8 in, Stroke: 5½ in, Capacity: 259 cu in. Max BHP - not stated.
Transmission	Gearbox - 4 speed.
Performance	Max Speed - 8-9 mph.
Weights	Unladen - 3 ton 5 cwt
Tracks	Plate width, 1 ft 1 in. Length on ground - 3 ft 4 in. Area of ground contact - 1.040 sq in. Pressure per sq in - 5.3 lbs
Body	Winch - not fitted Crane - Case Roadless tractors are fitted with Morris hand operated 1 ton hoist to lift 1 ton over front.
Brakes	Trailer connection - Single line vacuum system fitted only to tractors with front mounted winch.
Notes	All other details are similar to the Fordson-Roadless Tractor shown above. Also shown in AP2782A, Section 14.