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Developing a Scammell for Short Hauls A 30-ad. Lorry for

18th November 1938
Page 66
Page 66, 18th November 1938 — Developing a Scammell for Short Hauls A 30-ad. Lorry for
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Shortradius Operation. Rear Axle, Transmission and 15 b.h.p. V -twin Engine Built as a Unit NEARLY two years ago we described a new mechanical horse, having a twin-cylindered air-cooled engine, that had been designed and patented by Scammell Lorries, Ltd., Watford. The description appeared in our issue dated January 15, 1937.

Since then developments of the original idea have taken place, and about six months ago a four-wheeled lorry based on the design of the three-wheeler was put in the service of the Great Western Railway Co. We are now permitted to publish particulars of this machine, which is of considerable interest.

As before, a V-type twin-cylindered engine forms the power unit. It is of 832 c.c. and develops 15 b.h.p. at 3,000 r.p.m. The employment of air B30 cooling is bantinued. This is a feature that makes a strong appeal to the railway companies, because it eliminates a component that is liable to cause trouble, and it is no source of bother or anxiety in frosty weather.

The cooling system comprises a fan, belt-driven from the front end of the crankshaft, and enclosed in a cowling immediately in front of the cylinders.

Engine, gearbox, transmission, back axle, and driving wheels form a unit, which is anchored to the frame, at a point roughly amidships. The fixing incorporates a rubber cushion, through which the tractive effort is transmitted.

Between the driving axle and the frame there are coil springs, carrying the sprung weight of the rear part of the vehicle, shock absorbers controlling the relative movement, and at the front there is a similar arrangement of suspension. The top gear ratio, incidentally, is 10.57 to 1. Capable of carrying a load of SO cwt., this Scammell is primarily intended for the collection and delivery of light parcels, and certainly seems well adapted for this class of work within a short radius of its base.

An asset to operation in narrow streets, railway yards, docks, etc., is its small turning circle-30 ft., whilst an advantage on house-to-house work is the ease with which the driver can enter and leave the cab on either side. This gain largely accrues, of course, from the under-body position of the power -unit.

Unladen, the van weighs less than 1 ton, whilst the platform area measures 10 ft. by 6 ft. The wheelbase is 7 ft 6 ins., overall length 14 ft. 6 ins., and loading height 3 ft. when laden, its track is 5 ft., overall width and height6 ft. and 6 ft. 10 ins., respectively, whilst under the axle there is a clearance of 8 ins.

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