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Largest British Double-deckers

19th July 1957, Page 33
19th July 1957
Page 33
Page 33, 19th July 1957 — Largest British Double-deckers
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ACHASSIS that will he completed by Guy Motors, Ltd., Wolverhampton, in six to eight weeks' time will be the first to be supplied to Johannesburg Municipal Tramways as part of a £300,000 order for 10 motorbuses and 40 trolleybuses based on similar chassis (The Commercial Motor, May 24),

Of the three-axled type, the chassis has a wheelbase of 20 ft., and will carry a 105-passenger double-deck body, built by Bus Bodies, Ltd., of Port Elizabeth. There will be 51 seats on the upper deck and 34 on the lower deck, with accommodation for 20 standing passengers.

The bus will have air-operated jackknife doors at front and rear, and a rear staircase, as opposed to the provisional layout described in The Commercial Motor, on May 6, 1955, which detailed an integral-construction bus

with front and rear staircases. The complete vehicle will be 33 ft. 101 in. Iting and 8 ft. 21 in wide, and the overall laden height will be 14 ft. 8+ in.

A Rolls-Royce C.6.NFR 12.2-litre oil engine powers the chassis, this being &rated to develop 156 b.h.p. at 2,100 r.p.m.. because it will be operating 6,000 ft. above sea-level. The maximum torque output is 425 lb.-ft. at 1,300 r.p.m.

A five-speed pre-selector epicyclic gearbox is employed: this has forward ratios of 5.55, 4.2, 2.38, 1.57 and 1 to 1, reverse being 9.09 to 1.

The bogie has Kirkstall underslungworm axles with 8-1--in, centres and a third differential forward of the leading axle. The oil-engine chassis has 6.75-to-l-ratio axles, but the trolleybuses, which have B.T.H. electrical equipment, have 10.33 to 1 final drives. Four-spring suspension is employed at the bogie.

Bendix-Westinghouse diaphragm-type air brakes are fitted and the front brakes measure 164 in. by 7 in., with 17-in. by 6-in, assemblies at the rear. The total frictional area is 988 sq. in., which gives 55 sq. in. per ton gross weight, assuming a gross laden weight of 18 tons.

Auxiliary equipment includes Marles hydraulically assisted steering gear and Clayton Dewandre automatic chassis lubrication. The chassis has 13.00-20-iv. (16-ply) single tyres on all wheels.

84 STARTERS AT OXFORD L'IGHTY-FOUR entrants will take part in the Oxford eliminating round of the Lorry Driver of the Year Competition on Sunday. The road section of the competition will begin at St. Giles, Oxford, and follow a complicated route to Oxford Airport, Kidlington, where three manceuvring tests will be performed.

Apart from the two nationally prescribed tests, involving the estimation of vehicle widths and parking at the kerb, the drivers will take part in a third exercise which requires them to zig-zag forward and reverse between three pylons.

100 ABERDONIANS ORDERED

BR1TISH bus concerns have. ordered nearly 100 of the new Albion Aberdonian lightweight model which was described in The Commercial Motor on June 28.

Potteries Motor Traction Co., Ltd., have ordered 34, and W. Alexander and Co. (Coachbuilders), Ltd., 26.


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