Guy Invincible Tippers For Poland
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AN order for 11 six-wheeled tippers has been received from Poland by Guy Motors, Ltd., Wolverhampton, and the first of these vehicles has already been delivered. They are based on Invincible Mark II chassis and are being shipped out complete with Edbro scow-ended bodies.
The double drive rear bogie used on these chassis incorporates a limited-slip third differential, and the worm axles have a reduction ratio of 8.25 to 1. The axles carry 11.00-20-in. (16-ply) twin tyres, and single tyres of this size are used on the Kirkstall heavy-duty front axle.
Power-assisted steering is fitted and Armstrong telescopic dampers are incorporated in the front springing. Rear suspension consists' of four semi-elliptic springs with balance beams. Girling two-leading-shoe brake assemblies are used on each axle: the drum diameter in each case is 15.5 in. These wedgeoperated units are actuated through a Clayton Dewandre dual-circuit airpressure system.
Another order received by Guy from overseas has been for 10 18-ft.-wheelbase passenger chassis for South African
Railways. These vehicles are of the trambus type, in which the Rolls-Royce B81. Mk. 70H petrol engines are mounted well ahead of the front axle, a layout which enables a front entrance to be incorporated.
The ZF six-speed synchromesh gearboxes have air-assisted gear-change mechanism, and the KirkstaIl hypoid rear axles have a reduction ratio of 7.16 to I. The gearbox is mounted separately from the engine and clutch.
Girling brakes are used on both axles, and they are actuated through a BendixWestinghouse dual-circuit air-pressure system. Woodhouse-Monroe telescopic dampers are employed at both axles, and the vehicles are rated for a gross vehicle weight of 10i tons, the maximum permissible front axle loading being 5 tons.
In South Africa the chassis will be equipped with 35-ft. by 8-ft. 2-1-in, semiluxury passenger bodywork. Six further chassis of this type, but smaller and powered by Rolls-Royce B60 petrol engines, are also to be constructed.
A further South African order is one received from Johannesburg Municipal Tramways for 20 more six-wheeled double-decker passenger chassis, similar to the 10 supplied in the early part of 1958. These new chassis are to have semi-automatic gearboxes.