Underfloor Engine in New Bus Chassis for Overseas A NEW Sentinel overseas underfloor
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engined pa sse nger chassis. equipped with a Park Royal single-deck body. will be shown at Earls Court. Some of these service buses are being produced for operation in Brazil, and although the prototype accommodates 39 seated passengers, subsequent bodies will seat 42 people, with standing space for about 30 more.
The frame is 33 ft. 2 ins. long and is equipped with a Sentinel six-cylindered 135 b.h.p. horizontal oil engine, Meadows five-speed gearbox, overheadworm drive and Clayton Dewandre compressed-air braking apparatus. The frame side members are level on the top flange, and the off-side member is cranked laterally round the cylinder heads.
Integral Body Construction Although a normal chassis frame is provided, the body is of integral construction and has a floor height of 3 ft. 2 ins,, the floor angles and diaphragms being secured direct to the frame. Deep sills extending round the extremities of the outriggers and diaphragms are drilled to receive the vertical pillars.
The engine, supported on a flexible mounting and with a restrainer to control the fore-and-aft movement, is carried amidships in the frame, with the crankshaft offset to the centre line of the chassis. A two-piece jatkshaft drives the fan and dynamo mounted at the front under the cab, the fan operating in a tunnel which contains a bearing to suppor.r the fan spindle.
The gearbox is separate from the engine and clutch, and the selector control from the cab passes over the power unit and through an enclosed relay attached to the flywheel homing to the lower part of the box. A Clayton Dewandre two-cyllindered compressor is housed inside the frame, and is driven by belt and pulley from the shaft connecting the dutch and gearbox.
Heavy-duty semi-elliptic springs are provided at the front and rear, and A26 massive hydraulic telescopic shock absorbers assist in controlling spring movement. Tyre equipment is 11.00 by 20-in, all round, with twins at the rear.
The body will have a front entrance, immediately forward of the axle, and a central exit, with double-folding doors electrically operated and under the control of the driver.
A i-in. softwood floor is laid direct on the underframe, and is covered with a On. layer of Insulwood and heavy Alfol insulating material is sandwiched between the inner lining and exterior panels of the roof. The body has a roof-ducted ventilation system, with assistance from electrically operated fans.