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Air Bellows and Leaf Springs Preferred
Page 44
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rOMPARING air-suspension systems,
Mr.. P. H. Wyke Smith; chief engineer of the Trent Motor Traction Co., Ltd., told the Midlands centre of the Institute of Road Transport Engineers in Birmingham, last week, that he preferred the type based on air sacks combined with light leaf springs, because it would obviate frequent rebushing of stabilizing members. This system was, he thought, better than that incorporating, radius rods.
I4e was commenting on observations he had made in his paper, "Taking Stock on Maintenance," He remarked that only four power units tin the market gave favourable specific fuel consumption curves under test. Black' smoke: was sometimes caused by an excessively high lift of the fuel injector.
Answering questions, Mr. Wyke Smith said that the main problem resulting from high-speed running on motorways would be the rapid wear of tyres. The performance of turbochargers had so far been disappointing, in that many blown engines did not consume less fuel. Optimum results might be obtained only by reducing the compression ratio.
Dealing with tyre retreading, he said there was no limit to the number of times a metallic cover could be treated. He knew of such tyres being retreaded 10 times.
Regarding engine lubricants, Mr. Wyke Smith pointed out that the danger of prolonging the interval between oil changes was that continued use increased the viscosity of the lubricant. Detergent oils could not be reclaimed, but they could satisfactorily be refined again.
.Welcoming the advantages offered by disc brakes, he said that their application to bus chassis would save' 24 cwt.
TWO NEW ICE-CREAM CANTEENS
BASED on the Bedford l5-cwt. chassis, two new ice-cream canteens have been announced by Smith's Delivery Vehicles, Ltd., Gateshead-on-Tyne, 11. The first, to be known as the Cornette Mark II, retains the rounded contours of an earlier model, but has been restyled to present a more contemporary interior appearance. The floor space has been increased so that two large ice-cream conservators can be carried, The Mark III Cornette is an entirely new product, in which a large proportion of the bodywork is glazed. The interior layout makes full use of available space.
A greatly increased production programme is planned. with a consequent reduction in price. The basic price of the Mark II body is now £449 and the Mark HI is to be sold at £396. Both models are fully fitted as mobile canteens.
MORE RED ON BUSES
NiTANCHESTER double-deck buses are ILL to be painted almost completely red to cut down costs, the transport committee have decided, Vermilion will he used in future on the front and rear wings, radiator grilles and dograils.