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Heavier is more fuel efficient
Page 6
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CAREFULLY monitored tes show that a 40-tonne vehic gave worthwhile fuel savini when compared with a 32-tc model running over the sarr route.
Project Octave, oil conse vation — transport an vehicle efficiency, a Motc Transport exercise, execute in conjunction with Foden Rolls-Royce and York, showe that the heavier lorry gave a 2 per cent improvement in th use of fuel.
Trigo identical Foden Flee master tractive units wet used powered by the RR 290 Eagle engine. At 32 tons Um vehicle's York Freightmast( semi-trailer was equipped wit a tandem axle and for 4 tonnes a tri-axle configuratio was used with super singl tyres.
Although the vehicl operating at 40 tonnes is 23 pe cent heavier than the 32 to comparison unit, it showed benefit in payload of 33 pe cent. Using the Transport an Road Research Laborator single-axle concept, it wa shown that the axle weight c this 40-tonner caused les damage to the road surfac than its 32-ton counterpat when calculating the numbe of journeys needed to carr 100 tons of goods.
As the two tractive unit were identical, little differenc, was detected in the nois, emitted. Braking and stabilit: of the vehicles did not prove tl be very different either.
Fourteen per cent o vehicles have the capability t( operate at 32 tons. Three quarters of those could, i allowed, operate at over 3: tons. It is unlikely that if i 40-tonne limit were adopted that full advantage could b( taken by all operators.
Existing equipment woulc limit many to 38 tons gross foi some time. A 40-tonne limit a compromise solution anc with a 24-ton tri-axle bogie the extra capacity will accom. modate load distribution.
The EEC axle proposals for an 11-ton drive axle gives little more room for manoeuvre.