19-9-62 Bruce McLaren Does 9 Magic 100 An Hour During Likely champion Jack The Brabham, believes former world racing driver, Wigram Training that if Wigram is not lapped by someone at 100 BRUCE MCLAREN was unofficially timed to do 97.66 miles an miles an hour to-morrow hour when the overseas racing drivers got down to business ehere are drivers here smartly this morning in the first training session for to morrow's who will certainly get 150-mile Lady Wigram Trophy race. close te it. They were out on a 2.116- • Hoss with the 2.5 litre Lotus|sun, were making adjusttraining mile shortly after and the Italian Lorenzo Ban-merits to all the cars and session for the Lady Wigram ten o'clock and had an hour dini 2.8 litre the tyre experts were ex- Trophy this morning, Brab- in familiarise Cooper-Maserati. perimenting with pressures. ham, relaxing in shorts in themselves with the circuit. companies': Everyone mas look• Time trials for grid ing for that last ounce hospitality tents, said positions for the race Third Time thought that the men who of power. to-morrow did not start would occupy the front row The Bowmaker - Yeoman of the starting grid to-mor- until 1.30 p.m. row would get down to 1min A veil of secrecy still sur- Lucky? racing stable appeared to be carrying out the most exqualifying rounded the overseas camps tensive modifications. trials this afternoon. and no one was giving much Dogged by bad weatber At the conclusion . of the That figure represents a. away, but it was obvious at Ardmore and Levin, first training session the speed of 98.93 miles an hour. the cars were going racing car drivers should ratios were "The magic century" would much faster than ther had gear being be favoured for the Lady changed in the Cooper of require a time of 1min 16.176 ever gone before at Wigram. the No. I driver, John Sur- Wigram Trophy race at tees. 97.66 m.p.h. the Royal New Zealand Three Scratch Slow Laps Perhaps the fastest was Air Force Station, Wig- Three arivers were Aucklander Bruce licLaren, ram, to-morrow. scratched from the trophy with the 2.7 litre C. I. Atkins The Weather Office at Twice winner of the trorace this moming. They are Cooper. Jack Brabham the Christchurch veteran Harewood this afternoon made phy race brief appearance Hector Green, R. A. Levis, He was unofficially predicted north-east wind early in the morning session of Putaruru, and L. Stonnell timed at 1min 18sec to put in two fairly slow 97.66 miles an hour. with fine, warm wreather. laps with his 2.7 litre of New Plymouth Green was right out of Next in line were Stirling Cooper. luck. The clutch of his R.A. They were privately timed Then, in the concluddisintegrated during at lmin 19sec — 96.43 miles! ing stages, he came out morning's training session. Bruce McLaren at an hour. again and • trailed Stirl- Levis broke a leg when speed in his Cooper These times were pro- ing Moss, obriously his car rolled over at the during circuit at bably not true indications wanting to see just Levin international meeting Wigram this morning. of the limits likely to what Mr Motor Racing last Saturday. was unofficially attained later in the day. was up to. No reason was given for timed at 97.66 miles an Stonnell's scratching. Mechanics, some stripped Moss did not drive the hour. Ito the waist in the blazing other R.R.C. Walker car, the 2.7 litre Cooper, at Wig this morning, and it seemed almost certain that he would race the Lotus, which appeared to be handling exceptionally well. There was a sizeable crowd at the circuit before midday, and the other public car park opposite the pit straight was filling up rapidly. The temperature was stea- [dily rising and shorts and i sun frocks were the order For motor racing enthu. siasts it was a happy change from the wet meetings at Ardmore and Levin. 7.66 Miles mae- Rain Tyres Can 'Cling' After two wet Satur days of international motor racing at Ardmore and Levin, enthusiasts are keeping their fingers crossed and hoping the weather will remain fine for the 150-mile Lady Wigram Trophy to-morroW. But the overseas racing camps are taking chances. In addition to normal dry weather racing tyres, they will have sets of rain tyres on hand in their pits, "just in case." Newspaper reports of the Ardmore and Levin meetings contained references to the use of rain tyres by the leading overseas drivers, and they have evoked the curiosity not only of car racing • enthusiasts but motorists generally. More Cling® A rain tyre differs from an ordinary tyre in that one of its constituents consists of what is known as high hysteresis or "cling" rubber. • Rubber, unlike a steel spring, is not perfectly elastie so when a load is applied to it and then released it does not regain its original shape immediately and some of the application energy stopped up in the rubber is changed into heat. This is known. as the nysteresis effect. With Moisture Hysteresis properties of rubber have been studiec closely, because the nigher the. hysteresis, the more energy absorbed. When more energy is absorbed the tyre becomes hotter and temperature must be controlled in the interests of tyre life. In recent years research workers have found that there are certain types of rubber which possess high hysteresis and also a high co-efficient of friction against other suriaces, even in the presence of moisture. Normally moisture lowers the friction coefficient of rubber considerably. This effect may be due to the lower elasticity of the rubber, making cling more closely to the other surface. But the higher co efficient of friction means an appreciable increase in skid resistance. I'nis, course is particularly significant when the road is wet and when maximum skid resistance will be needed. On the other side of the picture, "eling" rubber tends to run somewhat hotter than ordinary rubber and it is for this reason that racing motorists are generally reluctant to use rain tyres unless it is absolutely necessary to do so. On a dry track a rain tyre would not last neariy so long as normal dry weather racing tyre. FOOLONE. The forecast for to-morrow is fine.