1929-09-26 — Page 11

THURSDAY, SEPTEMBER 26, 1929.

THE CHINA MAIL,

ANTHE MOTORISTS PAGE

KL

B.S.A.

This brufa Markt to the

property

The Big?"

Armada. Ital.

Meningham, England

THE MARK

OF

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SPEED SILENCE SAFETY

ECONOMY RELIABILITY

AS EVIDENCED IN

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MONET-GOYON & F.N.

SHIPMENT OF 1980 MODELS EXPECTED SOON

PRICES REDUCED FOR 1929 MODELS

DROP OF GASOLINE

MORE THAN A FOOT OF MILEAGE IN IT

Through the medium of an efficient automobile engine a single drop of gasoline will roll ar automobik weigh ing nearly a ton and a half over more than a foot of highway.

TYRE WEAR

NOTES BY RESEARCH EXPERT

Interesting data about tyre wear and its causes is provided by Mr. L, J. Ianbourn, M.Sc., A.Inst.P., A.I.R.I (St.), of the Fort Dunlop Research Laboratory.}

This example of the marvellous There is considerable difficulty in ob power developed in the modern auto-taining definite data about tyre wear mobile was figured out by Werner if the research is confined to tyre ger- Fetz, research engineer, after complet vice on the road. In comparing ine ing a 3,000-mile trip in his Oldsmobile tyre with another, speed, the type of Six landau.

driving, the type of car, the kind of road surface, the weather, the air frm. perature, all vary so much that it is not easy- get accurate results.

In order to wipe out all these varia- bles, a special machine has been de-

For the first 1,000 miles of the trip Mr. Felz and a companion alternated at the wheel, each driving 100 miles at a time, and made sopa only for gaso line and one meal. The remainder of the trip was made by Mr. Fatz alopeveloped and patented in which condi- but it showed equally outstanding car Lions representative of rough roads, wet roads, roada covered with dust, quick performance.

acceleration, wheel spin, high tempera- ture, can all be reproduced and on- trolled.

At the conclusion of the rip Mr. Fetz's engineering mind was intrigued by the performance of to-day's auto- mobiles, and he figured to the drop of gasoline how much power was develop ed.

The relation between abrasion, or wear of tyres, and slip, which, of course, is always taking place when tyres are running, can be quite actur- ately determined.

"Car owners talk a good deal about the mileage their cars make per gallon

of gasoline." said Mr. Fetz. "I doubt, Approximately, the rate of wear in- however, that the majority of them creases not in direct ratio to the slip, realise what their statements invalve. | but rather as the square of it up to We may discuss the billions of dollars values of about 6 per cent. Above that spent during the war, or the hundreds value, the relation is approximatoly of light years a star is away from us, linear. but since we cannot visualise such figures they have absolutely no mean- ing.

"It is the same with gasoline mileage. Take, for example, a car which aver ages 17.8 miles per gallon and see what this consumption of gasoline actually means after we have reduced these figures so that we can grasp them more easily.

"Seventeen, and eight-tenths miles represents 23,984 feet, and one gallon of gasoline contains 68,602 drops. Consequently it requires 0.73 drops of Kesoline to move the automobile one fool.

As showing the accuracy with which

the machine and road results can be compared, samples of the actual treads of tyres were made into test wheels while the real tyres were ran under average conditions and the rate of wear of the tyre, on the road on the machine was compared,

The value of a hundred being taken to represent the standard tread pound, the following results were obi tained:--

On the road

Relative Wear

100

on máchine

100

Thus we have figures we can grasp, understand and visualise. This power- ful six-cylinder Oldsmobile required a scant three-quarter drop of gasoline to move it one foot along the road. To comprehend the full significance of this fact look at the size and weight of the car and the engine, the three-quarter drop of gasoline and one foot of the road. One cannot help but be amazed-Other tests, on the road, shoved at such marvellous machine perform that one tyre on a car ran 8,400 miles arce utilising the energy stored up in such a tiny speck of gasoline.

130

.132

142

150

225

200

93

95

117

92

317

02

"Literally millions of us are driving automobiles every day, yet there are iew drivers who know little or any thing of the mechanical, electrical or chemical actions which take place in producing the desired result of loco motion. The modern automobile truly a phenomenon."

Commenting upon other performance features of this Oldsmobile, Mr. Fetz said:

The bandling of the car is easy and does not require any unnecessary effort. The driver's energy is conserved and with it comes a sense of security which is vital on long distant trips.

"Drivers who have experienced a flat front tyre while going at high speed know the usual steering difficul ties. During our trip the right front tyru went down. Although the Car was going fast over a hard but rough road there was no noticeable change in the ease steering. And in spite of this almost stubborn steering steadiness the car obeys instantly to the slight- ́est turn of the steering wheel. This is

particularly helpful in city traffic.”

GASOLINE COSTS

OWNERS REPORT UNUSUAL ECONOMIES

More scientific engineering of motor and carburettor has made possible. for thousands of owners sensational say- ing of gasoline and other economies in the operation of the Superior Whippet fours and sixes, according to reports. received by Willys-Overland dealers.

It has been found for example, that the increase of the compression ratio in the motor has succeeded not only in neutralising the added weight of the car end the increased tyre dipensions, but has a marked effect on gasoline economy. Owners who actually have attempted to acurately check their gasoline consumption with the six cylinder models found that they were able to obtain economies in excess of 20 miles to the gallon of gaseline. In fact, the average economy of a 4,000, mile trip, mountains, détours and rough roads, was in excess of 18 miles to the gallon, carrying in this case a fall five- passenger kad. Gasoline mileage ob tained with the four cylindered. nodela was, of course, even more phenomenal.

The carburettor in both the fours and sizes also has been completely designed to suit the bigher compression of the motor. The economy results shown by the Whippets are all the more

re-

SIDECARS—ACCESSORIES SPARE PARTS significant when coupled with a higher

IN STOCK.

Easy Payment Plan.

THE FRENCH MOTOR CYCLE CO.,

46, Nathan Road, Kowloon,

and

top speed and greater pick-up other activity in traffic. In tests con- ducted by company engineer with a standard four sedan carrying five pas sengers up Cove Mountain, the speed of the car was reduced to between 10 and 11 miles an hour at the steepest point of the grade and yet under these circumstances the engine fired as evenly as it would at 20 miles per hour and there was no evidence of roading or flatness as the engine speed increase due to the reduction in the grade

during December to March while in olher, used during April, May and

June, ran only 6,000 miles, Another test, in which two exactly similar tyre wero man at the same period on the rear wheels of two cars of the same type, showed that the rate of wear on the one ran on rough roads was twice that of the other, run on tarmac.

Two tyres were again run on the rear wheels of a touring car and a sports car respectively. The tyre on the touring car ran for, 5,000 miles under average conditions, but the other tyre was worn to this same extent after running only 335 miles at an average of 90 m.p.h..on a racing track.

Considering fast touring speed, the rate of tread wear on tyres which average 50 m.p.h. was found to be about 0.17 m.m. per 1,000 miles and this is about twice the rate of wear of tyres run at an average speed of 30 m.p.h. Above 65 m.p.h. the increase in wear is very rapid.

Excessive toe-in has a

very bad effect and it has been-found that a toe- in of of an inch should not be exceeded, otherwise the tyro will not last its full life. A tyre run with a toe-in of inch was nearly worn out after 8,700 miles. Another with toe-in of 1/16 inch has run 9,000 miles and is not yet nearly worn out.

Testi made for wheel slip with a motor cycle combination showed that on

crass country run at normal speeds there was a total slip of only 1 per cent, but on a rough road a short run at 62 m.p.h. gave a slip of 4% per cent. By fiercely engaging the clutch for rapid acceleration & slip of 16 per cent. was obtained. In a similar "get- away," measuring the slip on the first 33 yards only. it amounted to the very high figure of 48 per cent. If the slip be doubled, four times the amount of tread rubber will be worn away.

It is of interest to note how the wear of tyres varies according to the season of the year, partly due to the tempera- ture and partly due to the wetness or dryness. For instance, the rate of wear of a large quantity of tyres in July of three successive years was 9/10. m/m per thousand miles, while in Janumy of the corresponding years, it was only 6/10 m/m per thousand railes.

VAUXHALL

LANE, CRAWFORD, LTD. Automobile Dept. C.3193.

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11