1930-01-25 — Page 15

THE HONGKONG TELEGRAPH, MOTORING SUPPLEMENT.

INTERNATIONAL TUBE HALF FINISHED.

FREDER

FREAKBEA

(60 fra 192, 1995 GARIBS 14

1 large sections such as shown here, the international tunnel has been laid across the bottom of the Detroit river. Plan below shows how the auto tunnel is being built, and the cross section at left how it will be ventilated.

AIRPLANE & AUTO- MOBILE ENGINES.

Why Different Design Necessary.

(By Israel Klein.]

Motorists have asked me more than once why airplanes have to be equipped with an engine of dif- ferent design from that of the au- tomotive engine. To them it seems that the automotive power plant might do just as well for the air plane or that the more powerful aircraft engine might enhance the 'performance of the automobile.

Here, however, are two entirely different types of transportation, ench requiring its own peculiar means of motive power. Their re- quirements are such that each en- gino is efficient only in its place and would be altogether useless if transferred.

The basic difference between au- tomotive" and aircraft engines lies in its order of their requirements. Both types, of course, lave exactly the same requirements for efficient and profitable operation. But they differ in that, outside of only one, these requirements are reversed in order of Importance.

Detroit, Dec. 17th--Man, bas, great tunnel will be free from conditions and a completo change achieved new marvels of engineer- carbon monoxide gas and purer will be made each 90 seconds The power layout is so arranged ing and air control in the mile and than the air of the cities above. a quarter long international auto- The ventilating design is based that any part of the equipment mobile tunnel that will connect on data obtained in the Holbind may be operated from either the

Windsor, Detroit and

Canada,' and Alameda tunnelR,

American or Canadian side, ob-

That one requirement that is under the Detroit river.

A fresh air duct extends under viating any likelihood of a power As the giant ventilating towers the floor section with the foul air breakdown affecting the ventilat-first of all in both automotive and airplane engines is reliability. arises on each side of the river, duet between the ceiling alab and ing systoni.

Each ventilating tower, will have Once the factor of reliability is the first outward evidence becomes the roof of the tunnel throughout apparent of the struggle against the greater length. At the outer 5,000 gill-like glass openings for cared for, however, the following nature for more than a year. The sections of the tunnel, fresh and the admision of fresh air to the factors vary in importance.

What is demanded of a good au- $25,000,000 tunnel will be opened vitiated air is carried in passage-blower aystem.

Work on the tunnel has been Lomotive engine in order of Impor next fall

ways above the roadway, the fresh'

divided into five sections. Section tauce includes reliability, quietness, It will be the world's first" inter-, air being led from its passage- national automobile tunnel, and ways down the side walls and re-1 and 5 are the usual box type of flexibility and smoothinces, fuci will rank with the famous Holland leased from the tunnel near the way, with steel bents and cou- economy and Instly low weight per

crete jack arches, constructed by ] horsepower,, tunnel between New York City roadway level.

the open cut method," which is and Jersey City and the George Al In the ventilating bulding at

The order of requirements for the Posey tunnel connecting Oakland each end of the tunnel will be 19 used on both aides up to a depth aircraft engine is reliability, low economy, flexibility and smoothness weight and Alameda, Calf.

per horsepower, fuel

and lastly quietness.

}

giant fans, six blower and six ex Sections 2 and 4 were constructed of 53 feet below street surface. It has a roadway of 22 feet and, haust, The freal air is pumped by the "tunnelling shield method" an estimated capacity of 1,000 into the tunnel and emitted along and extend from the box type sec- vehicles an hour in either diree side the roadway at about the level tion to approximately the harbour tion, being limited to this number of the ordinary automobile ex lines on either side.

No motorist could stand the noise by the formalities of customs re- häust. Suction fans operating Section 3, the river section, is of the airplane engine underneath gulations

through the upper duct draw the being constructed by the trench his motor car's hood for any length The tunnel is 5:135 feet from foul air in through openings Infand trémie method," using pro- of time. In order to muffle that portal to portal. It is 45 feet be the ceiling slabs. It is conveyed viously constructed tube sections poise, however, he has to sacrifice through these ducts and returned sunk in a prepared trench. The just those constructional features to the atmosphere through stacks steel tubes were lined and partly that go to make up low weight and In the ventilating building.

encased with concrete before sink-reater sturdiness in the airplane

engine, with increased power, ing..

low the channel water level.

Pure Air Assured.

#

New jirablems of tiår purifica- tion and ventilation have been met

Change Every 90 Seconds,

The river section consists of Cast iron cylinder blocks and and conquered in planning the „Approximately one million cubiej nine steel tubes with an inside heavier pistons and connecting roda tunnel and engineers are confidant! feet of wir will be required. af diameter of 31 feet heavily rein-make for a quieter but much that air in every Tection of the minute under maximum operating forced.

All motordom

HUDSON

**PEK

ESSEX

SUPER

109-412

SIX

has turned to Essex

From cam of every price and size, motorists are selecting Essex the Challenger as their next car. In speed, performance, beautiful colours and economy, this fine Super-Six compares with care costing far more. With 7 body styles to select from, riding case and features usually found only in costly cars, Essex the Challenger bids you pit it against anything that motordom has to offer. We will gladly place a car at your

command.

ESSEX the CHALLENGER

THE CHINA MOTOR SUPPLY CO.

28-28A, Des Voeux Road, Central,

Telephone C, 1558.

Branch Office:--486, Yai Tak Road, Canton.

heavier engine. And since a mini-: mum of weight is demanded for air transportation, quietness is sacri- ficed there.

The result is that the airplane engine can supply one horsepower of energy to only two to three- pounds of its weight, while the au- tomotive engine weighs ten pounds to the horsepower.

The wide range of power require ments needed for travel on the highways, where there are all sorts of hills and varying traffic condi- tions, is not needed in the air. So as flexibile an engine as we use in our autos is not necessary in the airplane. The speed range for the alveraft engine is much more limit- ed than that for the auto engine.„ It would never do therefore to put an aircraft, engine into oor cars and try to move along in traffic, even though some way were found Lo minimize its noise, For just 28. noun as we tried to throttle down, the engine would set up a vibration. that would shake our car and bodies topleves. The airplane engine' is vibrationless only within certain | narrow limits. The automotive ́en. lue is vibrationless practically within all speed ranges,

This flexibility is attained, how- ever, at the cost of more economical fuel consumption, for the higher the speed of the motor the more fuel we have to burn. Since there is no need for a varying speed engine in alreraft, the carburation is fixed for most economical operation at a certain definite engine speed,

•

The aircraft carburetor, besides being set for definite speed limits, also has to have a compensating de- vice for quick variations in altitude, which is not needed in automotive ongines.

Double forced lubrication also is essential for airplane motora; with a pump foreing off into the engine and another drawing the return. oil back to the source of supply. That's positive lubrication, which is not so essential in automotive plants where there is an extra supply of oil-underneath.

RADIO MODELS.

Future Fittings.

A new corporation, to be known as General Motors Radio Corporn- tion; has been formed and will ex- ploli its patents inbadio sound and picture receiving and reproducing apparatus,

**"As well as making seta for homo

se, the corporation wi manufac Jure sets for cars, the designers of the Cadillac and "Lo Safle having allowed for this in the Intent models.

SATURDAY, JANUARY 25, 1930.

NOISELESS CARS.

Designers Aim.

NOISE MEANS WEAR

WATCH THE YOUNGSTER.

BUS GAIN LARGE,

According to a report from the A. J. Brosseau, vice president National Safety Council, U.S.A.jof the National Automobile Gham- 425 boys and girls of school age ber of Commerce, points out that were killed in motor velífélo sécï"[public motor bus transportation? dents throughout the country during the past five years in- during September,

creased 44 per cent. During this Iperiod motor vehicle taxation-in-! ||creased' 82 per cent, ·

The campaign against noise con- Unges in the automobilo factories.] Screeching brakes, gronning gears, Moving parta, are being made to and engines that seek audible self- closer tolerances. Forced lubrica

arc taboo expression

among tion Insures a cushion or bath of there is a distinct trend toward the designers, not merely because the oil where formerly a mist of oil reduction. of noise, but it is a by- lady in the back seat dislikes their churned up in the crankcase was product of more efficient production sound, but because nolee is redeemed sufficient.

rather than a studied effort. Paris cognized as a signal of friction and There is one obstacle, however na heavy as engines and complete attendant wear.

It is not impracticable to turn out bodies are moved silently by con Henry Ford's goal, it is said, is a noiseless car, but it is impossible veyors and materials-handling to produce a totally silent car in sto produce noiseless drivers. systems, frequently suspended from "Noise means bad design," he is to be blamed on the drivers. Brakes Crankshafts and camshafts still quoted as saying, "The agonor the that screech their protest when are hammered out by a mechanical- silent car, the sooner the perfect the lightest pressure la applied are evolution of the village smith's automobile. Wherever there is really reproaching their manu-strong right arm, but increasingly friction, there is wear. When we facturere. Yet most of the screech-other, forged steel parts are being realize that noise actually meansing, at "stop", streets waste of material, labour. and from locked wheels and consequent The staccato of the punch press results formed by pressure, which" in noing, money wo shall do something." friction between, tyre and pave-and the rumble of the forming

In other automobile factories mentan indictment efforts are being made to reduce the against the driver

wholly press appear an inevitable" con- comitant of steel meeting steet

silent factory.

Yet not all noises now heard are ceilings.

shricks and scrapings of machinery. Within the factories themselves swiftly and surely.

FOR ALL CLASSES OF

MOTOR

INSURANCE

7:

WRITE

FOR OUR PROSPECTUS

China Underwriters, Ltd."

HEAD OFFICE Hongkong Bank Building,

ta Den Vosuz Road Central,

· Tel. 0. 1121—22,

The NEW

The

Silvertown Tyre

Balloon That

extra

heavy

Cives

More

Miles and

BETTER SERVICE

ALL SIZES IN STOCK Next time TRY GOODRICH

Sole Agents for Hongkong and South China:

THE CHINA MOTOR SUPPLY CO..

28-28A. Des Vœux Road, Central,

Telephone C. 1558,- Branch Offico -486 Yat Tök Road, Canton.

Marquette

DELIVERS

ADILT

BUICK

PERFORMANCE

THAT ONLY BUICK BUILDS

Into the Marquette, Bulck has built an extra margin of every quality that mokas- an outstanding leader. On the road the brilliant performance of this swift, smart new six is unmatched by that of any offer car of comparable price. Nowhere in the thousand-dollar field can you find such thrilling responsay such effortless speed, such big reserves of power."

Only Marquette with its pricaines lock- ground of Buick craftsmanship can offer such superlative performance at moderate cost: Only Marquette in the thousand- dollar class has an engine of 2118 cüblic inch piston displacement. Marquette alóns provides the extra endurance and, sol- traordinary wodziowy of Buick alone knows how

And this

114" Wheelbaas Karquettë Models 11£* Wheelbase Euick Modela...

124* Whoalbass Buioc Models...

132 Wheelbase Buick Models...

more to offer than supreme performance and economy! In its class, Marquette is the only car with the remarkable new waterproof, dustproof, wearproof upholstery and the wonderful new non-glare windshield. A host of other exceptional · features contributes to The completenessi Dustproof; Illl-ray head. lights. Four Lovejoy hydraulic shock absorbers., Big, smooth, fully-enclosed brakes. Airplane-type stepped-size bedr Ings. A completely sealed engine. Beauti ful, harmonizing finish, Inside and out Perfect Ättings and appointments.

Hem l one of the smartest cars on the road... setting the style with new, low swung, foullesdy tailored Bodies by Fisher ...and providing performance unmatched a tha modarata-prica fald. Sea il-diles

■ Marquette today and know why" The world, la saying: "A GREAT PERFORMERI"

G$1,470 to G$1,600- G81,800 to GS1,940

652,240 to G$2,275. 082,195 to 082,800

THE DRAGON MOTOR CAR CO., LTD.

Telephona Central 1246 or 1247,

33, WONG NEI CHUNG ROAD, HAPPY VALLEY.

WHEN BETTER AUTOMOBILES ARE BUILT... BUICK WILL BUILD THEM

Page 15Page 16