Man's physical universe

xanabras

AIRPLANE A TRIUMPH OF MODERN SCIENCE 359

that they are about equally loaded at all

times, while an automobile

engine may be started with the clutch disengaged and then started in

low gear to prevent overloading while cold.

Certain airplane-engine parts are not fitted as closely as in automobiles

because more room must be left for the circulation of oil which

lubricates the engine and to some degree cools it.

FLYING PERSONNEL

50,000 men.

OTUfI?

MILITARY PERSONNEL

t f f (f

26,000 AEROPLANES REWIRE

IN ONE year:— « t i ii

AICCRAH^

acce;;obie;

INDU5TRY

2.MO.00O

(neik

FUEL

AUXILIARY INDUSTRY

ttiitfttfitttt

ttHMtHtiitHt

tHHHff (Utttttt

£ACN SMALL FICUJ?£ = es.OOOMCA/

£ACtJlAec£ r/Cl//Pf ' 300, OOO M£N

£ACU TPL/C/{- SO. OOO M/llX/AY

TffUCk-S Of /S rO^S JTACA/

Fig. 152. From such charts one gains a clearer understanding of why war

forces enormous costs upon nations. This chart appeared originally in the April

5, 1940 issue of The Aeroplane, London, and was reprinted in July by Mechanical

Engineering. We are indebted to the latter for the privilege of reproduction

here.

The density of air at an altitude of 21,000 feet is only half that at

sea level ; consequently the power of an engine falls off rapidly with an

increase in altitude because less fuel can be burned by the same volume

of rarefied air. This difficulty is compensated for by the use of a compressor

(supercharger) run by the engine, which supplies air to the

engine at pressures approaching the pressure of the atmosphere at sea

level. The air is heated due to compression and turbulence within the

supercharger, and it should, therefore, be cooled before it enters the

engine.

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