. Principles and design of aëroplanes . ower necessarv_ weight(lbs.) Xvelocitv() - 2000 ~~ On planes the centre of gravity should be \ the width of the plane in front of its curves the centre of gravity should be -J the width of the surface in front of its centre. 36 CHAPTEE IV. Motor and Propeller. The desideratum in respect of a motoris of course a minimum of weight fora maximum of power. In other words,the ratio weight of motorpower should be as small as possible. Therecord values are as follow: Per , lbs. ) Antoinette Co., lbs. V PetrolWright Bros., lb
. Principles and design of aëroplanes . ower necessarv_ weight(lbs.) Xvelocitv() - 2000 ~~ On planes the centre of gravity should be \ the width of the plane in front of its curves the centre of gravity should be -J the width of the surface in front of its centre. 36 CHAPTEE IV. Motor and Propeller. The desideratum in respect of a motoris of course a minimum of weight fora maximum of power. In other words,the ratio weight of motorpower should be as small as possible. Therecord values are as follow: Per , lbs. ) Antoinette Co., lbs. V PetrolWright Bros., lbs. ) Maxim, lbs. Steam. These values are, as far as is known,found as follows: weight in lbs. -^ = ratio. , There will, however, be a certain lossin the transmission meqhaiiism. In tfyelight machines at present employed thiswill only be small, but in all oases theloss at the propeller is serious. P?Q-fessor Langley obtained an efficiency y6£50 per cent, for a common type of aerial!propeller, and his value is frequently ap-j. Fig. 2. AERONAUTICAL MOTOR. The Gnome Rotary Engine. 38
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