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Aviation History
1917
1917 - 0009.PDF
JA-V'AHV 4, sea." This beats one of our own London Particular fogs, which are not cmifa so substantial as all that. -. • ., .-••••:v;- Well, I won't labour the point beyond saying the book is most interesting as an example of how not to. do it, and when I write my first book on aviation,- I hope I shall be as fortunate as the author of '' Air- craft " in finding a publisher, and not so unfortunate as he in producing a humorous work when on* of an entirely different type was intended. • By way of a " final " gem, how k the following ? : " A cricket ball thrown into the air could, by reason of its own momentum, continue on for ever, were it not for the resistance of the &iu\ which soon brings it dropping to the ground. - ~ "This same condition tpplfc* to the aeroplane, and more so." If gravitation was inoperative in the theory of the author's cricket hall, it was very much in evidence with regard <o his volume on W.I\B.; it Ml more so. its way to the like a ball—And WTJ approx. In a modern wing section such B. P. NTew Sonthgate). • '".''Voar question is not quite clear. You state that the weight of the • machine is 1,500 lbs. and the area 300.Obviously, therefore, the lift must be 5 II*. per square foot at any speed if the machine is to proceed on a horizontalflight path, i.e., neither ascending nor descending. We take it that what you really want to know is what lift coefficientwill be necessary for snch a machine to fly at the speed men- tioned of 40 ni.p.h. Since lift per square foot — C x 0-0051,X V*. where C is the lift coefficient, and V is the speed in ' xa.p.h., the required value of C is obviously^ C - lift ?£_•*>• h: 00051 V* HE —5„ „ 00051x40"a lift coefficient is quite possible, but scarcely at an angle of incidence of "3 degrees; more probably at about 12 or 14degrees. The lift at any other speed can be found by sub- stituting other values for V in the equation.A. H. C. (Golders Green). The weight complete of a 50 h.p. Gnome is about 170 lbs.Petrol consumption about 5 gallons per hour and oil con- sumption about l gallon per hour. The weight of a suitablemounting and cowl would probably be approximately 50 lbs. and the propeller for it would weigh about 20 lbs. E. E. H. (Kettering).We have heard of no recent experiments with Hertzian waves as utilised for counteracting the force of gravity. Youmight obtain some information on the subject from the editor of The Wireless World. Marconi House, Strand. C. A. D.W. (Maidenhead). z '"'"' V" ' _;,-V > You had better wait for a lew months and then apply for a commission in the R.N.A.S In the mmuiUme you should fitudy the subject a» much as posntbta, J. F. (Wakeheld). / • ;" You had better inquire of Major Mitchell, The t'olytw Imic,Regent Street, LOIKIOM, W.,.who is th* recruiting oil'trer fojrthe K.F.C., as to whether there are any vacnticu's m your trade at present. Tlianlcs for the photograph oi your mudcl,which we will use shortly. r * E. J. S. (Ttdworth). Ss ^ Those who meet with ncckfontt are not entitled to wemrthe gold stripe. You might be entitled to gratuity, but it U impossible to say without knowing the details. .. ;, A. L. G. (Kipon). *TThe- manuals you mention arc for official me only, and are not on »>ak- to the general public. J. J4 (Croydon). : .. :, -"•- « . •, Your age would almost certainly debar yon Irom obtaininga commission to the R.F.C., ami it is doubtful whether you would b: accepted as a mechanic. You should write to MMitchell, The Polytechnic, Regent Street, London, W. R. H. (Leicester).Apply to Adsmtral House, London, K.C., lac necessary form, and having rilled it up tend it in. Therearc no fees. If accepted you would be sent to one of the flying schools for training. It is impossible to *av how longthe training would take. THE BRITISH FORCES IN MESOPOTAMIA.—A seaplane base with its Monitor guards. 9
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