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Aviation History
1919
1919 - 0441.PDF
LIGHTER-THAN-AIR CRAFT By LIEUT.-COL. T. R. CAVE-BROWNE-CAVE THB lecture under this title, delivered on Wednesday of last week by Lieut.-Col. Cave-Browne-Cave before the Roy 1 Aeronautical Society, was extremely well attended, and was followed with the greatest interest by the audience. Brig.- Gen. E. M. Maitland, D.S.O., R.A.F., was in the chair. The paper itself was published in last week's FLIGHT, but un fortunately the illustrations did not reach us in time to be included. We have since then received copies of a few of the excellent slides illustrating the lecture, which we now publish. Many of the other illustrations would have been of great interest, but possibly the Censor, who is not yet de mobilised, considered it inadvisable to have these published. The Discussion During the discussion which followed the lecture. Col. Cave came in for a fair amount of critici m, some of his critics being of the opinion that he was a little optimistic where the non-rigid type of airship is concerned, and ex pressing some disappointment with the somewhat sketchy nature of the part of the paper dealing with the rigid type of airship. Mr. Cole, the well-known airship designer, said that although the lecturer had stated a very simple formula for the lift oi an airship (Lift = V (Pa — P«), where V = volume of gas space, P„ = density of gas, and Pa = density of air displaced), it was not such a simple matter to apply the formula, as the hft of hydrogen varied greatly, some experts putting it at 70 lbs./cu. ft., others at 68, while the lecturer had put it at about 64 lbs./cu. ft. As regards the percentage of lift obtain able with the two types, Mr. Cole thought the lecturer was optimistic with regard to the non-rigid, and considered that a carrying capacity of 50 per cent, of the gross hft was too high for the non-rigid, he personally being more inclined to put it at somewhere about 38 per cent. ; while for the rigid type the disposable hft could be placed considerably above 50 per cent., and the Germans were understood to be con templating the possibility of a disposable hft of between 70 and 80 per cent. May Pritchard, who was stated by the Chairman to have had very extensive experience in piloting of airships, said that there was no use in comparing the two types unless due consideration was given to speed. If this were done, he said, it would be found that by the time the non-rigid had been ® ®<S> © ® 9® ELEVATE*. BunayB capjary ottmvtope. TOOOO C* Ft • BaHonttt. tMOOCu rreocn Overall Length of envelope. 1*3*' • might ground to top oflnveJope -.47-0' Width 39-t' Ucnumum Speed. ..SiMPH InomeelHPemmberofX---- I 7SH.PRatsRoyci C~m. A otscHipnow. BOW VIEW. I envelope t nose stitrenrva 1 Bollonets 4 Craboots t Ripping Ponel • Ripping Card 7 Trrcmo Line • TaedoaMi** » Tap Valve Cord n Bottom Ooa ttrtur H Outr, air Valve C Suspension ali-TQ- Guys Aiys fflotver Pipe Mumtf Blower Pipe Trail < Oraonei Hope Car- Borne Leva* <X*r Petrol Tank Hnriz£mrai s Elevator Planes Vertical t Rudder Plane 'SS*AttSHP~Z"TYP£. ARRANGEMENT OF "N.S:AIRSHIP ) feVZR BAUAST BAG. D MTEBW mam. )Pov& urn )F10AT5 )0wmn CABINamm mamas. ) raw s oeAFm mm. )/mvc WKS H.VNO usee sws<rr. )BAUcnrzs TYPE W 7-I8 axw (AmoTY OF amion OKHAU WmH CHSrUl HtrVfT OH&IAUWBTH fMHMtS ffrt f ft?) MAXJMIM JAfZP xoxaoa/T za-v &• sir B0t/BA««)ON. LIGHTER-THAN-AIRj CRAFT: Two illustrations from CoL Cave-Browne-Cave's lecture 441
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