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Aviation History
1912
1912 - 1152.PDF
I/PGHT DECEMBER 7, 1912. TESTING THE THRUST OF SCREW-PROPELLERS FOR MODEL AEROPLANES. By C. T, THE accompanying drawings and description relate to a small machine that I designed and constructed for the purpose of testing the thrust and efficiency of "various sizes and shapes of elastic-driven propellers for model aeroplanes. Although I have not done much with it so far, it may be of interest to the readers of FLIGHT, and perhaps useful to some who wish to make similar experiments. It is capable of taking pro- MACHINt POLLIT. a loose one secured with a sleeve for carrying the other end, The other end of the rod is fitted with a sliding head with hook and can be adjusted for various lengths of elastic. This rod is supported on two pairs of rocking levers ; the rear ones being extended below the point of support to take a balance weight, which is approximately equal to the weight supported by the levers. FOR TESTING THE. THRUST OF SCREW PROPELLERS FOR MODEL AEROPLANES •T C. T. PoLUT. 16 j5Ti.NBi_eaiLi9,<t_i!e.'?*ij*s?ui!!i-£^4LD£.. II Ij <orol GEARING FOR WINDING UP PROPELLER. CLOCKWORK MOTOR FOR DwviNO DRUM fj FOR »TARTIN« % 3T9PPIN6 FflOTOH STPiPU-E.. ___ Wr,i*nr (ABOUT 1^: LBSJ foR ORIVFN& MftTOft. I I I I T _r_ 1.4 IS ~i r pellers up to I ft. or more in diameter, and a length of elastic up to 2 ft. : the thrust limit is up to 5 ozs. as at present constructed. >C«1_E OF A connecting-rod conveys the thrust of the screw to the lever with spring attached to it near the bottom ; the amount of thrust being indicated in ounces on the scale at the top. RULED PAPER FOR TAKING DIAGRAMS or THRUST AND DURATION OF REVOLUTIONS OF SCREW PROPELLERS FOR MODEL AEROPL.AN.F_S. 8V c.T.fw,T. ?<; 4|^ A 3,: I i 1 "HP —i— -1- ;: >T _)_ J_ •1 •: 1 •- 0 «S K 0 " i N 3 1 S 0 r- ~j-1 ___ •4 O ... .1 3 - 0 2 O ~ 1 0 1* •) The drawing is an elevation of the machine, from which the construction will be easily understood. The f in. square rod, 2 ft. 4 ins. long, is litted with a brass angle-plate screwed on to one end, for carrying one end of propeller-shaft, and 1152 n,,s)l H • Ka 1?0Se iever which remains whefe ^ bas been £_« 11 T * A °.Wing ? maximum amount of thrust. This whin nl 1 frSV -1 wound UP the motor with the finger, winch not only took time, but was very tiring work. So I
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