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Aviation History
1923
1923 - 0211.PDF
APRIL 19, 1923 ism "FLIGHT" GLIDER DESIGNING COMPETITION Identity of Successful Competitors As announced in last week's issue of FLIGHT, the envelopes containing the names and addresses of competitors in our designing competition were not opened until Friday of last week—by which time FLIGHT was distributed and in the hands of our readers. Consequently, neither the judges nor the Editor knew who were the authors of the winning designs, and the judging and final award were not, therefore, prejudiced in any way. The announcement of the awards -having been made, the envelopes were opened and the identity of the winning designers ascertained. " Turkey Buzzard " was designed by Messrs. Roy G. Miller and D. T. Brown, of the Naval Aircraft Factory, Philadelphia, Pa., U.S.A., and " KL" by Mr. R. J. Ashfield of 180a, Cheltenham Rd., Bristol. Cheques have been dispatched to the winners, and we take this opportunity of thanking all who have participated in the competition for the great deal of trouble taken and the amount of work put into most of the designs submitted. When we have finished publication of the drawings of the winning designs we hope to publish drawings of some of the more promising but unsuccessful designs. - - ^ - "TURKEY BUZZARD" TURKEY BUZZARD AEROOrNAMlCAl - Lc -IZO -too •wl - 60 -40 -Z0 / 1 / > t / / f y / / / / s / / V , / - / /\ / J A \ / / \ / / / J \ / 11 \\ 11 s 1 1 / \ f JZ 10 8 6 4 I -i — 1 /D •0 8 • 4 -12 • 0 9 • S t- -2 0 2 4 6 0 10 It 14ANGLE Of ATTACK (DtGKteS) 3 *** VJ1 !• 0 s '.0 -JO t 1 is 1 ft 0 \ \ 1 \ \ 1 \ s 1 1 TURKEY BUZZJftD GLIDING /IMCie rs /I/ft SP££D GROSS tf£/G/IT -253 t-B A'REA 'I7Z 30. fT. —' | y y n / ! / 1 TURKEY BUZZARD " : Aerodynamic characteristics and gliding angles. ii -£• 0 e 6 g w n/4 6OTT/NGEN NO 426 Lc AS resrca (A//-S).18 .25 .32 .39 46 .53 .59 64 .64 < CORRECTED ifi.R'fO7) .eo .2B .je .44 .se .60 .66 .7! T/MES /38 zre 39.6 43.7 60.7 71.7 818 31.0 99.3 99.3 Dc ASresreo (A.R.*5) .010 .013 .019 .oe5 .033 .043 054 .066 O84 conitecnD (ARM7) .0082 .0106 .o/ee O2IO .0e76 .0352 .0438 .0552 0632 TIMES /3S /.I32 /.490 ?.?35 Z.90 3.81 485 6.05 7.61 9.40 SLOANE t-c AS TESTEDfA.ff.-6) .0/0 .095 .19 .27 34 .40 .45 .50 .53 CORRECTED (Aff-/0.7) .015 ./oe 203 .292 .370 .440 .490 .SI 6 .546 T/VfS 34 .SI 3.47 &90 393 /2.60 14.97 16.67 /7.S5 Z8.57 ASTtrsrcD Mfl.-ej .006 .005 .008 .013 .oee .033 .050 .073 CORRECTED (A.ft-IO.7) .00515 .00429 .00687 .01/2 .0/92 .0288 .0422 .0640 ,/OZ .0867 TIAtfS J4 .175 .146 .234 .38/ .852 .373 /43f 2. IB 2.95 TOTALS Lc 28.11 42.07 56.60 70.63 84.30 97.77 707.67 lisas //787 Dc 1.307 1.636 2.469 3 28/ 4.662 5.828 7.484 3.79 12.35 A r.4934 .8064 2.1354 29634 3.7804 5.16/4 6.3274 7.9834 /0Z894 128494 IS. 6 13 7 19.1 /8.7 16.4 15.4 13.5 11.4 B2 TURKEY BUZZARD " : Scale corrections, etc., for the~aerodynamic characteristics of the wing. THE general arrangement drawings of "Turkey Buzzard " were published last week, as were also those of " Kjj". In the present issue we publish the performance calculations for " Turkey Buzzard," and the constructional drawings of the fuselage. In subsequent issues it is proposed to give the constructional drawings of wings, tail, undercarriage, etc., and when all have been published we hope to commence the detail drawings of " Kjj." Performance Calculations The following performance calculations accompanied the design for " Turkey Buzzard " :— The Goettingen 426 aerofoil is used over the middle 14 ft. of the span. (The thick section is carried one ribTstation beyond the parallel portion of the wing to relieve the'abrupt bend in the flanges.) Chord of parallel wing = 75 ins. -;.-. Chord of wing at 7 ft. from the centre = 72 inches. 75 x 12 75 + 72Area of Goettingen 426 = —~ 1 —— =87 sq. ft. 12 ' 12 tapered down toThe balance of the wing iscurve at 1 ft. from the tip. Chord of Sloane curve = 48 ins. Area of tapered portion = 172 — 87 =85 the Sloane sq. ft. 211
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