. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . ntre of plate Where .r= , — —t——. lengtli ot mclnied side of plate 22 AIR PRESSURE AND RESISTANCE [div. 2. ByThiesen— x = (y2 3. By Soreau— COS a1 +sin a* 1 4[l+2tan a] This formula of Soreaus agrees very well with tlie results foundby Langley and Dines up to an incliiiation of 20°, but is proljablyinaccurate for larger inclinations. •30 ^ A ^ o ^^ •25 •20 15 5 S -10 05 I 90 70° 50° 30 lO** 0 4nf>le of inclinafion to air current Ce
. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . ntre of plate Where .r= , — —t——. lengtli ot mclnied side of plate 22 AIR PRESSURE AND RESISTANCE [div. 2. ByThiesen— x = (y2 3. By Soreau— COS a1 +sin a* 1 4[l+2tan a] This formula of Soreaus agrees very well with tlie results foundby Langley and Dines up to an incliiiation of 20°, but is proljablyinaccurate for larger inclinations. •30 ^ A ^ o ^^ •25 •20 15 5 S -10 05 I 90 70° 50° 30 lO** 0 4nf>le of inclinafion to air current Centre of Pressure on Iiifliiicd Plates (Rateau). Div. l1 PRESSURE ON INCLINED SURFACES ^3 The following taV)le will show to what extent ditterent authtnitiesatjrce: — 1 Formula. Experiments. 1 j Joessel. Soreau. Dines. 10 - -20-5 -45 - 78 - •247•197 •088•006 •185•143•083•024 200 •125•075•0-20 1 •146•083•021 Pressure en Inclined Curved Surfaces.—The earliest experi-ments on this subject were those made by Lilienthal. The camber of hi^^ aerofoil was _: liis resiilts are shown in the eni-^e 0* 10° 30* 50° 70° Pressure on an Inclined Aerofoil (Lilienthal 90° 24 AIR PRESSURE AND RESISTANCE [l>iv. I Eiffel i-xjjeriniento(l A\itli a eurved ])lane of oamlter —-, span 90 cm., chord lo cm., giving an aspect ratio of (i. Tljo rurve belowshoNvs bis results.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectaeronautics, bookyear
