. 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 . e with thenormal to the surface of the order of V. The horizontal force on an inclined plane equals the head resist-ance added to the drift, or horizontal component of the normalpressure : the vertical force consists of the vertical component ofthe normal pressure on the plane. Several determinations of the variation of the pressure on squareplates with the angle of inclination have been made, of which themost important results are th
. 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 . e with thenormal to the surface of the order of V. The horizontal force on an inclined plane equals the head resist-ance added to the drift, or horizontal component of the normalpressure : the vertical force consists of the vertical component ofthe normal pressure on the plane. Several determinations of the variation of the pressure on squareplates with the angle of inclination have been made, of which themost important results are the following : — Note,—P« = Normal pressure on plane set at an angle to aircurrent of a°.Py^° = Normal pressure on plane set at right angles to aircurrent. TABLE OF EQUIVALENT INCLINATIONS Rise. Angle in Sine of in 9 Angle in Sine of Degrees. Angle. Degrees. Angle. 01111 1 in 30 1-91 0 0333 6-38 1 ,,25 2-29 0 04 1 ,, 8 7-18 0 125 1 „20 2-87 0-05 1 51 7 8-22 0 143 1 „ 18 3-18 OOooo 1 ,, 6 9-6 0-1667 1 „ 16 3-58 0 0625 1 ,, 5 11-53 0-2 1 „ 14 4 09 0-0714 1 „ 4 14-48 0-25 1 „ 12 4-78 0 0833 1 „ 3 19-45 0-3333 1 „io 5-73 0-1 ... 1. m eori 40% ^2oa ^\l 20° 40° 60° 80 An^/e of inclination fo air current Pressure on Inclined Square Plates (Dines). 10° 20° 30 40° (C of inclination to air current Pressure on Inclined S-j^uare Plates (Langley).2 17 i8 AIR PRESSURE AND RESISTANCE [div. 1 The following tormuUc have beeji j), most of them bein^l)ase<l upon the experiments of the author of the formula :— S<nARE Plates PaP90 Beconiei?for SmallAngles?. 2 sin a, Authorit.\. 2 sin a Duchemin This agrees closely r+sin^a .u-2a vnth Langleys ex-periments. 2 sin a-sin a 2 sin a, Renard Based on Kenards or 2 a experiments. Sin 2 a, A\hen a is not sin 2 a, Institut lie Based on experi-ments of Riabou- greater than 45° oi 2 a Koutehino (•hinsky. 1, when a is greaterthan 45° J5 „ -, when a is not a30 Eitiel Based on originalEiffel Towe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectaeronautics, bookyear
