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Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

Forfatter: Guilford L. Molesworth

Sider: 744

UDK: 600 (093)

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547 OF ENGINEERING FORMULÆ. ORDINARY DIMENSIONS OF WINDMILL SAILS. Length of whip . Breadth of base . Depth at base . Breadth at tip . Depth „ . .. 30 feet. .. 12 inches. .. 9 •• 6 • • 4i „ HORSE-POWER AND SAIL-AREA OK WINDMILLS. HP — Horse-power. V fs Velocity of wind in feet per second, A = Total area of sails in square feet. N — Number of sails. HP 1080000 HP = - A V3 -. 1080000 * e i. •! A Area of each sail = — • jN Velocity of tips of sails = 2-6 V, nearly. Coefficients for Eefi.i x of Air from Orifices. Vena contracta ..................'98 Conical converging. .............'9 Cylindrical rounded at ends .. • 9 Cylindrical throughout .. .. '8 Thin plates .. ...............* 6 Centrifugal Fans. D = Diameter of fan. V = Velocity of tips of fan in feet per second. P — Pressure in lbs» per square inch. V = V P x 97300. _ V2 P ~ 97300 ‘ 2x2
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