. 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 . # L # W^ W/^ ^ 1912EI w per foot run. 54 AEROPLANE DESIGN [div. II SpringsPlate Springs.— \y = n?^f. = ^2E^=-Spiral ^^ = ^^- ttCW^ ■ Where W = total load, /> = breadth of plates,^ = thickness of = number of plates,/ = length between buckles,/i=::length of wire in spring,y—maximum fibre = deflection under load W,(/ = diameter of wire,T) = diameter of coil. The lightest form of spiral spring is that made
. 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 . # L # W^ W/^ ^ 1912EI w per foot run. 54 AEROPLANE DESIGN [div. II SpringsPlate Springs.— \y = n?^f. = ^2E^=-Spiral ^^ = ^^- ttCW^ ■ Where W = total load, /> = breadth of plates,^ = thickness of = number of plates,/ = length between buckles,/i=::length of wire in spring,y—maximum fibre = deflection under load W,(/ = diameter of wire,T) = diameter of coil. The lightest form of spiral spring is that made of thin circulartubing, which has almost twice the resilience of a solid wire springof the same weight. Moreover, the resilience of any given materialis greater in spiral spring form than in any other form, for thesame weight. Shafts T = (s?olid shaft).lb Y = — -^^Jzi^f (hollow shaft).16 d Where T = torque applied to shaft, cZ = external diameter of shaft,rfi = internal diameter of shaft,/= extreme stress. Thin Cylinders. Pipes Greatest stress is given by 1 —J^-.^ ^ • -It Where ^> = internal pressure. ll)s. per pijuare inch, rf = diameter of pipe,^ = thickness of pipe. Pi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectaeronautics, bookyear
