Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/407

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EXPERIMENTAL AERODYNAMICS.
§ 245
 
or,
or,
or, in poundals per square foot

the deduction .0015 being made, as in the last example, for ballast resistance.

Determination of constant

or,
but,
and,
or,

all quantities in absolute units.

Thus, for the determination of in any particular case the value of must first be obtained from the equations, the remaining quantities in the expression and being the area (sq. ft.) and weight (poundals) of the aeroplanes employed.

Example.—Planes 1 and 2.

Flight data as given.

By (5)  
where
A.F.
385
C C