Equations
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Displacement                     = 1/2 dia of the bore x itself, x stroke 

Metric Displacement         = cu = cc x .061 cc = ci x 16.39"

Inches to cubic inches =(Bore x Bore x stroke) x .7854= displacement 
To get cc divide by .061. 

Propeller  Load Factor      = prop length x 2 + pitch

Speed                                   = rpm x pitch x .00095 - about 3% for drag

Unit conversions:

bullet1ft   =     0.3048m
bullet1in  =     2.54cm
bullet1lb  =     16oz 
bullet1oz =     28.35g
bullet 16oz =   0.4536kg
bullet1sq. ft = 144 sq. in
bullet Lbs x 2304=oz.
bulletsq. ft. = sq. inches x 2305
bulletoz. in a sq. ft. = lb in a sq. foot x 2304
bullet 

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