scale ?

[eod20]

 
   for those of us - me - that are math challanged
 
    what scale is a pop can mortar in relation to a real 10" mortar, i mean if the real bore is 10" and the pop can is 2.75ish and the muzzel diameter is 27.5 what would the pop can scale size be
 
    i ordered a set of plans from AOP just waiting for the mail and am working out my scales i am thinking of 2.75 or 3.63 as my deviders for a sled length of 27.07 or 20.52" respectively - but i do not know which would be proper scale for a 2.75 in bore.

[GGaskill]

Divide the model bore size by the prototype bore size.  In this case, 2.65/10 = .265 which is easy.  Multiply all the full size dimensions by .265 to get the model dimensions.  A 27.5" muzzle would be .265 x 27.5 = 7.287 which is a hefty piece of steel.

[Double D]

A popcan mortar with proper windage needs a bore of 2.667.
A Diet Coke can is 2.6 inches in diameter.  (2.6/39)x40=2.667


Do you know how to do excel spread sheets? You can do this real easy with that.

Other wise just divided your full scale bore diameter by the diameter of your popcan bore.

10/2.667 = 3.75.  Divide all full size dimensions by 3.75 to get your scale dimensions.