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Old 05-14-2013, 09:09 AM   #4 (permalink)
kach22i
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Quote:
Originally Posted by freebeard View Post
...or you could search on 'fineness ratio', which describes the number you are looking for.

Essentially 2.5—>4.
Yep, from what I recall the aero-shape ratio of width to length of free air verses close proximity to the ground goes from roughly a 1:3 ratio to 1:5 ratio respectively.

Read up on that thread ChazInMT posted, it's a good one.
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