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Old 03-17-2015 | 05:00 AM
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As the CD, and as there is no IMAA any more, it's really up to you.

The old guidelines were 80" monoplane wing span, 60" biplane, or true 1/4 scale. Jets were length plus wingspan = 140"

A fun example is a 1/4 scale F-104 only has a 65" wingspan but its 14 feet long!