Rule of Thumb for Tube fin Length and Baffle Length

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El Cheapo

Well-Known Member
Jan 20, 2009
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Tube fin Length to BT width?

Baffle Length for zipperless? I can't remember if it it's 2x or 3x diameter per side.

I'm working on a roughly 2.15" scratch tube fin bird to fly on 29mm power from G to L1 capability with zipperless mid-break design. Total Length, 54" including 11" scratch conical nose cone. The four tube fins are oppsoing 45deg angle cuts like the FSI viking. Total Length 10" with 5.5" being tube. the rest makes up the 45deg angle cuts. Total weight should be around 18oz. This is very heavy tube at .090 width.