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Old 04-20-2006, 12:22 PM
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CPMcGraw CPMcGraw is offline
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
Exclamation New Plan -- MARK III

Another basic 3FNC, but drawing on that compound fin step discussed earlier. I was looking for simplicity, as well as performance. The silver-color bands are an optional trim using cardstock; but silver automotive trim tape could be used instead. Solid black overall. Give it a high-gloss finish.

This design should be a good flyer for your collection of "usual suspects"...

The deployment velocities are at the high end when using the B4 and C6 motors, but not excessively so. You might reef the shrouds when flying with these motors. The A8 gives a nice flight with a gentle deployment at apogee for small fields.

All three motors will reach safe flight V in the length of a standard 36" rod.

A8-3......238'......9 FPS.....595 FPS/S
B4-4......569'.....26 FPS.....750 FPS/S
C6-5.....1250'.....27 FPS.....766 FPS/S

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Craig McGraw

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