05-22-2006, 09:27 PM
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BARCLONE Rocketry
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Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
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New Plan -- Star Seeker
I like these open-style fins, and have tried to use this idea since doing Lil' Battle Axe. It's interesting how the outer edges of the fins seem to have the lion's share of the stability attributed to them, while the inside area of the fin just adds extra weight (and, granted, strength). Use the SEMROC 20" parachute if the recovery area is large enough, but drop down to the 16" parachute when the area is smaller. You should have enough canopy area to keep the landing loads on the fins low...
Reinforce the outer surfaces of these fins with some label stock, or use regular computer paper attached with glue or 3M-77 spray adhesive. Once the paper has been sealed to the wood, you shouldn't have any trouble with the paper trying to lift.
The forward "fins" are just balsa supports for 1/8" diameter wood dowels. Epoxy these joints. Trim the front and rear ends of the dowels to match the angles of the supports.
Length: 24.98"
Fin Span: 4.95
Diameter: 1.04" (ST-10)
Weight: 1.77 oz
A8-3......160'......13 FPS
B4-4......385'.......7 FPS
B6-4......391'.......3 FPS
C6-5......825'.......9 FPS
All motors reach flight V in the length of a standard 36" rod.
Enjoy!
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