06-24-2008, 02:40 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 -- Ephemera
Now that I'm getting back into the design and build swing, I thought about another open-frame design to get one's teeth into. I think Ephemera does this well. RockSim says it has a 1.36 static margin with a C6-5, so if the calculations are correct, this should be a rock-steady bird.
Length: 30.50"
Diameter: 1.04" (ST-10)
Fin Span: 7.88"
Weight: 1.79 oz
A8-3......140'......Dv 17 FPS......48" x 3/16" rod (req LL-3 lugs)
B4-4......355'......Dv 10 FPS......36" x 1/8" rod
B6-4......360'......Dv 5 FPS.......36" x 1/8" rod
C6-5......800'......Dv 6 FPS.......36" x 1/8" rod
Skin the fins for strength, and it should hold up to repeated landings. I simmed with a 16" parachute, so the landing V would be low.
Enjoy!
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