04-22-2007, 11:39 AM
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BARCLONE Rocketry
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Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
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Revised Plan -- Antares Mk II
Here's the updated plan for the Antares, based on Saturday's flight test. The updated construction uses the 6.5" BT-20D as the motor tube, and four support rings, to form an inner core. Applying glue to the two interior rings can be difficult at best, but if you use a straight pin (or a "T" pin) and pierce the BT-50 only where these two rings intersect the fin lines, you can flow some thinned yellow glue through the holes and "blind rivet" the rings in place. CA would work, too, but you need to keep excess CA from interfering with the fin root glue joint.
Length: 23.75"
Diameter: 0.976" (BT-50) main body tube; 1.325" (BT-55) reactor shroud
Fin Span: 8.08"
Weight: 2.38 oz
Recommended motor results:
B6-4......282'......Dv 17 FPS
C6-5......706'......Dv 7 FPS
The A8-3 and B4-4 (the two motors I chose to fly with  ) are not advised for general flying, as their Dv's are above my suggested 20 FPS upper limit.
Even with the weight of a C6-5 added, the stability margin is 2.73. No wonder the first prototype flew so well!
Enjoy!
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