04-22-2007, 08:42 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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Revised Plan -- Andromeda Mk VIII
These alterations are based on the performance of the Mk I prototype yesterday. It flew well, but not to my satisfaction. Granted, it was a much heavier model than I thought it should be, and thus the stability margin was closer to the low end of the scale. Interestingly, the model did not need any of the small finlets around the base of the second shroud currently shown in the 3D images.
This version lengthens the model by 1.3", by using an ST-753 motor section instead of the ST-740 previously added. The model now has DV's for my selected motors that are close to ideal.
I've kept the small finlets in this revision for appearances, but RockSim says they do add a measure of stability to the overall total. Granted, we're finding out that RockSim isn't always correct in its assessments and assertions...
Length: 29.25"
Diameter: 1.04" (BC-760); 1.34" (ST-13)
Fin Span: 5.86"
Weight: 2.08 oz
A8-3......142'......Dv 10 FPS
B4-4......383'......Dv 13 FPS
B6-4......392'......Dv 3 FPS
Note the C6-5 is not listed. This motor does not achieve safe flight speed until 44" up the rod. All of the motors listed here achieve flight speed in less than 36".
Enjoy!
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