05-10-2005, 11:39 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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Quote:
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Originally Posted by CPMcGraw
I need to sim up the short-body version with this booster, but I still think the stability is OK. At the very least, the short-body version might need some weight added, but probably not much. The original Cherokee-D is a very stable design as-is...
Craig...
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OK, the sim is in! (AGAIN) 
In fact, if you've already read this message once, I've updated the RKT file. Found something out that I didn't notice before, and had to correct it. The design is NOT naturally stable in two-stage mode, and DOES need some weight in the nose (0.25 oz at the tip). This gives the full-up rocket a 1.0 calibre margin.
The new RockSim 8 [Beta 3] gives me a 2155' altitude for this bad boy, using a D12-0/D12-7 combination. This is for the LONG-BODY version. Deployment is within a foot or two of apogee! 
I'd say this confirms the stability of the (corrected) design... 
ZIPped RKT file is attached...
Craig McGraw |