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Scratch 2 stage

I'm building a 2 stage rocket with a stage coupler behind the fins. What does having the motor's nozzle 4 inches behind the fins do to the CP and it's relation to CG? I've used the calculations at

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to calculate the rockets CD but it ignores any airframe behind the fins so I was wondering if anyone might have an idea or link?

Thanks

Layne

-- L & K All incoming and outgoing email scanned by Norton Antivirus updated daily.

Reply to
L & K
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Try downloading VCP and using that. It is a pretty good program and will be able to tell you the effect on CP and CG (presuming you get the weights right).

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L & K wrote:

Reply to
Richard Hubbard

Thank you Richard I'll try VCP.

Reply to
L & K

There used to be an L&K Motel IIRC around the time of LDRS-1.

Jerry

Reply to
Jerry Irvine

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