The Rocksim/Openrocket base drag trick

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RobVG

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In Apogee's Peak of Flight newsletter, #154, Bruce Levison shows us a way to compensate for stability calculation inaccuracies for short fat rockets.

He tells us precisely how to draw and add a zero mass cone to the back, but he says it's for rockets with less than a 10:1 length to diameter ratio. He goes on to say, "much less".

How much less? Is there a more concise mathematical definition of a "short stubby"?
 
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Banzai88

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10:1 or less is the accepted norm. Less would be all the way down to below 1:1, and that would make for an interesting odroc
 

DarthMuffin

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FYI, from my and a friend's experience using the base drag cone trick, it works. Actual flight results were slightly higher than with the drag cone, but nowhere near the estimate without (like maybe 20-25% of the difference between the two).
 
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