02-19-2009, 07:21 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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Originally Posted by JRThro
How did the original design perform in RS 9?
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I had to go back and work up a Mk I version. Deleting the balsa fins and working with just the 3" tube fins, you have to add 3/4 oz of ballast to the shoulder of the NC to get a margin of 1.15, loaded with 3 A10s. Performance on this version gets about 265' altitude, with a really good Dv of only 3.22 FPS. This surprises me, with all that ballast added. Even the 1/2A3-2T did OK, with an altitude of 104' and a Dv of only 8.07 FPS.
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How does your revised design perform if one of the A10-3T's doesn't light? That's a reasonable scenario, and even more so for relatively inexperienced flyers.
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Using your original version, a one-engine-out launch still gets 147' with a Dv of 22 FPS, so it's still a relatively safe bird. A two-engine-out situation won't even get off the pad. My revised version should be similar.
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