08-28-2011, 12:36 PM
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Junior ??? Rocketeer
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Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
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Quote:
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Originally Posted by CPMcGraw
Sounds like the delay grain burns a bit hotter than the propellant grain. If replacing the delay with BP doesn't cause a burn-through, then it must be a temperature issue. Are there any delay grains that burn at a lower temperature?
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It is hard to see since there is so much ash, but when the 1/8" flap moves away slightly from the tube, it appears that it causes a swirl or vortex at the joint where the glue starts.
The slow delay generates much less heat and gas, so it seems to be a time issue.
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Carl McLawhorn
NAR#4717 L2
semroc.com
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