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Old 09-21-2017, 12:10 PM
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rocketguy101 rocketguy101 is offline
frustrated aero
Join Date: Sep 2006
Location: Duncan, OK
Posts: 723

I thought the issue with thermal cycling was the differential diametrical change between the case and the propellant slug (due to different coefficient of thermal expansion of the materials) which allowed the propellant to de-bond from the paper case. During the burn, when it reached the OD of the slug there is a sudden large increase in surface area, causing a pressure spike which leads to CATO.

I don't see how this could self heal...but I've wondered if you could put an epoxy fillet at the back of the motor to keep the slug in, like the old EnerJet motors???
David Stribling
NAR 18402 SR
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