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#61
09-18-2019, 12:07 PM
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Quote:
Makes me wonder what the propellant formula was. Nice freshly cured generic formula APCP even takes a little nudge to get going. It gets harder (to ignite and physically harder) as it ages, though a little roughing up of the core or slot will help it considerably.
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#62
09-18-2019, 01:00 PM
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It's easier to ignite than even blue thunder.
Gary at Aerotech would know. He was a major player at CD back then. I burned an E20-7 CD Pro Jet from '81 about 3 years ago. Flew fine, delay worked.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
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#64
09-18-2019, 04:01 PM
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No idea about the Crown motor.
I still have some Pro Jets from the early 80's, never had one fail. Have heard that some old composite motors have delay problems/failures to eject, but I have not had that issue.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
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#65
09-18-2019, 06:05 PM
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I've seen a few grains shrink and crack or pull away from the cardboard tubes over the years. If that has happened, you will over pressure. If it has stayed together, you have a decent chance of success, assuming it is just a generic APCP formula. I have no idea how other propellants age. Jerry has seen a lot more grains than I have, and may have an idea what CD Pro-Jet and Crown used since he used to rub elbows with Gary.
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I love sanding.
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