#61
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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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I love sanding. |
#62
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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 ! |
#63
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So you think these pro jet or crown motors will still be ok after 30 yrs?
I’m planning on that crown F67 Jz |
#64
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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 ! |
#65
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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. |
#66
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Thanks for the discussion, it’s been 30 yrs
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#67
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A few pics . . .
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#68
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More pics . . .
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#69
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Oldies but goodies . . .
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#70
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Classic "muscle" . . .
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