byoungblood
Well-Known Member
- Joined
- Jul 19, 2014
- Messages
- 247
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- 5
On my first two flights with a 29/40-120 case I picked up here a few months back I've had two consecutive early deployments with the motor. First was with a G53J, second with a G64W, both running 10 second delays, undrilled.
First flight with the G53, the 'chute deployed almost immediately after motor burnout. Fortunately no damage to anything, (FG Darkstar Jr) but as I disassembled the motor, there looked like scorch marks alongside the delay liner, but it didn't appear to propagate all the way up to the delay o-ring.
Second flight this past weekend, on the G64, the 'chute deployed while the motor was still burning, shredding the shock cord. Chute and nosecone came down on its own, the body plopped down (fortunately away from everyone) in the plowed field, remarkably with only a tiny zipper to show for it. Post flight, this time there showed no signs of flame around the delay liner. However, the body tube was filled with dark black soot, like the ejection charge didn't burn fully. Delay o-ring was intact.
Thinking a problem with the delay well, I measured it with a set of calipers and found no obvious anomalies. However, all of the delays that I've put into this case have felt a little loose and have required a wrap of tape to get them snug. I've got another load for the case, but am a little reluctant to fire this motor again.
Any suggestions, thoughts?
First flight with the G53, the 'chute deployed almost immediately after motor burnout. Fortunately no damage to anything, (FG Darkstar Jr) but as I disassembled the motor, there looked like scorch marks alongside the delay liner, but it didn't appear to propagate all the way up to the delay o-ring.
Second flight this past weekend, on the G64, the 'chute deployed while the motor was still burning, shredding the shock cord. Chute and nosecone came down on its own, the body plopped down (fortunately away from everyone) in the plowed field, remarkably with only a tiny zipper to show for it. Post flight, this time there showed no signs of flame around the delay liner. However, the body tube was filled with dark black soot, like the ejection charge didn't burn fully. Delay o-ring was intact.
Thinking a problem with the delay well, I measured it with a set of calipers and found no obvious anomalies. However, all of the delays that I've put into this case have felt a little loose and have required a wrap of tape to get them snug. I've got another load for the case, but am a little reluctant to fire this motor again.
Any suggestions, thoughts?