- Joined
- Nov 21, 2011
- Messages
- 482
- Reaction score
- 218
I'm attempting to make threaded plastic retainers for 38mm motors similar to the estes ones. https://www.hobbylinc.com/htm/est/est9750.htm?source=froogle&gclid=CMCQ1pfMmrwCFUYOOgodPjYAxQ
Since the metal HPR cases are a lot hotter, I incorporated a thin pieces of motor mount into the cap to act as an insulator for the plastic. Initial blowtorch testing indicates the insulator works well.
The current prototype only works with the thin external thrust rings that loki and AMW use. I can make a cap that fits cesaroni cases as well (they all have plastic shoulders?)
I'd like to make the retainer work for aerotech cases too, but I am not sure how hot they get. Because of their shoulder geometry, I can't use the same style of insulator I use for the loki and AMW cases.
I'm looking for any suggestions for improvement as well as a few beta testers to see how this works on an actual rocket.
I'm estimating final costs for the loki/AMW style to be $15/set, with the threaded section that attaches to the tubes to be 2/$10 and additional caps to be $10. Of course, this all assumes it works as expected.
Since the metal HPR cases are a lot hotter, I incorporated a thin pieces of motor mount into the cap to act as an insulator for the plastic. Initial blowtorch testing indicates the insulator works well.
The current prototype only works with the thin external thrust rings that loki and AMW use. I can make a cap that fits cesaroni cases as well (they all have plastic shoulders?)
I'd like to make the retainer work for aerotech cases too, but I am not sure how hot they get. Because of their shoulder geometry, I can't use the same style of insulator I use for the loki and AMW cases.
I'm looking for any suggestions for improvement as well as a few beta testers to see how this works on an actual rocket.
I'm estimating final costs for the loki/AMW style to be $15/set, with the threaded section that attaches to the tubes to be 2/$10 and additional caps to be $10. Of course, this all assumes it works as expected.