VAXman
Member
- Joined
- Mar 13, 2016
- Messages
- 77
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- 14
I've purchased a 54mm CTI (1211J140) for my level 2 certification flight. I removed it from its packaging and installed it, temporarily, in the CTI 3-grain enclosure, and installed the assembled unit in my rocket to determine its CG with motor. This motor is plugged, BTW. I noticed that there is an O-ring on the delay/ejection module which mates up on the *inside* of the motor casing insulator. I'm assuming this is the same assembly also used on other 54mm CTI motors that have ejection and require adjustment. My question, however, is that there is no similar *inner* O-ring on the nozzle end module. I'm not referring to the O-rings that contact the inside of the motor casing; those exist at/on both end modules.
Is there enough pressure provided by the motor case and the retaining ring to keep gasses from leaking at the interface between the motor insulator and the nozzle? I realize the insulator will probably burn away to some extent, so this concern of mine may be moot, but I thought I'd ask here to be certain.
Is there enough pressure provided by the motor case and the retaining ring to keep gasses from leaking at the interface between the motor insulator and the nozzle? I realize the insulator will probably burn away to some extent, so this concern of mine may be moot, but I thought I'd ask here to be certain.