Quote:
Originally Posted by RG m3
You work in composites so you know a lot more than I do, that's out of my depth, I only report what I read! I guess doing all those tests takes a lot of time and money, so maybe that wasn't done, who knows. Yes, so far the problems only seem to be with the original Eventuri design. I have their updated plenum which bolts the throttle adapters to the velocity stacks with special vibration resistant lock nuts to avoid this problem. I think they learned from their mistake and did a thorough update. Hoping it holds up over time.
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I bet they are using nylon lock nuts? Nylon lock nuts can’t be used in spacecraft/space due to nylon high rate of outgassing in a vacuum. Either Nord-lock SS wedge-lock washers or wire-lock nuts/bolts. Third option is something called Vibra-tite which is a gummy coating you put on a portion of the threads on a fastener (it is different from loctite). However, a properly designed bolted joint should not lose preload under reversing (dynamic/cyclic) loads.
FYI, the Partee CF plenum uses bolted-on velocity stacks. Their full CF design is nice but I couldn’t stand their version with the Lexan window which they no longer make.