jkovac
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- Joined
- Jul 21, 2015
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My exact question is hard to put in the title. I've seen a lot of threads on the MD retainer in general but nothing about this: The instructions that come with the Aeropack 54mm minimum diameter retainer say you should put the motor together with everything except the propellant -including the spacer, liner and O-rings -before using it as a guide to place the MD retainer inside the body tube.
I'm concerned about possibly damaging the O-rings when doing this. Beyond that, I don't recall seeing a gap between the forward and aft closures on fully built Aerotech motors (we're talking an LMS K250 in this instance) and the motor tube - I believe both closures screw the whole way in. So it would be exactly the same length whether the O-rings were in there or not if that's true. But I'm not looking at an assembled motor now, so maybe I'm wrong.
So the question is - does one really need to put the motor together with the 0-rings, spacer and liner to place the retainer correctly, or will just the motor tube with forward and aft closures attached give me the same length? Any input appreciated.
I'm concerned about possibly damaging the O-rings when doing this. Beyond that, I don't recall seeing a gap between the forward and aft closures on fully built Aerotech motors (we're talking an LMS K250 in this instance) and the motor tube - I believe both closures screw the whole way in. So it would be exactly the same length whether the O-rings were in there or not if that's true. But I'm not looking at an assembled motor now, so maybe I'm wrong.
So the question is - does one really need to put the motor together with the 0-rings, spacer and liner to place the retainer correctly, or will just the motor tube with forward and aft closures attached give me the same length? Any input appreciated.