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Old 04-04-2011, 11:03 AM
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cas2047 cas2047 is offline
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Join Date: Jun 2006
Location: MA, NH
Posts: 1,532

Originally Posted by DaveR
Having never built a Sat V, I thought your measurement on how much the motor mount was to be recessed was a typo, but after reading further, I see that's not the case. 3 3/8" seems like a lot to me. At what point does the Krushnic effect come into play?

I would hopefully always launch this rocket with enough of a stand-off from the blast plate to not allow a vacuum build-up, which I think is what causes the Krushnic effect with recessed motor mounts, although I've never seen it happen and am not all that familiar with it.

What I am really concerned about is just the burning of the inner lining of the main BT from the RMS motor exhaust. If I recess the mount just a little less I think I can reduce the possibility of that inner burning. Actually I see it a lot on one of my TLP kits, where the mount is recessed and the engine exhaust has charred the inside of the BT.
I plan ahead that way I don't have to do anything right now.

Oh by the way, I'm not here just for the "olde" rocket discussions.
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