Sunday, May 10, 2020

Semroc Aerobee-Hi KV-2 Build, Part 3, Engine Mount


I mentioned before, the BT-40 body tube wall is thick!
There is also the ST-7 engine mount tube that slides into the BT-40. The BT-40 tube by itself would make a loose fitting engine without the ST-7 slid in.





To the left of the ST-7 motor mount tube is the thick Centuri style engine block.
TRIVIA: Centuri called their engine blocks "thrust rings". It is thicker than a regular Estes EB-20 engine block.


The instructions don't mention cutting a notch in the thrust ring. I'd recommend it - the Kevlar is thick and could bulge the outer ST-7 tube.

The thrust ring is recessed 1/8" in from the top of the ST-7 motor mount tube.

1 comment:

  1. "Centuri called their engine blocks "thrust rings".

    Makes sense. In big rockets the engines and tanks are bolted to a thrust structure.

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