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Old 06-08-2019, 07:47 AM
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Jerry Irvine Jerry Irvine is offline
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Quote:
Originally Posted by Jack Hydrazine
The ST-125 was the airframe tubing that had an O.D. of 1.34" and an I.D. of 1.25" with a wall thickness of 0.045"?

The BT-11 was the 29mm motor mount tube? The O.D. was large enough to slip into the 1.25" airframe I.D.?
Yes.

USR/Ace BT-11 is 1.14 x 1.22. Estes/Enerjet BT-11 (whatever they really call it) is 1.14 with a thinner wall around 1.20 OD. I have some around here somewhere.

Jerry
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