08-02-2017, 04:03 AM
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Master Modeler
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
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Quote:
Originally Posted by tbzep
All the Alphas, Alpha III's and Alpha IV's are BT-50. You're just getting the numbers mixed up a little. BT-20 is the size for 18mm motor mounts (1/2A - C)
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Maybe Woody saw an Astron Skyhook (see: http://www.ninfinger.org/rockets/no...a/69est012.html )? It looked pretty similar to the Alpha, and its BT-30 body tube was quite close in diameter to BT-20.
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