04-10-2018, 12:04 AM
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When Pigs Fly!
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Join Date: Sep 2005
Location: Orlando, FL
Posts: 1,102
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I always thought this BT-30 illustration was strange.
The BT-5s and above are spiral wound.
But the BT-30 tube drawing, that 'aint no parallel wound tube!
That drawing is from the 1973 Estes catalog -
Enlarge to see what's wrong!
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