12-09-2007, 11:31 PM
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Forest Sprite
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Join Date: Dec 2006
Location: Back Up in the Woods
Posts: 3,657
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Quote:
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Originally Posted by kurtschachner
Ya, I am assuming it is spiral wound BT-40. IIRC Estes never made parallel-wound BT-40, it was only the leftover MMI stock, right?
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No, when I mentioned the part about them only having a spiral-wound version, I was referring to Semroc's BT-30.
I started ordering from Estes in 1967, but I don't recall ever seeing the engine mailing tubes (aka BT-40) during that time. My orders used to come in a long box - almost exactly like my orders from Semroc do!  - and the engines would come lined up end to end and rolled up in some newspaper, and then packaged in their own little parcel post box, as I recall.
I'm not 100% sure about this, though; it was a long time ago, I only had about 3 or 4 orders with them altogether (didn't have much money then) before taking a 30+ year hiatus from the hobby, and nothing that I had from that era has survived (my folks threw away all of my rocket stuff - including live engines!  - when I went off to college). 
Mark K.
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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