04-04-2020, 08:13 AM
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BAR
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Join Date: Nov 2005
Location: WI
Posts: 1,852
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Quote:
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Originally Posted by mwtoelle
I have instruction sets for the K-26 (1226) Arcas, K-38 (1238) Avenger, and K-47 (1247) Cherokee-D that were purchased between 1977 - 1980, and all of three of them came with an 18" long piece of BT-55. All three of them also came with plastic nose cones, a PNC-50Y for the Avenger and a PNC-55AC for the other two kits.
If I had to guess, switching to the longer BT-55 was either to compensate for the lighter nose cones or a simple reduction in reducing the number of parts on hand.
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I built the Thrustline clone many years ago, it was the shorter version with Balsa NC, and IIRC, needed a washer for stability. My assumption was that the switch to the longer tube was for better stability. I added a bit of NW on my (short) Semroc version too, though the kit didn't come with any. My original build as a kid was the pink hang-tag long version, and I have another in the bag. I've lost a few of these 
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Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org
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