#11
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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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Hans "Chris" Michielssen Old/New NAR # 19086 SR www.oddlrockets.com www.modelrocketbuilding.blogspot.com http://www.nar.org/educational-reso...ing-techniques/ Your results may vary "Nose cones roll, be careful with that." Every spaceman needs a ray gun. Look out - I'm the Meister Shyster! Last edited by hcmbanjo : 04-10-2018 at 01:29 PM. |
#12
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The BT-30 didn't stay parallel-wound forever. Sometime in the seventies it became a spiral-wound tube.
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#13
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Quote:
Are you referring to the representation of parallel-woundedness? The spiral wound tubes have spirals seams shown. You can't show the seams like that on a parallel wound tube, so the artist drew what looks like a circumferential line on the tube. Symbolism. It's like, oh yeah.... I "get it." Nothing wrong here.
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
#14
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To me, the catalog illustration looks like two tubes joined by an internal coupler. I remember the parallel wound BT-30 tubes. There was a visible lap seam running down the length of the tube. The lap line could have been drawn down the tube from top to bottom. No big deal, I just thought the drawing was interesting.
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Hans "Chris" Michielssen Old/New NAR # 19086 SR www.oddlrockets.com www.modelrocketbuilding.blogspot.com http://www.nar.org/educational-reso...ing-techniques/ Your results may vary "Nose cones roll, be careful with that." Every spaceman needs a ray gun. Look out - I'm the Meister Shyster! |
#15
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Agree with hcmbanjo on this one.
The catalog illustration was opposite of the way it should appear. The line is perpendicular instead of parallel in the illustration which I always thought made ZERO sense. The way it was illustrated was total nonsense/balderdash/guff/bunk.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#16
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here's a couple of pics of my two old BT-30s
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Roy nar12605 |
#17
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In the "for what it's worth" department , my Estes Hornet came with a parallel wound body tube and a spiral wound payload tube I believe I got it when it was a free kit only. Perhaps that was when the transition started.
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Jeffrey Deem NAR16741 CIA section 527 |
#18
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Quote:
And here you go. This is my Semroc Sky Hook II in the picture, which is slightly larger than the BT-30 original. The upscale fins are 1/8” basswood, and so long I made the fin tabs longer than the Panavia kit’s slots, so they will get extended. Since the Panavia uses two body tubes that total 31” if I remember correctly, they are plenty long for a Sky Hook. At this scale, they need to be just under 23”. The nose cone is a really close match.
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Lee Reep NAR 55948 Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor In the Paint Shop: Nothing! Too cold! Launch-Ready: Farside-X, Maxi Honest John, Super Scamp |
#19
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Quote:
I see a motor hook in the Sky Hook. Is yours mini-powered?
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
#20
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No, it uses an 18mm ST-7 motor tube, with centering rings holding it in an ST-9. The body is ST-10. The ST-9 is a slip fit into the ST-10 and fin tabs glue to it.
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Lee Reep NAR 55948 Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor In the Paint Shop: Nothing! Too cold! Launch-Ready: Farside-X, Maxi Honest John, Super Scamp |
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