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#1
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Sky Hook with BT-30?
It appears this old Sky Hook kit has a parallel wound BT-30 tube in it.
https://www.ebay.com/itm/Vintage-Es...IP/302698663555 Was that a thing? [EDIT] Looks like the same thing in this Mark kit: https://www.ebay.com/itm/Vintage-Es...IP/302698665366
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Scott D. Hansen Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe! Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies! Ye Olde Rocket Forum WOOSH NAR Section #558 |
#2
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Yes I believe they were both BT-30-based kits. I happen to have a 1969 catalog laying here by the computer and the entries for both give an OD of 0.769 which is BT-30.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#3
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Hmmm, that reminds me, it's about time I treed another Sky Hook. Guess I'd better stick one in with my next eRockets order.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2 |
#4
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Yes, BT-30 along with the Astron Scout, Sprite, and Space Plane. Maybe more, but that's all I recall.
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#5
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I believe that the Sky Hook started out as a BT30 kit, but later changed to BT20.
The other mentioned kits (Scout, Mark II, Sprite, and Space Plane) stayed BT30 throughout their entire run. The Scout II was BT20 based.
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#6
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I think the original Hornet as well.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2 |
#7
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Quote:
Yes, all BT-30's were parallel wound until the 70's. The initial ones were apparently made on the Estes' kitchen floor (or maybe table) with manilla folders. I think they quickly got a tube company to make them with the manilla material, but they still looked hand wound! I have a couple right here. Maybe 1973 was the first spiral-wound BT30 I ever saw? I think the Mark II was the first kit utilizing the spiral-wound tubes.
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Roy nar12605 |
#8
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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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#9
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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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#10
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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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