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  #1  
Old 04-08-2018, 05:59 PM
Ltvscout Ltvscout is offline
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Default 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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  #2  
Old 04-08-2018, 06:12 PM
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BEC BEC is offline
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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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  #3  
Old 04-08-2018, 06:16 PM
A Fish Named Wallyum A Fish Named Wallyum is offline
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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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Old 04-08-2018, 06:43 PM
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tbzep tbzep is offline
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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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Old 04-08-2018, 07:49 PM
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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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Old 04-08-2018, 07:59 PM
A Fish Named Wallyum A Fish Named Wallyum is offline
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I think the original Hornet as well.
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  #7  
Old 04-09-2018, 09:57 PM
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Royatl Royatl is offline
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Quote:
Originally Posted by Ltvscout
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



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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  #8  
Old 04-10-2018, 12:04 AM
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hcmbanjo hcmbanjo is offline
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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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Old 04-10-2018, 06:06 AM
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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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Old 04-10-2018, 09:59 AM
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Quote:
Originally Posted by hcmbanjo
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!

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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