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  #11  
Old 04-10-2018, 01:04 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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Last edited by hcmbanjo : 04-10-2018 at 02:29 PM.
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  #12  
Old 04-10-2018, 07:06 AM
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mojo1986 mojo1986 is offline
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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  
Old 04-10-2018, 10:59 AM
astronwolf astronwolf is offline
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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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  #14  
Old 04-10-2018, 02:27 PM
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hcmbanjo hcmbanjo is offline
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Quote:
Originally Posted by astronwolf
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.


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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  #15  
Old 04-10-2018, 02:47 PM
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ghrocketman ghrocketman is offline
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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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  #16  
Old 04-10-2018, 05:38 PM
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here's a couple of pics of my two old BT-30s
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  #17  
Old 04-10-2018, 05:47 PM
jdbectec jdbectec is offline
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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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  #18  
Old 04-10-2018, 06:32 PM
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Quote:
Originally Posted by A Fish Named Wallyum
Looking forward to seeing that.


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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  #19  
Old 04-10-2018, 11:27 PM
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A Fish Named Wallyum A Fish Named Wallyum is offline
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Quote:
Originally Posted by LeeR
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.

I see a motor hook in the Sky Hook. Is yours mini-powered?
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  #20  
Old 04-11-2018, 02:16 AM
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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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