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  #41  
Old 10-03-2017, 07:33 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
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Sorry on BT-52.
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  #42  
Old 10-04-2017, 11:13 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by Royatl
BT-56 is just Estes' name for ST-13

BT-52 is a slip fit of BT-50 and it was used for the Thor Agena.

96 (thor diam.) / 60 (agena diam.) = 1.637 (bt-60 diam.) / 1.024 (bt-52 diam. + 0.01 -- I wonder if that wasn't an off-by-one error originally when specifying to the tube manufacturer?)
I'm not sure. I have never had a Thor-Agena B kit, nor was I aware--until I looked up its instructions *here* http://www.spacemodeling.org/jimz/estes/k-28.pdf just now, after reading the above postings--that it used/uses BT-52 tubing for the Agena B second stage (it could be cut shorter to make a Thor-Agena A [Thor-Hustler, so called because the JP-4/nitric acid-burning second stage engine was originally designed to power the cancelled "powered bomb pod" for the B-58 Hustler])...but:

I had previously seen BT-52 tubing listed, many years ago, and it wasn't in a regular Estes catalog. I may have seen it listed in Estes' "Custom Parts Catalog" (which dates to 1974), but I think I saw it listed in the instructions of an Estes kit that I once built--but I can't remember which one it might have been. ALSO--speaking of the Estes Thor-Agena B kit, *here* http://www.google.com/search?q=Este...iw=1440&bih=794 is a set of nice color photographs of Hans "Chris" Michielssen’s beautifully-built-and-detailed Thor-Agena B model.
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  #43  
Old 10-04-2017, 04:10 PM
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mwtoelle mwtoelle is offline
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About the only places that I have seen the BT-52 used as an external tube are the Thor-Agena B (K-28), the Semi-Scale Saturn V (K-39/1239), and the Colonial Viper (1310) kits. BT-52 was more often used as a sleeve over the BT-50 motor tubes in several 'D'-powered kits. John Brohm's Estes tube reference goes into a bit more detail about which kits used the BT-52 as a sleeve. An interesting note is that the BT-52 used on the K-39 is actually a bit too small for the correct scale (1.014" as opposed to 1.081"). I suspect that Estes just used the closest available tube for that kit to save money.
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  #44  
Old 10-04-2017, 04:45 PM
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Quote:
Originally Posted by mwtoelle
About the only places that I have seen the BT-52 used as an external tube are the Thor-Agena B (K-28), the Semi-Scale Saturn V (K-39/1239), and the Colonial Viper (1310) kits. BT-52 was more often used as a sleeve over the BT-50 motor tubes in several 'D'-powered kits. John Brohm's Estes tube reference goes into a bit more detail about which kits used the BT-52 as a sleeve. An interesting note is that the BT-52 used on the K-39 is actually a bit too small for the correct scale (1.014" as opposed to 1.081"). I suspect that Estes just used the closest available tube for that kit to save money.
The Semi-Scale (1:242 scale) Saturn V was a "budget" version of the 1:100 scale one, so if they did use BT-52 for that reason, it was "in that spirit." :-)
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  #45  
Old 01-03-2018, 03:26 PM
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I just noticed today the Super Big Bertha and Astron Explorer are listed in stock. Order away!

https://www.estesrockets.com/new/00...er-big-berthatm

https://www.estesrockets.com/new/00...tron-explorertm
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  #46  
Old 01-03-2018, 05:52 PM
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BT-52 was used in the SPEV also.
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  #47  
Old 01-03-2018, 08:01 PM
stefanj stefanj is offline
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If I got the Explorer, I'd kitbash it, to make it more of a Sci-Fi spaceship.

Make the connecting tubes longer.

Make the upper tube shorter.

Cut the nose cone apart and add transparent tubing . . . that is what that cone was designed for originally, as I recall!

Turn the fins around. Maybe add pods on the tips.
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  #48  
Old 01-03-2018, 09:00 PM
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Quote:
Originally Posted by stefanj
If I got the Explorer, I'd kitbash it, to make it more of a Sci-Fi spaceship.

Make the connecting tubes longer.

Make the upper tube shorter.

Cut the nose cone apart and add transparent tubing . . . that is what that cone was designed for originally, as I recall!

Turn the fins around. Maybe add pods on the tips.


I might kitbash mine with ducted ejection—Trident style.
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  #49  
Old 01-03-2018, 09:00 PM
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A Fish Named Wallyum A Fish Named Wallyum is offline
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Quote:
Originally Posted by stefanj
Cut the nose cone apart and add transparent tubing . . . that is what that cone was designed for originally, as I recall!


Explain.
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  #50  
Old 01-04-2018, 06:01 AM
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Quote:
Originally Posted by A Fish Named Wallyum
Explain.
The earliest kit I know of that used that nose cone--or one very similar to it--was Estes' Odyssey (see: http://www.ninfinger.org/rockets/no...a/77est024.html ), which first appeared in their 1977 catalog. The Odyssey was--judging by the "real" vehicle's description in the catalog listing--part of Estes' "Star Trek canon" that began with their licensed Starship Enterprise and Klingon Battle Cruiser kits in 1975 (see: http://www.ninfinger.org/rockets/ca...75/75est22.html ), and was continued in 1976 with their Alien Invader (see: http://www.ninfinger.org/rockets/no...a/76est028.html ), Photon Disruptor, and U.S.S. Atlantis kits (see: http://www.ninfinger.org/rockets/no...a/76est024.html ). (Their Andromeda [see: http://www.ninfinger.org/rockets/ca...5/75est24h.html ], another starship kit that also first appeared in the 1975 Estes catalog, may have been inspired by this, although to me, it "felt" more like it was from the SF universe in which "The Starlost" occurred.)
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