10-04-2017, 11:13 AM
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Master Modeler
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
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Quote:
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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?)
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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. |