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  #11  
Old 04-07-2017, 01:44 PM
astronwolf astronwolf is offline
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That's OK. It's not possible to talk too much about the BNC-20CB. ;-) Or topics like the evolution of the BNC-20L or what the other side of the Estes Bandit looked like. Carry on....
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  #12  
Old 04-15-2017, 03:08 PM
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mojo1986 mojo1986 is offline
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Hey guys, I need a bit more info on this kit. Can anyone tell me either:

The total length of the BT-50 body tube (part E in the exploded view), or, if your kit is already built,

The EXPOSED length of the same tube after its insertion into the BT-55 booster tube (so, from the 5055 adapter ring forward to the front edge of the BT-50 tube).


http://www.spacemodeling.org/jimz/estes/est1279.pdf



Thanks in advance!


Joe

Last edited by mojo1986 : 04-15-2017 at 05:08 PM.
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  #13  
Old 04-15-2017, 09:45 PM
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mwtoelle mwtoelle is offline
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The length of the BT-50 in the Nike-Ajax kit is 18". An unsuffixed BT designation in Estes instructions means the full uncut length available from Estes. That means 18" with the exception of the BT-30 (9"), the BT-70 (17.5"), the BT-80 (7.6"), and the BT-101 (16.5"). Further, the uncut length of the BT-40 was 13.75".
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  #14  
Old 04-16-2017, 07:49 AM
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mojo1986 mojo1986 is offline
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Hi, Mike. Thanks for your input. Yes, I thought the same thing, but there's a problem: 3.9 inches of the BT-50 is buried inside the BT-55 booster section. That leaves 14.1 inches of exposed BT-50. Trouble is, when I measured the section of exposed BT-50 that I removed, it was 12.5 inches. So did the original builder get it wrong, or was the BT-50 less than 18 inches. Furthermore, when I put the 12.5" replacement tube in place, it just looks too darn long.

So while your analysis makes sense to me, I still need an explanation for the inconsistency. That's why I'm hoping that someone here can actually measure the length of the tube in a kit, or measure the exposed length of the BT-50 in a built one.


Joe
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  #15  
Old 04-16-2017, 11:02 AM
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SEL SEL is offline
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Quote:
Originally Posted by mojo1986
Hi, Mike. Thanks for your input. Yes, I thought the same thing, but there's a problem: 3.9 inches of the BT-50 is buried inside the BT-55 booster section. That leaves 14.1 inches of exposed BT-50. Trouble is, when I measured the section of exposed BT-50 that I removed, it was 12.5 inches. So did the original builder get it wrong, or was the BT-50 less than 18 inches. Furthermore, when I put the 12.5" replacement tube in place, it just looks too darn long.

So while your analysis makes sense to me, I still need an explanation for the inconsistency. That's why I'm hoping that someone here can actually measure the length of the tube in a kit, or measure the exposed length of the BT-50 in a built one.


Joe


Hi Joe,

I have an open kit around here somewhere. I'll dig it out and measure the tube for you.

Sean
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  #16  
Old 04-16-2017, 12:43 PM
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mojo1986 mojo1986 is offline
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Sean, I really appreciate it!


Joe
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  #17  
Old 04-16-2017, 02:57 PM
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Quote:
Originally Posted by mojo1986
Sean, I really appreciate it!


Joe


No problem, Joe. The BT50 in my Ajax kit is 18'' long HOWEVER there is a post-it on the outside of the kit bag the reads 'Crimped BT50'. The BT50 in the bag is not crimped, so I may have replaced it back when I was getting ready ( or so I thought) to build it. I didn't make a note to cut the tube, so I still have to assume that the original was 18'', but have to mention it here in the spirit of full disclosure.

S.
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  #18  
Old 04-17-2017, 08:23 AM
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mojo1986 mojo1986 is offline
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Sean, many thanks! Well, that ALMOST clears things up. Now if only that darn tube was the original, we could be 100% certain.
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  #19  
Old 04-17-2017, 09:03 AM
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JumpJet JumpJet is offline
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According to my records the Nike Ajax uses the following tube sizes.

BT-55KA P/N 30387 10.625" Long
BT-50 P/N 30352 18.0" Long


John Boren
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  #20  
Old 04-17-2017, 09:23 AM
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mojo1986 mojo1986 is offline
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Thanks, John. That settles it, BT-50, 18" long. Thanks to all who responded. I appreciate the support.


Joe
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