Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Work Bench > Scale & Sport Scale Rocketry
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 08-22-2018, 04:15 PM
DavidQ DavidQ is offline
Craftsman
 
Join Date: Aug 2011
Location: Washougal Washington
Posts: 219
Default

If the tube you are looking for is 2.618 OD, yet the BT-80 is only 2.6" OD, you could consider adhering one or more layers of printer paper, or glossy paper, to the outside to increase the diameter by .018".

I've done that on special occasions. Spray adhesive on the tube and the paper works great.

To get the .018", you could use one wrap of paper that is 9 mil thick, which is in the range of photo printer paper, or a couple thicknesses of photocopy paper, which are around 4.5 mil thick.
Reply With Quote
  #12  
Old 08-22-2018, 06:01 PM
A Fish Named Wallyum's Avatar
A Fish Named Wallyum A Fish Named Wallyum is offline
BP Mafia
 
Join Date: Mar 2005
Location: Ft. Thomas, KY
Posts: 6,914
Default

Quote:
Originally Posted by lgr
Thanks for all the replies so far. And it makes me happy to know that my first question here is one that isn't straightforward to answer

I think you'll find that we can make even the most straightforward question an adventure.
__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I was SAM 0058

On the build floor: Centuri Stellar Hercules, Semroc SLS Scorpion, Semroc Squire, RDC V-Max

Ready to fly: Canaroc Green Hornet, Estes Astron Farside X, FSI Eos, FRW Magnum Spartan, Centuri Stellar StarLifter, Estes World Federation Star Probe, Estes Astron Apogee
Reply With Quote
  #13  
Old 08-22-2018, 06:01 PM
Earl's Avatar
Earl Earl is offline
Apollo Nut
 
Join Date: Dec 2006
Posts: 1,565
Default

The S-IVB (third stage) tube in the 1/100 scale Saturn V kits (the original Centuri kit and the later various Estes re-issues) would use the same size tube as the one in question here.

If memory serves, the tube included in the Saturn V kit is a bit longer, so it would have to cut shorter.

So...if you (or some other kind soul) has a 'partial' Saturn V kit that includes this tube, you could use that for this 1b build.


Earl


P.S. - Possibly Estes cusromer service might be able to supply you a 'replacement' Saturn V tube for use, since I think they are supposed to be re-issuing that kit soon.
__________________
Earl L. Cagle, Jr.
NAR# 29523
TRA# 962
SAM# 73
Owner/Producer
Point 39 Productions

Rocket-Brained Since 1970
Reply With Quote
  #14  
Old 08-22-2018, 06:20 PM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 8,843
Default

+1 to what Bill just said above.
We could complicate boiling a pot of water.
__________________
When in doubt, WHACK the GAS and NEVER touch the brake !!!
No Harm=NO Foul advocate

If you are NOT FLYING LOW in the left lane, you need to GET THE #$&@ OUT of it !

Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
Reply With Quote
  #15  
Old 08-22-2018, 08:01 PM
BARGeezer BARGeezer is offline
Avid Builder
 
Join Date: Nov 2017
Posts: 211
Default

Quote:
Originally Posted by Earl
The S-IVB (third stage) tube in the 1/100 scale Saturn V kits (the original Centuri kit and the later various Estes re-issues) would use the same size tube as the one in question here.

If memory serves, the tube included in the Saturn V kit is a bit longer, so it would have to cut shorter.

So...if you (or some other kind soul) has a 'partial' Saturn V kit that includes this tube, you could use that for this 1b build.


Earl


P.S. - Possibly Estes cusromer service might be able to supply you a 'replacement' Saturn V tube for use, since I think they are supposed to be re-issuing that kit soon.



The original 1/100 Estes Sat 5 (#K-36) and the latest reissue (#2157) both use the BT-80 tube for that stage. Presumably the iterations in between do the same. I think this is done for expedience, since it's far more economical to use a readily available standard size tube than a specialty sized one. The difference is miniscule. The kit in question uses the BT-82 tube, per JumpJet. So, short answer, all you have to do is sand the two centering rings for the slightly smaller diameter and the BT-80- should work as a substitute.

As far as requesting a specific part not listed in their webpages or catalogs, I tried a couple of years ago to order the 3.42" tube used in the 1/45 Estes LJII, since I wanted to clone the old Mercury Atlas. The response was that since they no longer have a dedicated parts department, that would not be possible. So I made my own tube.
Reply With Quote
  #16  
Old 08-22-2018, 08:58 PM
Earl's Avatar
Earl Earl is offline
Apollo Nut
 
Join Date: Dec 2006
Posts: 1,565
Default

Quote:
Originally Posted by BARGeezer
The original 1/100 Estes Sat 5 (#K-36) and the latest reissue (#2157) both use the BT-80 tube for that stage. Presumably the iterations in between do the same. I think this is done for expedience, since it's far more economical to use a readily available standard size tube than a specialty sized one. The difference is miniscule. The kit in question uses the BT-82 tube, per JumpJet. So, short answer, all you have to do is sand the two centering rings for the slightly smaller diameter and the BT-80- should work as a substitute.

As far as requesting a specific part not listed in their webpages or catalogs, I tried a couple of years ago to order the 3.42" tube used in the 1/45 Estes LJII, since I wanted to clone the old Mercury Atlas. The response was that since they no longer have a dedicated parts department, that would not be possible. So I made my own tube.



Well, darn.

Yeah, I've built both the Centuri Saturn V and the 1b and have unbuilt kits of each. I also have the Estes k-36 and several of the later iterations (built the 30th anniversary version back in '99).

I just compared tubes from the various kits and they are different than the Centuri tube.

Now here's the interesting comparison. I just pulled out one of the very early 90's Estes re-issue of the Centuri Saturn 1b and it DOES use the same tube as the original Centuri kit...NOT the BT-80. Go figure.

I've done more intimate comparisons on the original Centuri 1b and the Estes re-issue of same, because I want to build one of the Estes re-issue 1b's I have as a operating two-stager. Knowing that those two kits shared the same tube, I had assumed Estes used that same tube in their Saturn V K-36 and later iterations. Not so.

Earl
__________________
Earl L. Cagle, Jr.
NAR# 29523
TRA# 962
SAM# 73
Owner/Producer
Point 39 Productions

Rocket-Brained Since 1970
Reply With Quote
  #17  
Old 08-22-2018, 11:21 PM
lgr lgr is offline
Junior Rocketeer
 
Join Date: Aug 2018
Posts: 10
Default

Thanks for getting to the bottom of this, folks. Here are pics of my crushed tube. It's only on one side, but it's pretty creased. I'm sure I could work with it if needed.
Attached Thumbnails
Click image for larger version

Name:  Photo Aug 22, 10 10 30 PM.jpg
Views: 56
Size:  156.0 KB  Click image for larger version

Name:  Photo Aug 22, 10 10 49 PM.jpg
Views: 39
Size:  177.6 KB  
Reply With Quote
  #18  
Old 08-22-2018, 11:27 PM
BARGeezer BARGeezer is offline
Avid Builder
 
Join Date: Nov 2017
Posts: 211
Default

Quote:
Originally Posted by lgr
Thanks for getting to the bottom of this, folks. Here are pics of my crushed tube. It's only on one side, but it's pretty creased. I'm sure I could work with it if needed.


That would be a PITA to repair. Easier to sub a BT-80, I think you'll be happier with the end result.
Reply With Quote
  #19  
Old 08-23-2018, 08:24 AM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 8,843
Default

That tube is NOT usable. It is a piece of junk worthy only of a bonfire.
I'd definitely use a BT-80 over that thing, sacrificing a few thousandths of scale accuracy.
__________________
When in doubt, WHACK the GAS and NEVER touch the brake !!!
No Harm=NO Foul advocate

If you are NOT FLYING LOW in the left lane, you need to GET THE #$&@ OUT of it !

Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
Reply With Quote
  #20  
Old 08-23-2018, 09:15 AM
lgr lgr is offline
Junior Rocketeer
 
Join Date: Aug 2018
Posts: 10
Default

Ok, I'm not worried about the scale as much as everything fitting together properly. I'll order up a bt-80. Thanks!
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 05:35 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2018