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  #1  
Old 04-20-2022, 02:58 PM
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Default Centering ring question.

Hi guys. I would like to put a 29mm engine mount tube into an Estes Pro Series 2" OD body tube but I don't know which centering rings to order from Semroc and/or Aerotech. The centering rings that came with the Estes Pro Series Ventris kit would be the correct size but I don't have the dimensions.

The OD of my 29mm EM tube is 1.200". I don't know the ID of the Pro Series 2" body tube because I don't have the body tubes yet.

Thanks!
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Old 04-20-2022, 04:08 PM
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My 2X Javelin is made from those tubes.
The I.D. on mine is 49mm.
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  #3  
Old 04-20-2022, 04:20 PM
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Old 04-20-2022, 05:50 PM
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Pretty sure 2" Pro Series tubing is just Centuri ST-20.
29mm Semroc/Centuri tubing is LT-115.
You need ST-20 to LT-115 centering rings.
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Old 04-20-2022, 06:25 PM
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ST-20 is 2” ID, PSII is 2” OD. I got 29mm to PSII 2” from Vanderburn which was bought by Launch Lab rocketry, so you could ask them. Also here from I think rocketryworks on ebay: https://www.ebay.com/itm/3246542514...7Cclp%3A2332490
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Old 04-20-2022, 07:17 PM
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Thanks guys! That info is just what I needed.
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  #7  
Old 04-21-2022, 03:09 AM
BARGeezer BARGeezer is offline
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https://www.erockets.biz/semroc-cen...-ra-52h-2-0ply/
"ID= 1.216 For BTH-52(LT-115) Body Tube(29mm Motor Tube)

OD= 1.937 for 2" Estes Pro Tube"
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Old 04-21-2022, 07:51 AM
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Quote:
Originally Posted by BARGeezer
https://www.erockets.biz/semroc-cen...-ra-52h-2-0ply/
"ID= 1.216 For BTH-52(LT-115) Body Tube(29mm Motor Tube)

OD= 1.937 for 2" Estes Pro Tube"


THAT’S the one! Thanks!
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