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  #1  
Old 02-11-2013, 06:59 PM
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bubamech bubamech is offline
It's all nuts & bolts
 
Join Date: Oct 2012
Location: Texoma
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I got my bt5 to bt20 centering rings in the mail from semroc. Wow I just ordered them the other day. Now I can finish building my bt20 Bull Pup Oh yeah I am a happy boy. I thought I had an estes A10-3T in my box, I guess I must have used it, cuz it aint there. Anyhow, can somebody tell me the length of one of these engines so I can make my engine mount and paper transition. Thanks Y'all
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  #2  
Old 02-11-2013, 07:07 PM
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Doug Sams Doug Sams is offline
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Quote:
Originally Posted by bubamech
I got my bt5 to bt20 centering rings in the mail from semroc. Wow I just ordered them the other day. Now I can finish building my bt20 Bull Pup Oh yeah I am a happy boy. I thought I had an estes A10-3T in my box, I guess I must have used it, cuz it aint there. Anyhow, can somebody tell me the length of one of these engines so I can make my engine mount and paper transition. Thanks Y'all
The A10-3T and all the other T motors are 1.75" long. HTH.

Doug

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  #3  
Old 02-11-2013, 07:10 PM
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bubamech bubamech is offline
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Thank you sir, and the build goes on!
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  #4  
Old 02-11-2013, 09:53 PM
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gpoehlein gpoehlein is offline
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Location: Evansville, Indiana
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Here's a tip for future builds. After you fire a motor of each size (13mm, 18mm and 24mm), save the motor casing. When you get home, cut a few strips of paper 1/4" wide and as long as the sheet (11" or 14" from letter or legal paper). Put a thin layer of glue on one side of the strip of paper and wrap it around the rear of the motor, building it up to several thicknesses. Let dry.

Once these are dry, you have the perfect motor thrust ring insertion tool. Put a bit of glue on a stick and put a ring of glue inside the body tube where the thrust ring will end up. Put the thrust ring in the back of the rocket and push it into place with your insertion tool. This will insure that the motor always extends out the back of the rocket by 1/4". You can add a motor clip if you want to using the same spaceing - the slit for the motor clip will be just behind the thrust ring.

Greg
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Old 02-11-2013, 11:04 PM
Peter Olivola Peter Olivola is offline
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Or, if you're lucky and can score a roll or two are you local art supply store, use 1/4 inch masking tape. Much easier.

Quote:
Originally Posted by gpoehlein
Here's a tip for future builds. After you fire a motor of each size (13mm, 18mm and 24mm), save the motor casing. When you get home, cut a few strips of paper 1/4" wide and as long as the sheet (11" or 14" from letter or legal paper). Put a thin layer of glue on one side of the strip of paper and wrap it around the rear of the motor, building it up to several thicknesses. Let dry.

Once these are dry, you have the perfect motor thrust ring insertion tool. Put a bit of glue on a stick and put a ring of glue inside the body tube where the thrust ring will end up. Put the thrust ring in the back of the rocket and push it into place with your insertion tool. This will insure that the motor always extends out the back of the rocket by 1/4". You can add a motor clip if you want to using the same spaceing - the slit for the motor clip will be just behind the thrust ring.

Greg
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  #6  
Old 02-11-2013, 11:28 PM
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bubamech bubamech is offline
It's all nuts & bolts
 
Join Date: Oct 2012
Location: Texoma
Posts: 84
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Quote:
Originally Posted by gpoehlein
Here's a tip for future builds. After you fire a motor of each size (13mm, 18mm and 24mm), save the motor casing. When you get home, cut a few strips of paper 1/4" wide and as long as the sheet (11" or 14" from letter or legal paper). Put a thin layer of glue on one side of the strip of paper and wrap it around the rear of the motor, building it up to several thicknesses. Let dry.

Once these are dry, you have the perfect motor thrust ring insertion tool. Put a bit of glue on a stick and put a ring of glue inside the body tube where the thrust ring will end up. Put the thrust ring in the back of the rocket and push it into place with your insertion tool. This will insure that the motor always extends out the back of the rocket by 1/4". You can add a motor clip if you want to using the same spaceing - the slit for the motor clip will be just behind the thrust ring.

Greg

I like it. Thanks for the tip guys.
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  #7  
Old 02-12-2013, 08:58 AM
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gpoehlein gpoehlein is offline
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NP - in fact, I also made a set out of the yellow motor block insertion tubes that Estes packs in many of their kits. These work the same, but they nest inside each other for storage (except for the two 24mm tools - I have one 2-3/4" and one that is 3-3/4" for C/D motors an the other for E motors. These are also handy for installing a thrust ring with Kevlar thread tied around it for a shock cord mount - I can thread the Kevlar thread out through the back of the tool while inserting the thrust ring and keep it out of the glue.

Greg
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