How to extend a motor tube

[rocketkyle]

My last peice of 54mm motor tube is 1/2" too short for the 440cc Hypertek tank. How would I extend it for that last 1/2"?

Thanks,
Kyle

 

[xenon]

How long is it?

 

[rocketkyle]

The motor mount that I have is 24". The Hypertech motor with the 440cc tank is 24.2".

 

[Reed Goodwin]

Do you have anything in the rocket that would get in the way of the tank it it were to hang out of the motor tube a little? This might not be possible since I am not familiar with the specifics of the Hypertek system.
Reed

 

[xenon]

It'll be fine, you really only need about 16", just enough to support the injector bell. Just as long as it doesn't matter to the rocket if it sticks out the top.

 

[hokkyokusei]

I agree with xenon. I have a rocket that does just that.

 

[llickteig1]

I'm a little lost here.

If the motor is 24.2" long and the motor tube is 24" long, how is that too short? Doesn't the motor hang out the back at least 1/2" or maybe 3/4"? (btw, I recognize xenon's and hokky's posts on length as valid).

Am I dumber than a box of rockets, --Lance.

 

[rocketkyle]

the Hypertek feul grain has a built-in thrust ring at the bottom. I would like to take advantage of the thrust ring. The motor will be kept in by an Aeropac motor retainer. If it sticks out the bottom, then I would have to leave the retainer off. I will most likely do what xenon and hokkyokusei said.

Thanks.

 

[rocketkyle]

I could probably just leave it as is, because since this rocket will be strickly dual deploy, I could epoxy a bulkhead 1/2" above the top of the MMT. My dad and I always epoxy a bulkhead above the MMT on dual deploy/ Hypertek rockets.

 

[getoutside3274]

I'd like to ask "how much motor sticking out of the top of the MMT is too much?". I have a Binder Design Excel Jr. that I have just setup with dual deployment and started looking into the longer 29mm motors. I have not added the anti-zipper coupler and bulkplate to the booster section and, at the least, wanted to insert a custom size centering ring that the longer RMS casing could slip into for support. This is my first time so please, be gentle!!

 

[rocketkyle]

As long as you have supports you should be fine. Dennis LaMonte had a cluster of 3 homemade N motors, and all they had were wooden supports all the way up.

Good luck,
Kyle Cornelius.