Motor Adapter for Minimum Diameter Rocket

The Rocketry Forum

Help Support The Rocketry Forum:

Brian-Tampa

Active Member
Joined
Nov 10, 2019
Messages
35
Reaction score
9
Location
Tampa, Florida
Looking to build my first minimum diameter rocket.
Currently thinking of the Mad Cow 2.2 Go Devil.
It of course takes a 54mm motor. I was planning on epoxying a 54mm minimum retainer and then utilizing Aero Pack extenders for different 54mm case lengths.
I would also like to use 38mm motors in this rocket as well.
My question is this:
How do adapt a 54mm minimum diameter to accept 38mm motors?
Thanks in advance for any input.
Best Regards,
Brian
 

Joe Rocket 97

Well-Known Member
Joined
Jun 30, 2018
Messages
154
Reaction score
24
A couple centering rings, a motor tube and an Aeropack retainer in addition to you minimum diameter retainer
 

mbeels

Yes balsa
TRF Supporter
Joined
Feb 9, 2019
Messages
2,083
Reaction score
962
You can still use your MD retainer with an adapter. For example, the LOC MMA has a thrust ring built into it, so as long as you can thread your 38mm motor in to the MD retainer, the adapter is captive and everything is solid.
 

OverTheTop

Well-Known Member
Joined
Jul 10, 2007
Messages
3,806
Reaction score
1,133
Location
Melbourne Australia
If you are trying to keep mass down just use the Aeropack retainers and centering rings as already suggested. You can make the rings press-fit on the motor.
 

grouch

Well-Known Member
Joined
Apr 9, 2011
Messages
3,746
Reaction score
667
Location
Phoenix AZ
A nice sweet piece of tape around the back of the body tube and the motor. Yup.
 

Rocketjunkie

Addicted to APCP
Joined
Jan 19, 2009
Messages
4,069
Reaction score
280
Buy a LOC 38-54 adapter. I would not use the short piece of 54mm tube but use masking tape instead. 3/4" wide tape will hold at least 1000N thrust. Build up the tape layer to the OD of your rocket then a wrap of masking tape over the joint will keep the motor in place. Otherwise, friction fit. DO NOT put the BP in the ejection well. The friction fit only has to withstand the empty casing falling out during deployment events. Before installing the adapter into the rocket, cut off the excess 38mm tube in front of the 54mm coupler. Slide the motor in place and add a couple wraps of masking tape around the motor against the front of the adapter.
 

Latest posts

Top