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Genesis of LMR & HPR.

Interchangable Motor Mounts


Interchangable Motor Mounts allow you to prep several power systems in advance of a launch and get several flights off quickly while the weather or other conditions are prefect. It is convenient to have several propulsion options to choose from for each of several rocket airframes so whatever motors you have or want to use that day are an easy and quick motor mount change away. Living the U.S. Rockets lifestyle is fun and easy. Fly high and fast, or low and slow, but have fun and fly safely.

mount
Single 29mm 1.125" Interchange Mount to
insert into a 54mm 2.125" Host Mount

mount
Triple 24mm 0.93" Interchange Mount to
insert into a 54mm 2.125" Host Mount

mount
18mm 0.69" Interchange Mount to
insert into a 24mm 0.93" Host Mount.

mount
18mm 0.69" Interchange Mount to
insert into a 24mm 0.93" Host Mount.

If you go to the kits page and click on the
Retail Packaged Accessories link you
will see a pretty comprehensive list of
Interchange Mounts U.S. Rockets offers.

mount
mount
mount

Different users try modifications of the basic system, often with clusters.
Here is a user that has a Tall Tail 10 who used the stock motor retention
for 54mm, 29mm, and 24mm, but modified the 3x24mm mount to utilize a central
retainer bolt. The red painted tube is the thrust ring. Masking tape goes
over the location where the thrust ring contacts the motor tube to keep the
motor and mount from ejecting out the back of the rocket when the parachute
deployment charge is activated. It allows any length motor to be used as well!

mount mount
This central bolt is itself long enough to account for common motor lengths.

Helpful understanding of cluster and conversion options,
motor diameters, and tube sizes according to our system.


We call 29mm tubing BT-11
1x29mm
3x13mm
1x24mm
1x18mm

We call 38mm tubing BT-15
1x38mm
3x18mm
1x29mm
1x24mm
1x18mm

We call 54mm tubing BT-22
1x54mm
1x38mm
1x29mm
7x18mm
3x24mm
1x24mm

We call 66mm tubing BT-26
1x66mm
1x54mm
1x38mm
3x29mm
4x24mm
1x29mm

We call 75mm tubing BT-30
1x75mm
1x54mm
1x38mm
1x29mm
4x29mm
7x24mm
12x18mm

BT-11 tubing is 29mm
BT-9 tubing is 24mm
BT-7 tubing is 18mm
BT-5 tubing is 13mm

Motor diameters:
Consumer:
13mm=0.49", 18mm=0.69", 24mm=0.935"
29mm=1.125", 38mm=1.50", 54mm=2.125"
Industrial:
66mm=2.5", 75mm-2.98", 98mm-3.875"
152mm=6.0", 229mm=9.0", 305mm=12"

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