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Genesis of LMR & HPR.

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Destructive Testing of Motor Casings.




Once you build to requirement, not rumor or hype or
myth, you build a whole bunch lighter.

U.S. Rockets reloadable motor systems are made with
6061 T-6 aluminum designed to peel not frag. Furthermore
the nozzle design allows for softer failure modes as well.

Motor Failure Mode Engineering

U.S. Rockets Reloadable & Recyclable motors are engineered to
have "soft" failure modes. One aspect of this deign is a feature
that expends or expels a portion of the nozzle in the event of an
overpressure anomoly. This failure mode is quite rare, but when it
does happen it is potentially hazardous if the casing can fragment.

Our system has been tested with specially designed research loads
to determine if it performs as engineered.

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A 29mm R&R system with a brand "A" case installed. It was operated
to an over pressure condition and the nozzle divergent end was expelled
along with the throat. The resulting shape effectively acted like a
much larger throat allowing the load to burn to completion without
expelling other parts. The nozzle piece hit the blast deflector plate
on the launch pad test fixture and landed within 10 feet of the pad.

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Shows an unbroken nozzle, an expended piece, and the test unit after firing.

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The nozzle was removed for inspection

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Top view.

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Bottom view.

The casing

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The casing does not fragment.

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Butterfly shape artifact.


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