Excellent!!!! Thank you very much. Ye Olde Rocket shoppe still has its mojo.

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.

What I think is unique about this piston design is how the piston tube slides up into the model rocket, such that there is friction at the rb50 outside to -rb52 inside interface, plus friction between the engine and the inside of the rb 50.

The ribbed rubber piece is also interesting. Instead of just using a glued in engine block at the end of the rb50 piston tube. I assume that was used like a sping, in that it dampens the stop force against the piston head stop.


How much friction is there between the aluminum piston rod and this rubber stopper?

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.

Minimal friction. The rubber ring inside is bigger than the aluminum tube, so it moves freely.