Regen makes a small rocket engine with reference LR-32 (not to be confused with the XLR-32 from Reaction Motors.

"Schematic section of the Regen"

-This miniature rocket engine delivers 32 lbf of thrust and is bi-propellant, running on alcohol and nitrous oxide.

Its real size can be supposed in the photo next to a pen.

"Photograph of the Regen, in the center"

-In the center is the LR-32 and in the upper part the combustion chamber that is welded to the main body.

-We see that it is of the regenerative type since the fuel enters next to the nozzle and rises around the chamber to the top to enter it.

-This motor is offered in the USA by Aerocon Systems.