Kratmo 10A Repl.

This motor is a 2 stroke engine with .57 cu inch. It is equipped with an electric ignition system, and the original machine was constructed and built by Walter Kratzsch about 75 years ago, who created a whole “engine-family” of several gasoline and diesel types with different engine sizes:

The Kratmo 10 A belongs to a small international “pioneer-group” of the first really usable and reliable model engines, that were developed in the “stone-age” of model airplanes:
This engine, built between 1931-1936, gained an international level of awareness by many records achieved with free-flight motor-model-airplanes – perhaps you know the antique model “Goldhahn” as a classic example of successful models built within this decade with primitive means from our present sight of view.-
Logically there are only very few original engines left today; all in property of model-engine-collectors, who usually store those engines in a glass case…
The replica of this engine I have reproduced in facsimile to the original machine with a small constructive concession for easy use: I replaced the sensitive contact –ignition with a maintenance-free transistor-system - by maintaining the ignition advance:
This engine is no historic “sensible”, but a reliable solution for daily use:
So every ambitioned builder of antique model airplanes has now the possibility to motorize his model adequately in sound and optic with this special engine…


Size: 9,5 ccm or .57 cu inch
Bore: 22 mm
Stroke: 25 mm
Weight: 420 g
Output: 4200 rpm with a 16” x 8” Forte-Woodprop.

Kratmo 10A without ignition system -- 320. - €
Ignition system for Kratmo 10A -- 70. - €

Video Kratmo 10A

My Falcon with 2600mm span and the Kratmo 10A in action: Takeoffs from a grass track are no problem, sound and optic create a perfect nostalgic flair…