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Kontax KS90 low temperature Stirling engine


Kontax are one of the better quality makes of low temperature Stirling engines.

This is a fairly conventional low temperature Stirling engine, except that it's made to a high quality standard. It's claimed to be able to run off the heat from a hand, although I've found this is only so if the air temperature is low enough. It will run on my naked thigh at room temperature! It will also run on a block of ice and, of course, a mug of tea.

It has miniature ball bearings in the crank shaft and a graphite power piston in a glass cylinder. The power cylinder is 9.5mm bore x 8mm stroke. The displacement piston is 70mm diameter x 7mm stroke.

Condition is used but almost as good as new. This example comes with the optional glass dome cover.

Make Kontax
Model KS90
Made 2010s?
Description Low temperature Stirling engine
Cylinders 1
Cylinder Type Single acting, graphite in glass
Bore mm 9.5
Stroke mm 8
Mechanical Condition Good
Cosmetic Condition Good
Paintwork N/A
Purchased 3/4/2018
Purchase cost 40
Additional cost