Sorry, Unknown, but completely untrue.

I can certainly tell you that AMT's (both the Netherlands and USA varieties) are NOT, and were NEVER based on the KJ-66 design. Actaully they came before any other 'production' turbines based on that design also.....

However, as far as I know many of the others are/were based either on the Schreckling/Artes KJ66 or the Thomas Kamps designs.

To the best of my knowledge there are/have been only 5 basic designs used by the 'major' turbine manufacturers over the past, say, 7 or 8 years. These are: JPX, Schreckling/Artes, Turbomin, AMT and Wren.

And to say that the major parts in these are the same is also totally incorrect.
Most have different shafts, many use different compressors and several have completely different bearing types. Won't comment on whether Simjet is based on Artes/Kamps design !

Don't have more time to waste explaining more, especially when you don't even use a 'real' name on RCU

Wishing everyone on RCU many happy landings in the New Year,

Mike C
(AMT Netherlands/Holland)