Hello Axel,

(I saw your jacket hanging for some embroidery at JP, sorry we didn't meet.)
I have three Kolibris right now, and a tremendous amount of fun with them (one on a TwinJet, on a Falcon25, and on a Colt V-Jet glider).
Also, Martin's service is second to none. My Kolibris run at 243.000 RPM (out of the box).
For the retracts : there is a special tiny Jet-1A set available from Digitech Turbines, ask Sandor. These are not on his website.
Superb stuff, I have'm on my Falcon/BobCat 25.

Cheers.
Nicolas.