Lehner do custom builds, the hollow shaft is a pretty common Lehner customisation for Naviga racers with deep pockets, avoiding the coupling not only reduces the boats weight, but the lower inertia of the drive takes less power to spin up.
It is a bit of a strange build though, not a Naviga one for sure, the KV is consistant with a 3s mono1 or hydro1 25"ish <2.5lb boats, but much bigger, we would use a 1530, 1535 or 1920.
I wouldn't use it on 6s, is it a high amp? Maybe if it is a high amp variant you could get away with running SAWs with it for a while, but with over 60K rpm loaded you will be using a tiny prop to try to avoid burning it or your ESC, which would be very inneficient pushing along a big and heavy unstepped RTR. Honestly if you want to run 6s, selling it and buying even the cheapest of cheap Chinese motors with about half the KV would net you better performance.
Oval sprinting on 3s or SAWs on 4s would be much more appropriate for it.
Paul Upton-Taylor, Greased Weasel Racing.
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