I just installed the 283 Kiev on my Kitfox IV - 1200 912S. I had a 72" Warp Drive and I am not happy with what I have done. I have tweaked the pitch settings a few times and am unable to find a spot where it will compare to the Warp. That ugly old Warp is a performer! I will keep this thing on for a bit, but I am sure it will go up for sale (cheap). It is very smooth and quiet, and the start up is way nicer. But performance is what matters to me and the airspeed and vsi are saying get rid of it. If anyone has a static rpm or pitch that they think is magical I'll try it, but otherwise not impressed.
It looks great, but that is not enough for me. I am glad I still have the Warp.
Kelly