Francis I have a pair of tt25pros in a twin star it has 9x7 wood zingers, I have not flown the plane yet but as I remember they transitioned well could bal rpms and think turned at least 10K, I hope to fly it in the next month, It is altogether and static tested, Davis predicts it will be a sky rocket with this setup cannot give any answers on the 28s since I do not have any,the TTS look good however martin
yes they have Davis diesel heads
I will try some 3 blades, ground clearance limits me to to 9 inch props