seanychen
If you can get a tach reading of 15x4W, I would be spooked. I would like to see how the 91 Surpass does with the 15x4W. Also, can you time the throttle response time going from idle to full throttle on this prop?
Wellll.....! so far no tach reading yet (read no tachometer

need to borrow one again) but from my MKII EARDRUM it sounds right. Maybe on the higher Rev but definitely not floating the valves. Will try to get a tachometer by next week (read buying one)

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As for throttle response there seems to be no noticeable delay from idle to full almost like my FZ63. I forgot to mention that my 91FS is the pumped version.
Happy Flying
Hisham