Frank...LOL...I thought Donzi had come up with the Atomic ZX with those numbers My set-up is not far off from yours, I couldn't figure out the big difference between us single engine folks...

4,000 RPM is 63 MPH GPS ...

3200=45
3500=52
5600=90
85 Chris cat I havent paid much att at other speeds I can keep it on plane down to about 25 or 26 at around 26oo rpm 30 mph I think happens at 2800.

Sunsation Dominator 6200 lbs. dry

Typical cruising with 1/2 to full tank and three passengers:
Bravo I with 1.5 ratio and box stock 32 pitch Bravo props.

3100 = 54 - 55 mph
3800 = 67 - 68 mph
4000 = 71 - 72 mph

-Bayley

Chris Cat

3,500 75 mph (cruise)