Search results

  1. P

    High Prop slippage help

    Boat is a 22' Prokat Catamaran, Yamaha F115's counter rotating, 2.15 gear ratio. I have calculated at 4500 RPM, I am getting 25 MPH, which equates to 27% slip. I have stainless props that are 17" pitch, I do not know the diameter, I would guess 13.25". At top end 5800 rpm I am getting 38 MPH...
  2. P

    Seastar hydraulic tie bar

    I have twin engine with hydraulic tie bar steering. My engines constantly need to be aligned, usually twice a day while on the water. I have replaced the ram seals and there is no leakage, bled the system according to Seastar instructions and still have this issue. I can move both engines...
  3. P

    Yamaha 115 low rpm's

    2001 Prokat, 115 HP Yamaha 4 strokes, counter rotating, swinging 13.25 x 17" ss props. Boat new to me, low hours 325. Just did 200 hr service. Boat runs great uo to 4800 rpm port and 5200 rpm stbd. Cannot find an issue to have low rpm's at full throttle. Last 1" of throttle push does not...
Top