Hi guys, I've read just about every post on here for set-up for a Checkmate Starflite and am wondering if there are any suggestions to break the 80 mph mark. My boat is a 1987 with a newer interior done well but I would assume about as light as it was from the factory. I have one battery on the starboard side, oil tank on the port side, 30 gallon stock fuel tank in the center.
1998 Pro Max 300
6" hydraulic jack plate off of a Allison which I only know as it has Allison machined on the side
26p Trophy Plus prop
1.75 torque master LU
dual cable steering tightened to fight itself slightly
hot foot
mercury racing RPM gauge, autometer GPS speedometer
15 psi of water pressure
Top GPS speed achieved so far is 75.4 at 6000 RPM (RPM from when I glanced) with gnarly chine walk. Only me in the boat light chop with probably 8mph wind at my back. That would be prop slip of 10.66% (which is great, no?). I was running the motor at least 1" above the bottom of the V to achieve this. Rooster tail at about even with my cowling when I look in the rear view mirror.
Everything I read on here is the motor has to be roughly .5"-2" below the bottom of the V for top speeds. But if I run anywhere close to that the chine walk to is too bad for me. I've had the boat for two years and so have had a decent amount of seat time but no matter what I seem to do with the steering wheel I can't fix the chine walk before it happens when I get to 72-75mph. I tried running a 27p 3-blade TXP with my buddy in the boat to even out the weight but at .5" below the pad I couldn't pull the prop and struggled to get past 70MPH to where it would even start walking. Which surprised me. Best I could do is 71MPH at 5500 RPM 11.63% slip. My hope is going higher pitch was going to help me blast through the chine walk but even if I tried running the prop higher it would then just slip. I've tried turning the boat slightly as well but that hasn't seemed to help with the walk. Any prop suggestions that have helped with walk? Is running the motor as high as I am hurting top speed?
1998 Pro Max 300
6" hydraulic jack plate off of a Allison which I only know as it has Allison machined on the side
26p Trophy Plus prop
1.75 torque master LU
dual cable steering tightened to fight itself slightly
hot foot
mercury racing RPM gauge, autometer GPS speedometer
15 psi of water pressure
Top GPS speed achieved so far is 75.4 at 6000 RPM (RPM from when I glanced) with gnarly chine walk. Only me in the boat light chop with probably 8mph wind at my back. That would be prop slip of 10.66% (which is great, no?). I was running the motor at least 1" above the bottom of the V to achieve this. Rooster tail at about even with my cowling when I look in the rear view mirror.
Everything I read on here is the motor has to be roughly .5"-2" below the bottom of the V for top speeds. But if I run anywhere close to that the chine walk to is too bad for me. I've had the boat for two years and so have had a decent amount of seat time but no matter what I seem to do with the steering wheel I can't fix the chine walk before it happens when I get to 72-75mph. I tried running a 27p 3-blade TXP with my buddy in the boat to even out the weight but at .5" below the pad I couldn't pull the prop and struggled to get past 70MPH to where it would even start walking. Which surprised me. Best I could do is 71MPH at 5500 RPM 11.63% slip. My hope is going higher pitch was going to help me blast through the chine walk but even if I tried running the prop higher it would then just slip. I've tried turning the boat slightly as well but that hasn't seemed to help with the walk. Any prop suggestions that have helped with walk? Is running the motor as high as I am hurting top speed?
