Hello all,
I have a question that’s probably been asked a thousand times but I’m having difficulty finding the info I need.
I have a 18.5’ CC SeaPro skiff style boat with a Johnson Bomadier 90HP saltwater edition running an aluminum prop OEM 177131 14x17. I have no idea what the boat will weigh but it’s heavy. I bought the boat two years ago used and have been displeased with it ever since. Once you get on plane and start to trim it up, it porpoises really bad so you had to keep it trimmed down, speed was terrible and if the water was choppy it would beat your teeth out. This week I installed some Bennet self leveling trim tabs, took it out today and it made all the difference in the world, I can actually trim it up and the porpoiseing is gone and riding in a chop is smooth. I started across the lake with a little chop on the water, boat planed out quick, started trimming the motor up, boat was picking up speed, riding and driving better than it ever has and I looked at the RPMs and it was taching between 6500-7000. I started trimming back down, that didn’t decrease RPMs so I backed the throttle off between 5000-5500. I cannot get to WOT, maybe 50% throttle, gps top speed was 32-33mph. The prop is aluminum, it’s got some dings and dents , not much of a cup. When turning sharp, the boat loses traction, I can’t decide if it’s the boat or prop blowout.
What direction do I need to go in? Increase diameter and pitch or just pitch? ?? Thanks for any help.
I have a question that’s probably been asked a thousand times but I’m having difficulty finding the info I need.
I have a 18.5’ CC SeaPro skiff style boat with a Johnson Bomadier 90HP saltwater edition running an aluminum prop OEM 177131 14x17. I have no idea what the boat will weigh but it’s heavy. I bought the boat two years ago used and have been displeased with it ever since. Once you get on plane and start to trim it up, it porpoises really bad so you had to keep it trimmed down, speed was terrible and if the water was choppy it would beat your teeth out. This week I installed some Bennet self leveling trim tabs, took it out today and it made all the difference in the world, I can actually trim it up and the porpoiseing is gone and riding in a chop is smooth. I started across the lake with a little chop on the water, boat planed out quick, started trimming the motor up, boat was picking up speed, riding and driving better than it ever has and I looked at the RPMs and it was taching between 6500-7000. I started trimming back down, that didn’t decrease RPMs so I backed the throttle off between 5000-5500. I cannot get to WOT, maybe 50% throttle, gps top speed was 32-33mph. The prop is aluminum, it’s got some dings and dents , not much of a cup. When turning sharp, the boat loses traction, I can’t decide if it’s the boat or prop blowout.
What direction do I need to go in? Increase diameter and pitch or just pitch? ?? Thanks for any help.
