I'm running a 15 foot tull hull flat bottom with a 25hp evinrude.
I bought the evinrude for the boat a couple of months ago and had the transform cut a couple of inches because the prop wasn't in the water enough. With the motor lowered I picked up a lot more speed and runs much better. Tops out at 32 unloaded on the best conditions. I'm on the water by myself most of the time and a couple of things I've noticed.
Unless I keep my battery in the front of the boat it will porpoise bad. Battery in front with me and the gas tank in the back it'll run fine. While I can operate with the existing cavitation I don't think it's operating at its fullest performance. At high speeds slight to moderate left turns will make it cavitate. At hard right turns it will cavitate (assuming the difference is due to weight distribution on me sitting on the right on the motor). If I'm following somebody or vis verse they can make that turn a lot faster and I never had the same problem with my old motor running wide open around the same turns. When I'm making a left turn and it starts to cavitate, there is water coming over the right top of antiventilation plate. Not sure about left side bc I can't see it from sitting. The few times I have someone plus ice chest and gear with me there is no cavitation. Running about 25 when weighted down.
Unless I am mistaken I believe the antiventilation plate should be even with the top of the tunnel hull. Right now it sits about 1.5 inches from the top of the tunnel. Just to see what would happen I added a .5 inch piece of wood under the motor and tested it. Running wide open and straight it would start to cavitate. Should the antiventilation be positioned at the top of the hull because moving it closer seemed to make it worse?
Someone has suggested getting the prop cupped and after reading through other forums I've thought about adding a hydrofin. Any suggestions?
I bought the evinrude for the boat a couple of months ago and had the transform cut a couple of inches because the prop wasn't in the water enough. With the motor lowered I picked up a lot more speed and runs much better. Tops out at 32 unloaded on the best conditions. I'm on the water by myself most of the time and a couple of things I've noticed.
Unless I keep my battery in the front of the boat it will porpoise bad. Battery in front with me and the gas tank in the back it'll run fine. While I can operate with the existing cavitation I don't think it's operating at its fullest performance. At high speeds slight to moderate left turns will make it cavitate. At hard right turns it will cavitate (assuming the difference is due to weight distribution on me sitting on the right on the motor). If I'm following somebody or vis verse they can make that turn a lot faster and I never had the same problem with my old motor running wide open around the same turns. When I'm making a left turn and it starts to cavitate, there is water coming over the right top of antiventilation plate. Not sure about left side bc I can't see it from sitting. The few times I have someone plus ice chest and gear with me there is no cavitation. Running about 25 when weighted down.
Unless I am mistaken I believe the antiventilation plate should be even with the top of the tunnel hull. Right now it sits about 1.5 inches from the top of the tunnel. Just to see what would happen I added a .5 inch piece of wood under the motor and tested it. Running wide open and straight it would start to cavitate. Should the antiventilation be positioned at the top of the hull because moving it closer seemed to make it worse?
Someone has suggested getting the prop cupped and after reading through other forums I've thought about adding a hydrofin. Any suggestions?