JOEjones31989
Seaman Apprentice
- Joined
- Jul 7, 2015
- Messages
- 34
Ok so i ordered me a tach meter for my boat last week and it finally came in today. i always thought my boat wasnt getting no where close to the RPMs it should be at WOT. so as soon as i got home today i mounted the tach and hauled but to the water and after a few trial runs to get the tach on the correct settings it was confirmed my motor is only hitting 3500 RPMs at WOT. and i can tell she has alot more to give. but here is the information i have on my boat and motor and what i have done to it so far. maybe someone can help me with the formula to figure out the prop i should put on it to get my RPMs up where they need to be and help me get on a plane faster with more top end.
the boat is a 1972 doggett industries 16FT stick steer boat. model is champ. (see pics) no one can find any information on this boat. and i dont know the acually weight of the boat.
the motor is a 1972 evinrude 85 hp electric shift.
the prop is a 13 spline prop. and thats all i know i did find these numbers on it but that is all i know about it. (RL-1086-4P is on the bottom of the prop on some type of rubber gasket)
at 3500 rpms without my dolphin phin the boat will do 30-33 MPH at WOT..... but takes for ever to get on plane like 30 - 45 secs....... but with my dolphin fin at 3500 rpms i get 27 mph at WOT wich it takes less time to get on plane but a few extra seconds to get to 27 mph.......
i have 18 gallons of fuel on the boat but this run was about 12 gals left in it. and this test i also had myself and one other person in the boat wich averages out to about 350-400 lbs....... but with myself or someone else in the boat the speed is always the same. ive done the gps speed since day one of me getting the boat it is always on.
so if someone could help me i would really apreciate the input or if you need more info i will do my best to provide it for you. btw im wanting to also know would a 3 blade or 4 blade prop be better for me. thank you everyone in advance.
the boat is a 1972 doggett industries 16FT stick steer boat. model is champ. (see pics) no one can find any information on this boat. and i dont know the acually weight of the boat.
the motor is a 1972 evinrude 85 hp electric shift.
the prop is a 13 spline prop. and thats all i know i did find these numbers on it but that is all i know about it. (RL-1086-4P is on the bottom of the prop on some type of rubber gasket)
at 3500 rpms without my dolphin phin the boat will do 30-33 MPH at WOT..... but takes for ever to get on plane like 30 - 45 secs....... but with my dolphin fin at 3500 rpms i get 27 mph at WOT wich it takes less time to get on plane but a few extra seconds to get to 27 mph.......
i have 18 gallons of fuel on the boat but this run was about 12 gals left in it. and this test i also had myself and one other person in the boat wich averages out to about 350-400 lbs....... but with myself or someone else in the boat the speed is always the same. ive done the gps speed since day one of me getting the boat it is always on.
so if someone could help me i would really apreciate the input or if you need more info i will do my best to provide it for you. btw im wanting to also know would a 3 blade or 4 blade prop be better for me. thank you everyone in advance.