The term for the slow pull to one side is called prop walk. You could use a relatively small fin (like the size of a playing card), make the fin movable like a rudder with a way to tighten a bolt to fix it at the angle you want to compensate for the prop walk. Trial and error adjustments. Also, if you were to put a real engineered propeller, i recommend a two blade although Honda has a three blade small enough to work very well on a 2hp four stroke suitcase motor i used to own. Regret ever letting that motor go! Add yourself a rudder and do all that you can to keep your center of gravity as low as possible. Id pump marine grease into your bearing tube. It will work much
2:35 If you decide to fill the prop tube (stuffing box) with anything, I'd recommend heavy marine grease. Your bearings will love it, it'll stay put...for the most part, and it'll block most water from creeping past the bearings. Cool project!
Those 4 stroke motor turn at a slow 3600 RPM max ....with NO load . Do your self a favor and get atleast a 5HP with a real 2 blade outboard motor prop to bring RPM up . 3 blade prop is way too much on lawn mower engine . Then you will see max performance at its best ! Get rid of the round prop housing . It's costing you drag and making the boat veering on one side . Hope this help .
The term for the slow pull to one side is called prop walk. You could use a relatively small fin (like the size of a playing card), make the fin movable like a rudder with a way to tighten a bolt to fix it at the angle you want to compensate for the prop walk. Trial and error adjustments. Also, if you were to put a real engineered propeller, i recommend a two blade although Honda has a three blade small enough to work very well on a 2hp four stroke suitcase motor i used to own. Regret ever letting that motor go! Add yourself a rudder and do all that you can to keep your center of gravity as low as possible. Id pump marine grease into your bearing tube. It will work much
2:35 If you decide to fill the prop tube (stuffing box) with anything, I'd recommend heavy marine grease. Your bearings will love it, it'll stay put...for the most part, and it'll block most water from creeping past the bearings. Cool project!
My family used to do that to Pirogues with a little rudder on the back pitch
That does not look like the 300 mph you were hoping for.
Install a rudder.
Good job.
Nice now you will see that you want to build a lot of these engines
Those 4 stroke motor turn at a slow 3600 RPM max ....with NO load . Do your self a favor and get atleast a 5HP with a real 2 blade outboard motor prop to bring RPM up . 3 blade prop is way too much on lawn mower engine . Then you will see max performance at its best ! Get rid of the round prop housing . It's costing you drag and making the boat veering on one side .
Hope this help .
Stick a homemade rudder on either side.
Second person to comment on this video.