Posts: 3508
Location: Elk River, Minnesota | Hiya!!
First a couple of questions for both parties who have the porpoising issues...
What motor, gear ratio and Full throttle RPM's are you currently getting?
What prop are you running (brand, model, diameter and pitch)?
In most cases of a boat that is porpoising, the most likely cause is too low of RPM/over pitched propeller for the boat you have. I am not anywhere near as familiar with Tuffy boats as Steve Worrall so his suggestion of wedges is one I would do... If porpoising is still happening, I would bet the prop is too steep for the motor.
Lifting the motor off the transom is always good, as most are too low on the transom for optimum performance. There is a trade-off, though... The higher you go, you gain RPM's, but you are also increasing slip, so the offset may or may not work, and you will lose some handling capabilities at optimum trim (you'd have to trim down to make a good turn or the prop blows out).
As Steve stated, a steel prop will help as the bite of a good steel prop will always be better than a stock aluminum, which usually allows for raising the motor off the transom to get some RPM's back with minimal loss of handling.
If you can supply those values listed above, we can figure out the porpoising issue and get it gone...
Steve |
