Home › Forum › Ask A Member › Thrust, hp, and weight comparisons › Reply To: Thrust, hp, and weight comparisons
Good thoughts about the prop. The prop that is on the motor is the same one used from the beginning of Mom and Dad buying the boat and motor back in the 1950s. It is the same one that used to give a speedometer reading of about 29mph. Now we are getting about 15mph. (That is a pitot tube reading, and the pitot pickup that sticks own in the water has been changed, hoping that maybe that at fault. But we get the same result with the old and new pitot sensor.) What the numbers are on the speedometer in MPH, of course, is less important than whether the boat is really moving as fast as in the past. We used to water ski behind the boat, but I’m not sure that would be possible at its current speed. It is just not as fast.
That is a good tip about the trim rod adjustment. I will investigate that.
A new thought is that we have noticed that at full throttle on the water, if we press the throttle cable really hard, the beveled gear at the bottom of the port side that is turned by the cable will move just a little bit more. That, in turn, will move the vertical shaft that reaches up under the flywheel a little more, and the speed will be a little bit faster. I am thinking that the gear that is turned by the cable may be “off” by one tooth. I want to study some about how to re-position that. I know, already, that the gear at the bottom of the vertical shaft will sit in a groove only one way, so I am guessing that the beveled gear that is turned by the cable is the one that would have to be re-positioned.