Re: ’57 Golden Javelin – fuel consumption question

[David Stanton]

Here are some more prop options at reasonable prices, but still not an 11 inch:

http://propcopropellers.com/evinrude—johnson.html

Wood boats are generally heavy compared to Aluminum and require a lower pitch prop for optimum performance

1 inch makes a big difference in performance, so 1/2 inch will be noticable. Note that as pitch goes up (unless it goes too high), top speed goes up, RPM comes down, but low end planeing and pulling up skiers and tubers suffers.

I recommend you find what RPM you are running at at wide open throttle now, compare that to the specified operating RPM that’s on the HP rating ID plate. You want to stay within that recommended range. There are portable tune up tachs that can be temporarily connected by clipping a wire around the outside of a spark plug wire without making a direct electrical connection.

Another suggestion – have you tried all the positions of the trim pin? One notch higher on the trim pin can get a lot more of the boat up and out of the water, reducing drag and increasing fuel economy. Run the pin as high as you can without the boat bouncing while going straight or cavitating (losing it’s grip and revving up) on corners. Having as much weight at the rear as possible also lets the boat ride higher, so if you r gas tank is under the front deck, consider moving it to the rear.
Dave