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| To be honest, I would suspect that 27 is about right. I currently own a Lunker Mag LTD with a 50 johnson on the back and I get 33 to 34 by myself...and the motor is max HP. The Navigator is a bit heavier than the lunker, and it is a bit wider. So...with more boat to push, the less speed you are going to have.
About the only thing I would consider looking at is your motor height and your particular prop. If the motor is in the top hole (motor "sits" on the transom) you will be able to move it up at least one hole..possibly 2 holes. My other suggestion would be to try a different prop made by Solas. It is their alcup 3 prop, which will have a larger exhaust opening than a standard OE prop. This will increase your HP due to better exhaust flow which will help keep RPM's up a little more. I found that when I tried the alcup, I was able to move the motor up off the transom 2 holes and did not lose any RPM when I went to a prop with 2 inches more in pitch and 1/4 inch more in diameter.
The navigator also has more of a V shape all the way back to the transom, which will, in effect cut down on top end speed. most fiberglass boats have a flat "Pad" that the boat rides on which allows the boat to ride higher. Other Aluminum boats have a reverse Chine (like lund's IPS and crestliner) which helps some as well...
To be honest, I would bet you are about at the best you can get. At most, you will see an increase of maybe 3 mph with the motor height change and prop swap. Let us know how things go if you decide to do some changes...
Steve | |
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