Posts: 3472
Location: Elk River, Minnesota | The tail can be as high as the motor cowling and things should still be hooked up. Any higher and the motor is past parallel. You'd be able to hear it in the motor that RPMS go up, but speed does not. Some boats are heavy enough in the front for this to occur. My Ranger 617 is that way as the tank is up front in the bow.
Being the motor is not broken in....I would wait and retest when break in is fully complete. You cannot be too far away from that point I would assume...
I wouldn't be surprised with the tempest prop that you would be able to have the motor mounted in the top hole and it would still bite well and corner fine with a little trimming down. Hole shot would most likely be a little better as well when the motor is tucked in too. Less leg in the water at holeshot will get the bow pushed over faster on top of the water. Also, are your vent holes completely covered, open or partially? That can be a huge aspect in this as well.
One other thing to consider... take a straight edge and put it on the bottom of the hull with the edge coming past the transom. Is it completely flat? Is there a small gap in front of the transom edge? Is there a gap AT the transom edge? These also need to be checked. If the hull has a hook in it, it will not plane as well and the boat will always run really flat to the water increasing surface area and drag. With a hull that has a gap right at the transom but flat in front of it, the boat might have a tendency to porpoise. It is a really fine line...
Take an hour or so for just yourself, your gear and a full tank of gas to a lake big enough to open up and get to full speed for a bit. If you have different vent hole plugs, try them and see what they do both for holeshot and top speed. Lots of options yet to consider here... In most cases the vent holes should not be an issue at speed as the gasses are moving too fast to come out the holes, venting the prop. And...in your situation, I am guessing they are completely plugged given your numbers are accurate.
Also...every boat and motor combination will be different. even when the boats are made from the same mold, they will not perform exactly the same.
Steve
Edited by VMS 6/22/2021 8:31 AM
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