Re: What's causing the boat to list?
 

Don, Thanks for getting back to me. I checked the hull with a four foot level, and nothing unusual. The boat is sitting on a bunk trailer. I measured the motor mount, 33 inches from port to motor mount and 32 inches from starboard side to motor mount. Could that one inch offset cause that much of a problem?

Also, the boat settles down with a full load of gas, only as it empties does the problem get worse. The tabs don't completely push it over, and if I trim it too hard with the tabs it just dumps the bow down and still dives to port. Craziest thing I've ever seen. Regardless of the trim positioning of the motor, the problem is persistent. It is mounted on the highest hole on the motor mount, no pin on my Merc. And its a 175 so no problem with power, it will top out near 50 mph. Any other ideas? Also it has a four blade prop. and a big T-top on it, but I don't think that would cause the problem. Jason [img]images/icons/confused.gif[/img]

Re: What's causing the boat to list?
 

Like Don said there is a good chance the bottom developed a hook to it causing this problem. It is hard to find and is best done by someone that knows what to look for. Most of your fiberglass shops can make this type of repair.

Re: What's causing the boat to list?
 

Thanks Scott - much appreciated. I will try adjusting slightly.

Re: What's causing the boat to list?
 

You have a big motor for that size boat. The newer motors hp is rated at the prop. That is a lot of torque coupled with a four bladed prop (you do not mention dia. or pitch but I assume it may be around 14x19 maybe somewhat less). Stainless props do not flex too much which is why they are great for heavier boats, I assume you have a SS prop too. The bottom line may be that you have too much prop for your boat. Most runabouts that have clockwise rotation props also have the driver sitting on the starboard side of the boat. This counteracts the torque trying to rotate the boat to port (around the axis of the propeller) CCW rotating props have the driver sitting on the port side of the boat. CC's have the driver along the centerline of the boat so now you do not have the weight of the driver to balance things out. The engine being off center and the T top may make a bad situation worse. Also check to see if you have any water in the bilge. Water weighs about 8 pounds per gallon, so it does not take much to add a lot of weight to one side if it shifts (I doubt this is your problem but I have seen some really odd things). Try using a three bladed prop if you can get hold of one. Good Luck!