'57 Lark Anti-cav plate height??

[cheburashka]

Finally got my '61 Glasspar G3 in the water with a '57 Lark. Once I got the throttle dialed in and fooled with the motor angle, I was able to get it up onto plane pretty easily. The problem I'm having is that this boat rides with the nose very high, so even though the anti-cavitation plane is level with the bottom of the boat, when I'm on plane it sits around 2" below the surface of the water. It's hard to measure, since when I go to the rear to check, the weight distribution changes, but I'm certain that the plane sits below water level when I'm at full throttle. The boat makes a huge wake for such a small boat. Where does the anti-cavitation plane usually sit in relation to the level of the water at the rear of the boat? When the boat is on plane, should the driveshaft tower be perpendicular to the water?<br /><br />Thanks for your help,<br /><br /><br />Steve

 

[wilde1j]

Re: '57 Lark Anti-cav plate height??

The cav plate should be even with or slightly higher than the hull bottom. You can only tell if it's OK when the boat is out of the water. Motor trim should so the boat has a very slight tendency to porpoise at WOT. If it's bow high, move the pin closer to the boat.

 

[cheburashka]

Re: '57 Lark Anti-cav plate height??

The reason I ask is that the G3 is a hard one to figure out. The hull has a flat portion in the rear that it's meant to ride on, and when it's on plane, the front portion is designed to ride high. This means that if I set the cavitation plate in line with the keel, once the boat gets up on plane, the plate is too low and the trim is wrong. I'd like to set it so that it's at its most efficient when the boat is on plane. Do most boats end up with the cavitation plate level with the water once the boat is up on plane?