View Full Version : Transom hight
11-13-2002, 06:42 PM
I am going to re-do the transom on my boat and since I do a lot of running around in a shallow rocky rive I had planed to raise the transom hight some to lift the lower unit out of the water a little more. Does anyone know how this will affect the overall performance of the boat…speed and maneuverability? I want to lift it as high as possible. Any ideas?
11-13-2002, 10:44 PM
I went with a jet unit best decision I ever made!! If you want more info on jets I'd be glad to help. I have a 1752 alweld flat bottom with a 150 merc,love it!! I think transom height is 20" and with the jet trimmed down the jet is 6" below the hull. When it's on plane though I trim it up to about 3" below hull! http://www.jesseshunting.com/forums/style_emoticons/<#EMO_DIR#>/smiley-dancin-red.gif
11-13-2002, 10:49 PM
I would say raising the motor will tend to make the bow raise, if you don't have power trim that could be a problem. Also the bigger the motor/ the higher more chance of porpoising on plane. http://www.jesseshunting.com/forums/style_emoticons/<#EMO_DIR#>/afraid_face.gif
11-24-2002, 04:17 AM
If the OB is raised, the propeller will cavitate, draw air bubbles. The motors are designed to operate at a specific transome height. When running in chop the motor will cavitate more than in smooth water. Some motors can be raised or lowered by using different bolt holes in the motor bracket- usually 50+ HP type. If you need to operate in shallow water a different type hull may be the best solution, more beam and less dead rise or a flat bottom would require less draft.
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