I have a large gas outboard and I noticed that the mount has verticle slots in it and was told that is there to control the depth the prop is at. So where do I start? I have heard of people bringing the props partially out of the water. Excuse my ignorance as for i am new, but it is truely ignorant NOT to ask!

what prop are you using? i would start with the prop hub about 3/16 under the hull and go up from there.

I am using a Prather 270 on a large Tunnel Hull. The Outboard seems to sit pretty low in the water and maybe even drags a bit until it has built up enough speed. Look in my gallery and you will see the large unit on the big boat (Mercury scale piece).Thanks for helping..

I'd start it slightly above the bottom of the sponsons. If you have a leaf type Diningroom table, open it up enough to let the lower unit hang through it or use a board with a slot cut into it. Anyway, adjust the motor so that the top of the skeg is just above the table. Tunnel hulls vary on their setups a little, but this should put you in the neighborhood.

Thankyou, now i can't wait to get to the lake, AGAIN!