i have tried this theory, and it is good for 1 to 1.5 after the 85 mark. so in these cases it did work. i do agree about trying every theory before commenting on it directly.

Good point.

The dimples on a golf ball move the seperation point of the air from the ball, reducing turbulence and thus drag.


This was not discovered by scientists, but, by players noticing that their well dented gutta percha golf balls traveled farther.

I don't think it will work on a boat hull bottom.

surf boards have used dimples for speed for a few years now.

Jon

Yes but on the smooth side the tile will slide from side to side much easier. America's cup boat spend more money on speed then anyone and they no longer sand the bottoms they make them as perfectly smooth as they can.

Surfboards must benefit from dimples holding contact with with water for high speed control.

I recall the ABN Amro boat won the ocean race. I saw it in Annapolis and the entire hull was dull from apparent wet sanding.

Tuff boat....my buddies Midnight is about 12000= pounds. He has quad 300 optis on a 24" set back bracket and his over revving at 6k+ with 28 B1's runing 85 on gps.

My boat is going to be extremely lighter due to resin type and foam coring. Estimated 30% lighter.

I have 36" of set back on bracket and another 12" with notched transom.

I will be must likely be going with quad 250 efis. So I plan on running the same speed 85++if not more.......

So to pose question again ...........with notched transom and set back on 24degree deep Vee how high can I go.

Max top end is the goal.

Enforcer, 36 inches and 12 inch notch. I think You'll be lucky to hit the set up on first try. Do you plan on cowlings almost touching and solid mounts? You might end up with center engines higher relative to the bottom then the outside. The outer motors will take a whopping barking in choppy water. I would think you will start with them up 9 inches or shafts even with the bottom given the are so far back. The center two maybe higher. The water will rise about 1 inch per foot of set back. I also think you'll want 3/4s of your prop in the water to carry the boat. Ultimately you may change the height a few times before your happy. If you can take pictures or measure your buddies boat it will certainly help cut down test time.

Thanks for the reply. they will be on 24" centers, the beam is 9'6, I will be most likely going with pre 2002 motors-(skinny cowlings)also due to cost of four and $$$$ trying to get most bang for buck and can't see spending 70K on new engines.

I was running my old Midnight with shafts even with bottom. I will do this again. I have been lookin at a lot of set ups. It looks like the Sutphen with quads uses 20"s on outers and 30"s on centers. But the beam is not as wide.

I also put my buddies Midnight in here, he is running 20's on outers and 25 centers. But his bracket is set up for 25 centers and he does not have a notched transom.

And also a Fountain.

We were both wondering how the water flow off of the v to notched transom and then to bracket will channge set up or effect the handling speed etc...

I have set my bracket up for 30" centers. Just wondering if I can get way with 25"s in center????

Thanks for the help ,Tony