35 ss prop help
 

I just finished my 35ss project 1994
725 HP bravo x drives

I ran the boat for the first time today with the only props I have 28 bravo 4 blade. At cruise the boat responds well to trim and the bow is nice and light but the faster the boat goes it pushes the bow down and more trim doesn't help. 80 mph at 5000 rpm .

What props are you guys running?

Have the props had work done? That doesn't sound right. It sounds to me like you may have a hook in the hull.

Props are stock new 28 bravo
I'm going to check for a hook , I checked 2 years ago when I got the hull and it was good. Boat has been blocked up inside since then so I doubt there is a hook now

Does anyone turn their props in ?

I heard turning will cause more stern lift.

I run hydromotives on my 35 and the boat runs nice and flat...they are said to be stern lifting props. my boat is only in the 70 range, but when fully trimmed at WOT the bow is light and not pushed down. sounds like a possible hook ? what year is your boat ?

No hook that I can see, boat is a 1992
Bblades recommended trying the props turning in for more bow lift. I've done that before on other boats but it makes handling around the docks poor.

The bow dropping at higher speed seems like a set up issue to me, not so much props. I would check drive alignment, put a 8' straight edge on the bottem, make sure your trim indicators are correct. Check for play in the gimbals.

New HP gimbals , hyd steering, I keep trimming until I'm loosing speed it the faster I go the harder the bow pushes

Does this mean you took a straight edge to the bottom or just eyeballed it? I don't know about the 35SS, but Sonic actually designed in a little hook for stability on some models.

is Toe in/out good ?

I think I found the problem , hook in boat inner chines have 3/16" hook 18-24" foward from the transom

It depends which way the props are turning. You want 1/8" opposite the push of the props.

That is probably it, glad you found it.

I changed the props to spin in. It's much better and I picked up 3-4 mph. I still think bow is too low

Try hydromotive props. They made the 1995 35 SS that I had pop up more on top of the water and feel more nimble. I ran 24P Hydros with my 454 Mag MPIs.

I tried props with a lot of cupping added , it didn't help 84 mph with bow really low, so I guess Monday I'll be sanding out the hook

I finished removing the hook, it wasn't too bad to do.
I also found that the foam in the hull is water logged.

I removed all the foam from the v berth through 3 deck plates and cut out the cabin floor to remove foam. Total of 300 lbs of wet foam removed .

I'm going to run the boat on sat , I hope these things get the bow to carry

I lost 5 mph
I took the hook out of the bottom and boat is slower

Does it still bury the bow?

No it doesn't burry the bow and longer , but it's strange that the boat feels like its lighter in the bow and reacts to trim better but 5 mph slower on gps. I tried the same props spinning the same way that I got 84 mph now I only get 78.8. Only difference is now I'm 100 rpm lower
I tried spinning props out again but there was no change

Were the conditions comparable? Humidity, heat, chop, etc..

It was a hot and very humid day, I didn't think that would make a 5 mph difference . But maybe there was more of an rpm lose than I noticed. I'm going to check the tune of the motors (AFR) and see if I'm loosing power somewhere