LOTS of prop slip
 

I have a 32 fever with twin 525's and x drives and i get nothing but noise out of the last 600 rpm i run 80 mph at 4600 rpm and 81 at 5200 rpm tabs up trimed all the way out im running 32p bravos do i need to go up to 34's and lose my rpm's or try a five blade set up??

Sounds like you're over trimming the drives.

My experience with a 5 blade on my Nordic results in less then steller performance. It seems like I am getting an undesireable stern lift. I like the bravos better. Just my 02. Don't want you to spend $ on props that you may not like. See if you can borrow a set before you purchase.

This is the first fountian i have driven so this is possable but at 4600rpm the drives are only at like the 5 and the boat is running very flat with with little air under the boat

Might be out of HP, over trimming brings up the RPM with no real speed gain, just a guess.

I have talked to several people that have these boats and the dealer where i bought it from, lake cumberland marine, and they all say that boat with that engin combo should run in the mid 90's but low 80's is all i get is that an unreal expectation for this boat

Ok, so I dont really know a whole lot about boat mechanicals but I have been mostly lurking on this website for a couple years now... so take this for what its worth...

My first thought would be to check the hub by marking the prop... I know its an unlikely problem considering you have plenty of power to get you up to 4600 RPM but its a cheap check to eliminate any possiblity of having a problem there. I dont know, that may very well be absurd... just trying to help.

probably absurd... hahaha! Good luck!

x2

I think you have the HP you just ran out of TQ. You might need to step down in prop to keep the best trim angle and to get you into the peak HP band. My boat runs 4-5mph faster with a smaller prop at peak HP 6200RPM vs 5500 cruising prop.

It sounds to me like you might need some 1/2-1" drive spacers. I assume you are trimming up more to get from the 4600rpms to 5200rpms.

Yes i am triming out to get air under the hull and let the steps do there job and lift the hull the boat comes up and runs on the keel pad like it should it just dosent gain any speed

It sounds like when it lifts, that the props are losing bite and slipping more. A 1/2" or 1" spacer will do a lot. Are you throwing a decent rooster tail when trimmed up???

No not really throwing any at all

Something is definately strange about your issue. If you're not really throwing a rooster tail when trimmed up, then the dirve height should be fine.
Your prop slip at 4600rpms is 11% and at 5200rpms its at 21%. If you kept the 11%, then you'd be at 91mph.
Are your speeds on a gps????
Have you tried subtle changes in the trim when trimming up...like a 1/2 number at a time. Fountains are designed to run flat. Let the steps do their job. How high are you trimming???? The indicator only goes to 7 on Fountains. You should probably be around the 6 for max trim.

bblades .com 920-295-4435. You will get an answer to your problem..:whistle:

Yes the speed is on gps my indicators go up to 8 and and on 5 at wot the boat is running very flat and 81 mph at 4600 rpm if i go up to a 7 1/2 or an 8 it picks up and starts to air out and gets the rpm up where they should be 5000 to 5150 if the boat should run more flat like it dose at the 5 or 6 position would dropping down in props and getting into the rite rpm range there help

I went through a slew of props for my boat. Not a stepped hull, but I get 89 with 525's and 7 people. Trimming up to much will actually loose speed, but RPM's will go up. You DO HAVE too much slip. You also need some hulll lenght in the water to provide lift. 525's actuallyput out about 550-560 on the dino. some more some less. YOur horses are ok. but I think it's a trim issue. Try to use 32 labbed keep the drive neutral or a bit up and lower your tab a bit. This will keep your RPM's up. gettiing all the ponies, and still get your lift having enough hull lenght you want to have your prop shaft parrallel to the water as much as you can. Trimming to high your props will "dig" nto the water instead of pushing you forward. Pushing stern down, won't get you speed, keep experimenting. you should run 90. You might try spinning in.