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-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   1997 fountain 38 with 22% prop slip (https://www.offshoreonly.com/forums/general-boating-discussion/315722-1997-fountain-38-22%25-prop-slip.html)

4bus 07-23-2014 09:44 AM
Originally Posted by Nmca_chevy (Post 4158314)
I was thinking the same thing that the boat should run 10MPH faster. Drives have drive showers. I am not sure what you mean by check the haul for hook. I will do a google search to find out what that means haha!

We are rookies when it comes to boating....we are only capable of swapping motors because of our extensive drag racing back ground. If you want to talk small tire drag radial racing I wont sound so uneducated.

thanks for the help!
What they are asking you to check for is large depressions in the bottom of the hull, usually not native to a performance boat....they are cause by using a trailer with bunks that fall short of the transom. Check the bottom with a straight edge, the depressions will disturb the water making it hard to hook up at higher speed. Also they are asking you to check for water pickups that could also be disturbing the water, also causing slip.

Getting a straight bottom fountain down to 15 percent slip or less is very possible. I can tell you with the -2 short lowers you should be looking at 5 blade props to get that slip down. Slip is speed, but single digit slip can very hard on the drives as well. 22 percent is excessive.

IMO something is seriously off somewhere if you are truly making 750hp. The 38 fever straight bottom is not the most efficient hull made, but 750hp a side is a lot of ponies.

Example. I spin my 32 4 blades at 5750 summer and right to 5850 rev limit (and would go more) in the cool, 14.5 slip, 98-100 mph, around 700 crank HP. Standard length lowers on a twin big step 38 lightning side by side.

Nmca_chevy 07-23-2014 10:12 AM
Originally Posted by 4bus (Post 4158383)
What they are asking you to check for is large depressions in the bottom of the hull, usually not native to a performance boat....they are cause by using a trailer with bunks that fall short of the transom. Check the bottom with a straight edge, the depressions will disturb the water making it hard to hook up at higher speed. Also they are asking you to check for water pickups that could also be disturbing the water, also causing slip.

Getting a straight bottom fountain down to 15 percent slip or less is very possible. I can tell you with the -2 short lowers you should be looking at 5 blade props to get that slip down. Slip is speed, but single digit slip can very hard on the drives as well. 22 percent is excessive.

IMO something is seriously off somewhere if you are truly making 750hp. The 38 fever straight bottom is not the most efficient hull made, but 750hp a side is a lot of ponies.

Example. I spin my 32 4 blades at 5750 summer and right to 5850 rev limit (and would go more) in the cool, 14.5 slip, 98-100 mph, around 700 crank HP. Standard length lowers on a twin big step 38 lightning side by side.

I will do some checking tonight and get back. I really appreciate the help.

Marginmn 07-23-2014 10:32 AM
Originally Posted by 4bus (Post 4158383)
What they are asking you to check for is large depressions in the bottom of the hull, usually not native to a performance boat....they are cause by using a trailer with bunks that fall short of the transom. Check the bottom with a straight edge, the depressions will disturb the water making it hard to hook up at higher speed. Also they are asking you to check for water pickups that could also be disturbing the water, also causing slip.

Getting a straight bottom fountain down to 15 percent slip or less is very possible. I can tell you with the -2 short lowers you should be looking at 5 blade props to get that slip down. Slip is speed, but single digit slip can very hard on the drives as well. 22 percent is excessive.

IMO something is seriously off somewhere if you are truly making 750hp. The 38 fever straight bottom is not the most efficient hull made, but 750hp a side is a lot of ponies.

Example. I spin my 32 4 blades at 5750 summer and right to 5850 rev limit (and would go more) in the cool, 14.5 slip, 98-100 mph, around 700 crank HP. Standard length lowers on a twin big step 38 lightning side by side.
1997 38 Fountains are not straight bottom boats - they are first generation stepped.

payuppsucker 07-23-2014 10:53 AM
Originally Posted by Nmca_chevy (Post 4158314)
I was thinking the same thing that the boat should run 10MPH faster. Drives have drive showers. I am not sure what you mean by check the haul for hook. I will do a google search to find out what that means haha!

We are rookies when it comes to boating....we are only capable of swapping motors because of our extensive drag racing back ground. If you want to talk small tire drag radial racing I wont sound so uneducated.

thanks for the help!
Properly trimmed? You said you were rookies so the question needs to be asked.

Nmca_chevy 07-23-2014 11:00 AM
Originally Posted by payuppsucker (Post 4158452)
Properly trimmed? You said you were rookies so the question needs to be asked.
Boat needs to trim indicator cables. Was trimmed up until it wouldn't go any faster then back down some. We were trimmed to where the boat ran the fastest.

Ask away because I'm hoping we have something stupid going on.

Nmca_chevy 07-23-2014 11:03 AM
Originally Posted by 4bus (Post 4158383)
What they are asking you to check for is large depressions in the bottom of the hull, usually not native to a performance boat....they are cause by using a trailer with bunks that fall short of the transom. Check the bottom with a straight edge, the depressions will disturb the water making it hard to hook up at higher speed. Also they are asking you to check for water pickups that could also be disturbing the water, also causing slip.

Getting a straight bottom fountain down to 15 percent slip or less is very possible. I can tell you with the -2 short lowers you should be looking at 5 blade props to get that slip down. Slip is speed, but single digit slip can very hard on the drives as well. 22 percent is excessive.

IMO something is seriously off somewhere if you are truly making 750hp. The 38 fever straight bottom is not the most efficient hull made, but 750hp a side is a lot of ponies.

Example. I spin my 32 4 blades at 5750 summer and right to 5850 rev limit (and would go more) in the cool, 14.5 slip, 98-100 mph, around 700 crank HP. Standard length lowers on a twin big step 38 lightning side by side.

Water pick ups are about 6inches either side of drain plug. Stick down even with bottom of boat

12meter joe 07-23-2014 11:12 AM
Did you check the cabin really good for a bunch of bikini bottoms? It is a Fountain. Im guessing thats the problem.

bcfountain 07-23-2014 12:42 PM
Originally Posted by 12meter joe (Post 4158470)
Did you check the cabin really good for a bunch of bikini bottoms? It is a Fountain. Im guessing thats the problem.
you could b rite joe....hoes bags tend to be caught migrating down below if you know what I mean.:lolhit:

Nmca_chevy 07-23-2014 01:21 PM
Originally Posted by MILD THUNDER (Post 4158265)
Which way are the props rotating?
Port side counter clock wise
Starboard clockwise

payuppsucker 07-23-2014 01:23 PM
Originally Posted by Nmca_chevy (Post 4158462)
Boat needs to trim indicator cables. Was trimmed up until it wouldn't go any faster then back down some. We were trimmed to where the boat ran the fastest.

Ask away because I'm hoping we have something stupid going on.
What about your tabs? Were they up or at least neutral?


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