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I could use some suggestions. My little skiff will porpoise when trimmed up more than just a little bit even with the hydrofoil on the motor and as much weight moved forward as possible.. It will run close to 40 wide open as is but I should be able to trim it higher to get the best performance and run in shallower water and I can't without it porpoising so I'd like to install smart tabs or something else to stop the porpoising but the boat has a narrow beam and I don't think there is enough room on the transom for smart tabs. I don't need the speedometer pick up on the port side so I can remove that but I need to keep the transducer on the starboard side. Are there any other options? Do they make or could I fabricate a set of small stationary tabs and would that even work?

Do you have a jackplate? If not, do that first. Otherwise, what position is the motor in? move it up one hole. If you don't have a jackplate that should be your first step, as the setback will allow greater efficiency of the motor and help minimize the porpoising.

I was having the same problem with my boat. It's a 22 skeeter bay boat with a mechanical jack plate. Had a set of limited space trim tabs installed and wow what a difference they made. Now you sit down and hold the ----- on. Hope this helps.

Tabs won't help much with that minimal deadrise hull (flat). Volvo does make some fixed blade type that extend straight up and down. Not sure the size or cost would be feasible for your application though.

Agree with Chris. First things I'd try would be raising the engine and/or adding a manual jack plate. Most boats are rigged with the outboard cavitation plate level or only slightly above the bottom of the transom for optimum performance.

I put on a stern lifting 4 blade power tech prop on my pathfinder and it instantly resolved all of my porpoising problems( which required constantly trimming my bow all the way down). It also helped with blowing out in turns and I can run my Jack plate all the way up( before I could only go 2 inches). Call Powertech and they will tell you if they can help.

Thanks, I appreciate the replies. That's what I love about this forum, everyone is always willing to help! I hadn't thought of some of those options. I don't think I want the added weight of a jack plate but motor height may be the problem since it's mounted as low as it will go and I thought raising it would only make the porpoising worse. The cavitation plate appears to be flush with flow line of the transom but I'll try raising the motor a little and see if it helps before exploring the other options.
Thanks again...

Try a 4 blade prop.
I know on my boat, moving the motor up makes the porpoising worse, and moving it down improves the position.

Sell the boat.

Juan wrote:Thanks, I appreciate the replies. That's what I love about this forum, everyone is always willing to help!

Well, "ALMOST" everyone.

Srbenda wrote:Try a 4 blade prop.
I know on my boat, moving the motor up makes the porpoising worse, and moving it down improves the position.

That's what I was thinking would happen to mine but it was bottomed out so I just finished moving it up one notch. If that doesn't make it better, I'll be hunting for a 4 blade. Thanks

Love my 4 blade. Lost barely anything, if at all, from the top. But man is she torquey and def rides higher in the water at lower speeds. I didn't have porpoising issues, but for skiffs... they'rea great upgrade regardless

sent from the Ketchup Packet

THANKS guys!! The advice to raise the motor was right on. I raised it one hole (about 2") took it to the river and tried it out and now it's perfect! My wife must be an outboard mechanic. When I told her I had raised it two inches, she said it's amazing what an extra two inches can do!

A very cheap fix, and you get to keep your boat. A good day!
D

Juan wrote:THANKS guys!! The advice to raise the motor was right on. I raised it one hole (about 2") took it to the river and tried it out and now it's perfect! My wife must be an outboard mechanic. When I told her I had raised it two inches, she said it's amazing what an extra two inches can do!