Cat trim tabs?

[Craig]

Anyone ever tried hydraulic trim tabs on the outer sponsons of a single engine cat? I used to have them over the tunnels and they worked great helping the boat roll on plane when running a big prop.
But when I went with dual ram steering, they had to go because they were in the way. Went with a fixed tunnel tab. So my Advantage has never been a rocket out of the hole and last week running a 31 Hydromotive (1.36 gears) with three people, full tanks and coolers she struggled to get up. So I started thinking about fixes short of running a smaller prop or a 5-blade.
I still have the complete Bennet set up in the garage, wiring even still run. Just don't want to drill holes if it wont help getting on plane. Then would I mount them to the ouside of the sponson, middle or in toward the tunnel????
Craig

[gmocnik]

i am using the dana marine sponson tabs on my 25 daytona...really helps rolling the boat on plane and has helped with the 60-70 mph porpoise...they were pretty spendy but they do the job...

[Craig]

You have any pictures of them on your boat? They don't have any on Dana site

[welk2party]

Keep us posted. I have wondered about tunnel tabs for my boat as well. Pretty expensive, so I would love to know before I spent the cash.

[Craig]

Tunnel tabs aren't that expensive unless you want them hydraulic. Ones that I have over the tunnel were about $600.
http://www.justanothertoy.com/photog...f/P3143618.JPG
I'd like a set on the outside. I have a flat surface to mount them. The sponsons look flat, but they're just notched, the angled portion is about 8" forward of the transom.

[rude235]

Originally posted by gmocnik
i am using the dana marine sponson tabs on my 25 daytona...really helps rolling the boat on plane and has helped with the 60-70 mph porpoise...they were pretty spendy but they do the job...
i don't remember where i read the article, but it mentioned they work great for hole shots, and low speed cruising speeds for skiing/etc. the individual who wrote the article said they'd never own a tunnel without them. did it completely get rid of your porpoise in the 60-70mph range?? i've got the same problem.

[Charley]

Craig...why are you thinking of putting them on the outer sponsons?? It would probably give you a longer running surface, but it seems like it would also act in the opposite way of an extension box(dirty water)... just my thoughts

[Craig]

Originally posted by Charley
Craig...why are you thinking of putting them on the outer sponsons?? It would probably give you a longer running surface, but it seems like it would also act in the opposite way of an extension box(dirty water)... just my thoughts
There's no where else I could put them The area above the tunnels have my fixed tabs. There's not enough room to put adjustable ones there because of the location of the steering rams. I was thinking of putting them on the sponon in this area;
http://www.hotboatpics.com/pics/data/500/30tab.jpg