Drag induced from a small contact area on each tab is less than the drag induced from the total area from each rocker plate in constant contact with the water. If both are able to alter the flow of water past the hull downward, and and thus force the stern up and the bow down, why not choose the tab that creates less drag?

I understand the ease or correcting a problem with a simple bolt on. But why add wetted surface when either rocker or hook can be added or removed from the hull, or the cg can be changed?

Rocker Plates

you don't necessarily add surface. Big boats, as well as the big cat shown above, use them integrated into the hull design.

Look at big sport fishing boats, most use the rocker design in some fashion, except more simplified.

Because you can add or remove rocker/hook INSTANTLY and choose how much you want to add/remove. The benefit isn't from the added wetted surface(although with some boats it would help), the benefit is the added wetted surface can be instantly adjusted.

The theory behind them is using them for hook will give you more stern lift with less drag than a K-plane=more speed and using them for rocker will give you more bow lift with less positeve trim-more speed.

Nice! . . . what boat is that?

These are available. $1700

Dayuum that's a nice looking business-end of your boat!

OK, but if they are able to increase speed, why are they rarely seen on raceboats?

As Clay said in racing situations maybe because they poduce less drag so they can't use them to drag and lean the boat into high speed turns?

Ben -

I may be interested. Can you tell me all about them. As you know I have some issues with my Pantera, big engine and Konrad drive. i have been dropping port tab to keep the boat upright and stop the roll. Several sources have recommended these to me.

Why did you remove them if I could ask.

Email me at [email protected]

Thanks,

Kirk