I think that what I am trying to say is to somewhat repeat what is written about the foils at the stealth web site. (http://www.stealthmarine.co.uk/)

They use the foils as neither a lifting nor a sinking device. It is used as a device to keep the bow from either pitching up or down, by keeping it neutral.

By keeping the boat from pitching up or down they claim the boat to be less affected by that constant pitching moment induced drag. Ultimately the only way to determine if it is true is to try their rudders. (or try to make your own)

I have no way to determine if what they clain is accurate.

I suspect that travelling over large rollers as opposed to smaller lake sailing will affect whether this idea has merit... They claim that it's like having a 2 foot longer boat.

Ultimately, if you are about to be "flicked like a bougger" (is that how you spell it?) ain't notting gonna 'elp ye!

The size of your boat relative to the rollers you are sailing in will inevitably be a factor as well as lots of other factors.

Has anyone tried this idea?