Originally Posted by Searider
This is how a hydrofoil works. The foils generate more lift with less drag than the hull surface does. If they didn't there would nt be any hydrofoils!
I agree it's quite magical though
Duncan - yeah I follow how a hydrofoil works and they are indeed magic. Like those aeroplane things that fly through the sky!
However, the benefit of a hydrofoil comes (as I understand it) not from removing the planing surface of a hull from the water, but by removing the non planing surfaces that cause drag.
Cristiananthony was suggesting, "reduce some of the drag from the hull's planing surfaces by producing enough lift to cancel out the weight of the outboard and one driver".
Does a hydrofoil bring any more benefit than simply having more (well designed) planing surface on the hull? Or is the benefit of lifting completely
clear about ride comfort by missing the waves?
However if we are talking about the boat in Cristiananthony's profile - it looks like its simply underpowered (Gemini 550 + Yam 60HP 4/s)? and over-propped (25"). The cynic in me says if you could get 100HP performance from an F60, with the same fuel economy essentially just by modifying the shape of the gearbox then Yamaha would be doing it, patenting it and boasting about it.
If you really want to add a hydrofoil then I'd think the last place you'd want it is in the turbulent water directly under the prop. Hydrofoils have been around for over 50 years and haven't really caught on other than in some specialist applications, that tells you something about their practicality for everyday leisure boating.