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foil hum


berny

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Ok, does anyone know why my foils hum? One rudder and one d/board get a real sing song going as soon as the boat reaches a certain speed. It can't be fast and I'd like to eliminate it because it's annoying but I'm at loose end having checked the alignment and I've also tried fairing but no result. I have a suspicion it might be that the gelcoat isn't bonded to the glass laminate in some places. That's about all I can think of as being the culprit.

Any other ideas?

Bern

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My foils are taken from moulds that I had built from plugs I made. They are vac. bagged carbon/foam laminates, very straight and very strong. The sections are NACA sections and are 'squared off' at the trailing edge as the NACA designs dictate. To shape them to a point would be a counter productive and unnecessary because one rudder and one d/board are noiseless so it's not the square trailing edge causing the problem. They are also finish blocked with 1200 wet&dry so their surfaces are fair and smooth.

Bern

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