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My old Hobie (pictured here in 1975) would make this very erie singing sound when the boat was on a certain tack at a certain speed. The hulls would resonate. On one occasion, it attracted dolphins who came up alongside the boat, they swam directly under me while I was hiking out. Very cool. That was well over 30 years ago. Do the newer Hobies still make this sound? Has anyone else experienced this phenomenon?
Posted : June 26, 2011 2:45 pm
What you remember is "rudder hum" caused by cavitation of the rudder trailing edge. Racers eliminate the noise by filing the trailing edge sharp, others just think it's cool.
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Damon Linkous
Posted : June 26, 2011 6:03 pm
fixing ventilation, aka 'rudder hum'
Posted : June 27, 2011 1:05 am
I like thoes sails on your '75 Hobie.
Gray
77' Nacra 5.2
Posted : June 27, 2011 5:36 am