Anti fouling could be easy. All we have to do is get the Cajuns here in Louisiana to develop a good recipe for barnacles. It will probably start with a roux and use a lot of spices. Once the recipe becomes popular, there won't be a barnacle to be found!
Dennis C. Touché 35-1 #83 Mandeville, LA Sent from my iPhone On Jul 9, 2013, at 8:38 AM, phil strong <[email protected]> wrote: > > On 2013-07-09, at 7:00 AM, [email protected] wrote: >> Date: Mon, 8 Jul 2013 20:52:45 -0400 >> From: Bob Moriarty <[email protected]> >> To: [email protected] >> Subject: Stus-List Anti-Barnacle Waves - Was: Music in cockpit >> Message-ID: >> <CAM7ccY+Vhh9S8PUENZhB=k60ttpqmpdktzux1wrrbktpdq0...@mail.gmail.com> >> Content-Type: text/plain; charset="iso-8859-1" >> >> Professor Dreuge & Any Audio Engineers, >> >> Some of the abstracts in your link mention 23 kHz as a sort of sweet spot >> for barnacle repulsion. The spec sheets on the sound exciters all specify >> an audio range with the upper limit at 20 kHz - which is the upper limit of >> audio perception by humans. >> >> I'm an audio newb with a tin ear. Is it likely the sound exciters - or most >> any speaker for that matter - could produce output at 23 kHz? Would it be >> simple to create a CD with a 23 kHz sound track that could be played >> through a boat's sound system (to sound exciters attached to the inside of >> the hull)? >> >> I have more dumb questions for later. >> >> Bob M >> Ox 33-1 >> Jax, FL > > Hi Bob, > I don't know how scientific or specific barnacle-repellant audio frequencies > are… but quite apart from sourcing other audio components (amp, speakers) > having fidelity beyond the typical human hearing range, it is impossible to > imprint a CD with a 23kHz signal. The definition/resolution of CD audio > decreases towards the high end and tops out at 22.05 kHz at which point a > pure sine wave at that frequency would be recorded/reproduced as a > two-data-point wave - a square wave ("Over-sampling" would smooth this out > somewhat but would not produce a higher tone). On the other hand… I'm sure if > the barnacles are sensitive to these frequencies a square wave would piss > them off more than a pure tone. > > or there is something like this: > http://www.americanpiezo.com/standard-products/ultrasonic-cleaning-transducers.html > > Or turn-key system for $1400! > http://www.ultrasonic-antifouling.com/ > > Phil Strong > C&C 24 Aeolus (no stereo, no ultrasonics, just a melodica) > Little Current, Ontario > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected] _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]
