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Over the last 36 hours I've been watching a series of video clips about the Race to Alaska known in shorthand as R2AK. It's an insane 700 mile race up the Inland waterways from Washington state to Alaska. Contestants on stand up paddle boards FFS. A 25 foot home built open cutter crewed by people who have never sailed. All out race teams. An old guy in a racing dinghy who takes over 22 days to complete, single handed. The only rule - no motor allowed on the craft. Funny inspiring scary and crazy in about equal measure.

So either you did not read that paper, or you do not understand it (sorry I don't intend that to come across harshly). If you read it again, and you will see that it is exactly as I stated above and will go over again here. You will also see that this is not about an product fitted to a Hull somewhere and how well it works. This was nothing more than a lab test carried out by some Uni guys. Also they were using a range of frequencies and a very small test area. Basically no more than the surface of the transducer. I would expect that surface of the transducer.likely coupled to a plate, woul

You obviously don't watch the Infomercials on TV in the late night and early mornings then. Wow there are some wild claims in those shows. I have a major background in Sound, mostly audible sound, but also Ultra Sound. When this idea first hit the market, I had mentioned my concerns here on Crew and we had a big discuss about it. Fullers Ferries tried large units on the Ferrys a few years back now. They failed to do anything measurable in keeping the Hulls clean and they had them removed. We discussed the subject again then. The idea of using Ultra sound was first developed for lar