Re: [Amel Yacht Owners] Speed vs. RPM
Krassopoulos Dimitris <dkra@...>
I agree that the Autoprop is sensitive to marine growth but any propeller is
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I think. Regarding SEAJet product I tried it without any good result. So I do not recommend it. My question to John : what was the speed difference with the autoprop and the fixed propeller? SM 2000 Alma Libre Dimitris
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From: amelyachtowners@yahoogroups.com [mailto:amelyachtowners@yahoogroups.com] On Behalf Of John McDougall Sent: Monday, March 13, 2006 2:12 PM To: amelyachtowners@yahoogroups.com Subject: Re: [Amel Yacht Owners] Speed vs. RPM Hi Claude & others My SM2000 no 330 had the Yanmar/Autoprop combination and max revs would frequently drop to about 1700. This was always cured by cleaning the prop. My berth is in Antibes and the rate of marine growth seems very high there for a reason we needn't go into but let's say the harbour fish are large and fat. Quite expensive as I don't dive (and certainly wouldn't in the marina!). The prop was subject to a recall by Bruntons and in May 2004 I had Amel fit the spare fixed blade prop. This prop is still fitted. It is difficult to compare the performance of the fixed prop against the Autoprop but I would say the difference is so slight as to be unoticeable without making a test under identical conditions. I agree that the Autoprop is extremely sensitive to fouling and I have specified a fixed blade prop on my "54" to be delivered at the end of this month. Finally, before the fixed prop was fitted I had it treated with PROPSPEED a silcone based propellor antifouling which works by means of producing a slippery surface that marine gowth cannot adhere to. The result was fantastic - the prop was still clean a year later as opposed needing to be cleaned every couple of months in summer. Propspeed is very expensive but I believe Seajet Pellerclean to be a similar product and this has just been rated as the best in March Yachting Monthly and Motor Boat magazines. Has anyone tried it? John McDougall -- In amelyachtowners@yahoogroups.com, Claude Roessiger <nearlynothing@...> wrote:
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