Re: [Amel Yacht Owners] Re: Autoprop vs Maxprop and specs of each
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Very interesting information from you and I fully agree with all your comments. I have never had a Maxprop yet but this is the second boat on which we have had the autoprop and really like this prop for all the reasons your theory presents.
On Island Pearl II we have now done 3000 hrs on the Yanmar 75 (I absolutely love this engine too!) and 90% of those hours would have been done at revs between 1400 - 1600 at which we cruise and motor sail often, however we can actually do 9.5kts at 3400 - 3600 revs (tested both ways to ensure no current impact). I am not so sure that this speed would be possible with a fixed prop or the Max Prop or any other brand.
This may sound ridiculous or far fetched, however I can tell you a story of how this top speed saved our lives when a large angry steel Indonesian fishing boat tried to ram and sink us in the dead of the night with just my wife and I on board, with no guns or any means of defense! The nearest yacht to us was 15nm in front, and we were probably over 100nm. from our next safe port. This boat chased us for two hours and appeared to be doing 9.3kts and was gaining on us as the seas were rough, until the wind came up hard enough that our poles out genoa and all sails up took us over 10kts. We ran like hell with all lights, radar, AIS etc off for 5 hours at this speed! In my view the autoprop is an excellent match with the 75HP Yanmar and also provides brilliant fuel consumption extending our motoring range to huge distances compared to larger motors or different props.
SV Island Pearl II, SM#332
Cape Town, South Africa
0411 016 445