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5222Re: [campernicholson] Speed under motoring (4.7 knots at 2.000 rpm)

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  • Peter Jørgensen
    Jul 30, 2010
      About the speed on your Nic, we had just returned from our holiday and the last 2,5 hours we were going by motor.
      This vinter we had installed a new Yanmar 3JH4 with a SD50 saildrive. At exactly 4,7 knots, the engine runs 1100 rpm. The only thing is that the mechanical log was stopped so I dont know what way the stream went but, this is now fixed and I will gladly write down the exact figures next time we sail out.
      I have to tell you that I had put on a Brunton Autoprop and this is the absolut best thing i´ve bought..... full pitch at rewers and the best, no sidewalk at all. Before we had a Watermota Seapanther with a Hurth V drive, and back then you could talk about sidewalk and poor steering in the tight marinas.
      When we runs 6 knots the engine runs around 1400 rpm.
      CN 187 / Addiena      

      From: JFR <jfregnard@...>
      To: campernicholson@yahoogroups.com
      Sent: Sat, July 3, 2010 2:53:19 PM
      Subject: [campernicholson] Speed under motoring (4.7 knots at 2.000 rpm)


      My CN has a 35hp Piranha engine with a two-blade folding propeller. With revs at 2.000 rpm, she sails at 4.7 knots in a flat sea and virtually no-wind. Such a speed seems quite slow to me. Would anyone have figures that I can use as a benchmark ? Should I put in a 3-blade regular propeller ?
      Any advice will be welcome,

      JF Regnard

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