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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
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      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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