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8HP on Scott Hudson Bay Freighter

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  • 8HP on Scott Hudson Bay Freighter

    Preparing for our summer excursion, three of us took our Hudson Bay Freighters to Quartz Lake for a shakedown cruise.

    As expected, all three HBs, with a very moderate load of 600 pounds, ran at 17-18 mph with 20HP and 10" pitch props.

    Then came the surprise as we put a short shaft 8HP on a high transom HB. That's a 15" motor on a 20" transom. With the same load, this 8HP produced 11.5 mph.
    There was no cavitation at WOT until I turned hard. Definitely a combination I could use in a pinch.

    This 8HP Yamaha is a beauty that I bought from KK this spring. Thanks KK!

  • #2
    Wonder if you could induce cavitation on that combo heading up river with the increased hull speed?
    Fighting gravity is never cheap.

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    • #3
      I can't see where there would be any difference unless you were in extremely turbulent water.

      The speeds attained with the 8HP vs the 20HP does indicate [to me anyway] that we often try to over power our canoes.
      My 20HP is seldom WOT. I usually run about 2/3 throttle for fuel efficiency at 13-14MPH.

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      • #4
        Originally posted by VernAK View Post
        The speeds attained with the 8HP vs the 20HP does indicate [to me anyway] that we often try to over power our canoes.
        I think that's true concerning all boats. HP seems to be chosen more often based on an emotional decision rather than empirical evidence/logic.
        ...he who knows nothing is nearer to truth than he whose mind is filled with falsehoods & errors. ~Thomas Jefferson
        I would rather have a mind opened by wonder than one closed by belief. ~Gerry Spence
        The last thing Alaska needs is another bigot. ~member Catch It

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        • #5
          Vern glad it went to a good home, about 12 MPH is what I saw mine was lo transom HB. It might cavitate if you have a big load to far forward? The stern water is higher on the semi-displacement boat. Ran your 8 HP with a lift and you could raise it way up without cavitation and hard to get a prop strike that way. Kurt

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          • #6
            I know this is sort of reviving an old thread, but it seems relevant and worthwhile for folks to know. I had a river trip last week where I used my 8hp yamaha 2 stroke on my Scott Hudson Bay, which I carry as a spare motor on long trips... I went 75 miles downstream on one river, 7 upstream on another, passenger and gear weight of 700-750 lbs, I topped off my fuel tank (6.6 gal) at the beginning, and I will have to measure what's left, but I barely burned half of the tank. It actually appears to be over half full yet. I will measure the remaining fuel and report back. I wasnt in a hurry and just let it travel at a comfortable speed. These hulls are amazing.

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            • #7
              Short transom or long transom?
              Fighting gravity is never cheap.

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              • #8

                I would have to take some measurements to be sure. But I believe it is a short transom, someone modified to the height of a high one, then a "ja#$@$$ lift" is bolted on, so my motor sits approx 18" behind the transom. A large horizontal "wing" is mounted below the waterline to combat "squat" under power. Its ordinarily powered by a honda 20. I prefer the 8horse for its weight, but the 20hp works better going upstream pushing a load....

                However the 20hp with its extra weight likes to bounce down hard in sketchy water, making me lean toward a surface drive upgrade after dealing with a couple broken lower units. It doesnt take many of those to pay for a different setup!

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                • #9
                  Originally posted by Wyotrap View Post
                  I know this is sort of reviving an old thread, but it seems relevant and worthwhile for folks to know. I had a river trip last week where I used my 8hp yamaha 2 stroke on my Scott Hudson Bay, which I carry as a spare motor on long trips... I went 75 miles downstream on one river, 7 upstream on another, passenger and gear weight of 700-750 lbs, I topped off my fuel tank (6.6 gal) at the beginning, and I will have to measure what's left, but I barely burned half of the tank. It actually appears to be over half full yet. I will measure the remaining fuel and report back. I wasnt in a hurry and just let it travel at a comfortable speed. These hulls are amazing.
                  Indeed!.........once we get accustomed to the canoes fuel economy it's difficult to go back to large hp boats.

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                  • #10
                    If memory serves correctly, I did check the fuel tank and it had around 2.5 gallons left in it-which I then used in the chainsaw this winter....

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