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Nauticat 33 (1981) diesel consumption

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    Ilkiva is now back to Cherbourg, after a 10 days cruise from south Brittanny.

    The wind (3 – 4) turned with us all the time so we were all the time upwind, with a “slight to moderate” sea. Means using the engine very often.

    The engine ran at 1650 rpm, my speed on the water was around 6kts. As my gauges are not accurate at all, I made an estimate of 5 liters/hour. When I refilled the tanks after a few days of navigation, it looked liked the consumption was even less than that.

    Has any fellow member more precise figures of diesel consumption in the same conditions (boat type, rpm’s, speed)

    Thank you in advance,


    Joël Rogale


    Hello Joël,

    Glad to see you too are puzled by your engine (Ford 2712 I remember) consumtion.
    I came to a comparable situation, running at 1600 rmp gives less than 6 liter per hour, at around 6 knots, under normal circumstances.

    I usually warm up the engine for 15 minutes and upon arrival I let the engine run for another 5 or 10 minutes. Even though the clutch is engaged at 1000 rpm I expect 1 liter per hour during this warm-up and warm-down period.
    When I deduct those “warming” minutes and mere liters for figures on the hourmeter and the fuel pump I find – over an entire season – actual effective miles to “cost” slightly higher, namely some 5,6 to 5,8 liter per effective hour, or 0,8 to 0,9 liter to the nautical mile.

    I took the opportunity of careful refillings to correlate the tank level needle with actual gasoil capacity. I have included a picture that helps me. 1/16 of the capacity being some 16 liters or 2 to 2,5 hours. This is correct enough for me and the paralax


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