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Post by Spritz on Aug 2, 2015 21:54:26 GMT
Dear all how much is the consumption of your YANMAR 54 HP engine? it seems that mine in 13 Hours drunk about 125 liters of Diesel! how much is your consumption rate at 2.500 rpm? thank you
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Post by so36idavid on Aug 3, 2015 2:32:08 GMT
Spritz, According to the specs, at 2500 RPM you should be burning 7 lts/hour. So in 13 hours you should have burned about 90 lts. The specs are usually a bit off, but not 40%. So obviously something isn't right. Most likely you didn't accurately read your RPM or your tach is off and you were actually running closer to 2700 RPM.
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Post by Tafika II on Aug 4, 2015 18:47:36 GMT
We have the same engine and at 2300, we burn about 4L/hour or >1 gallon/hour cruising around 6.5Kts. At 2700 we are around 7L/hour or 1.8 gallons/hour with headwinds (or we would be sailing) and 1-2M seas cruising around 8.5kts.
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Post by zofiasailing on Aug 12, 2015 23:45:11 GMT
Spritz We also have a 42 DS with the Yanmar 54hp motor (and only a 126l diesel tank). We generally motor at 6.5 -7knots at 2000rpm and use just over 2l diesel/hr. We would only go to 2,500 for very short periods eg. emergency or crossing a bar. There is a curve somewhere that illustrates that between 2,500- 2,700 rpm the increase in boat speed is minimal. We feel that there is a sweet spot where speed and fuel consumption are acceptable. Sure, we could 'fang it' and get 8knots but we'd only do that for short bursts. We are also aware that diesel motor need to be 'worked'. If you've got 550nm ahead of you, you want to know that you'll reach your destination with fuel to spare! Btw we carry 4x20l diesel jugs (ie. 80l) extra to give us extra scope. The Australian coastline is long and sometimes remote.
Based on our experience, your engine didn't just 'drink' your tank dry, it guzzled it!
Hope this helps.
SV Zofia
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Post by Spritz on Aug 13, 2015 10:50:38 GMT
Dear all, my engine is with the sail drive SD 50 at 2500 rpm I run over 8 knots (almost 8.5) and this is fine for me. I checked and the mean consumption over 54 hours is 5.2 lt/h, obviously in sever sea condition the consumption goes up to 7 lts/h.
now I have a spare 20 lts on board but as you know is not comfortable to spill fuel in the tank with severe conditions, does anyone has a spare tank attached to the main one?
Thank you
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Post by alex1949 on Aug 13, 2015 20:07:50 GMT
Dear all, my engine is with the sail drive SD 50 at 2500 rpm I run over 8 knots (almost 8.5) and this is fine for me. I checked and the mean consumption over 54 hours is 5.2 lt/h, obviously in sever sea condition the consumption goes up to 7 lts/h. now I have a spare 20 lts on board but as you know is not comfortable to spill fuel in the tank with severe conditions, does anyone has a spare tank attached to the main one? Thank you
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Post by zofiasailing on Aug 13, 2015 22:17:19 GMT
Alex1949 Have you thought of a siphoning hand pump for your fuel top-up when under way? Not expensive and can be bought at an Auto shop. Less spillage and safer than trying to balance with a heavy canister occupying your hands. If we were going to the expense of an additional tank we'd probably want it to hold quite a bit more that 20l. Obviously we prefer to sail all we can. The tankage on our boat is 'light on' at only 126l. We originally thought it was170l but we found the capacity stamp on the tank and it was a disappointing 126l. SV Zofia
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Post by ianpowolny on Aug 14, 2015 6:57:07 GMT
Alex1949 Have you thought of a siphoning hand pump for your fuel top-up when under way? Not expensive and can be bought at an Auto shop. Less spillage and safer than trying to balance with a heavy canister occupying your hands. If we were going to the expense of an additional tank we'd probably want it to hold quite a bit more that 20l. Obviously we prefer to sail all we can. The tankage on our boat is 'light on' at only 126l. We originally thought it was170l but we found the capacity stamp on the tank and it was a disappointing 126l. SV Zofia Old thread: jeanneau.proboards.com/thread/3927/easy-use-siphon-tube
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Post by Trevor on Aug 25, 2016 1:43:23 GMT
Sorry to dredge up an old thread but I just completed an experiment that may provide some assistance to others who are wondering about the long range motoring capability of their yacht.
We recently undertook a trip from Coff's Harbour to the Gold Coast seaway on the east coast of Australia. Pretty flat seas, not much wind but we wanted to get to destination irrespective of if we could sail or motor there.
The journey took 30 hours, and the distance by the paddle wheel log was 200Nm exactly. The actual distance is 152Nm so we had quite a lot of opposing current (east current as in "Finding Nemo") and I am probably not the best at travelling in a straight line. I was concerned about fuel consumption and know my fuel gauge is very unreliable, showing reasonably full when not much fuel left.
We motor sailed for the first two hours, sailed for one hour and then motor sailed for the entire remaining 27 hours. I kept the revs down to between 1300 and 1800 and when I could, used the sails to provide some lift when the wind allowed. Without wind I tried to maintain between about 5 knots and 6 knots. Throughout the journey, very little wind was favourable for us and was used for some assistance for about 10 hours of the trip.
I arrived at the destination and immediately refuelled. After 29 hours of motoring and just travelling at a gentle constant pace, we filled the tank with 64 litres of fuel.
I was absolutely amazed that we could travel for so long on about half a tank. I am sure that if I had hammered along at a much faster rate we would have used much more fuel but I am very happy with that fuel consumption experiment. We averaged 2.2 litres per hour.
Regards,
Trevor
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