Message Board
Message 8 of 8
Posted by member Roger Beese on Wednesday 8 September 2010
Hi I am just fitting Honda 75A to my Family Pilot 20
What are the latest fuel consumptions known and what are the typical prop dia and pitch
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Message 7 of 8
Posted by member John Cook on Tuesday 7 September 2010
As a new owner having a Honda 75 4/S on my Bosun 20, used on Solent passages, the replies have been very helpful. Hitherto I was thinking that my contributions were keeping the Treasury and the fuel companies in business. Honda Technical Dept advised they me they never supply typical fuel consumption data.
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Message 6 of 8
Posted by member Damian on Monday 6 September 2010
Hello Kevin,
I had a 40hp Mercury four stroke on the back of my River Pilot 20. My average fuel consumption at displacement speed was approx. 2.5 to 3 litres per hour @ 6 knots. Bear in mind this engine would never make the boat plane and it is a heavier boat than a Navigator. I made a journey of 42 nautical miles along the tidal Co. Down coastline which took 6 hours and 27 litres petrol. This journey included going with and against tidal streams.
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Message 5 of 8
Posted by member Kevin Hart on Monday 6 September 2010
Thank you, too, to the other kind members for their comments.
Kevin
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Message 4 of 8
Posted by member Graham Green on Sunday 5 September 2010
The thing to remember especially on rivers is the wake that you will leave when you push an 18'hull at 6 knots with a 50hp!
I have found that that my 20footer with a four stroke 60hp Yamaha will cruise allday on flat water at 1700rpm giving me approx 5knots on minimal amounts of fuel and wake - push it up to 7 knots and I will burn a couple of gallons a day, and no cup of tea or kettle will remain static on other boaters craft or moored vessels - take her over the "hump" and on to the plane and with speeds over 10/12 knots and acceptable? estuary wake you can virtually watch the fuel gauge needle drop and I can easily burn in excess of four galls in a day although a reasonable distance will have been covered. The 50hp will give you economy at low speed combined with reliability and possibly the most important aspect LOW NOISE!!!
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Message 3 of 8
Posted by member Robert on Sunday 5 September 2010
Hello Kevin
I have a Navigator with a 50HP Mariner Big Foot engine. I have not been able to do precise caclulations on the MPG etc but I have a general idea. I was more interested that the auxillary engine would work while going from the Tower bridge to Wandsworth bridge(or the other direction), which it did, rather than the MPG. All I do know is that the MPG on the non tidal part of the Thames was the same as my previous engine on my previous boat which had a 9.9HP Mariner Big Foot engine on it. Regarding the Tidal Thames, if you are in a group you my be a on a 1/4 trottle due to the fact you are with the tide group. There maybe times when you have to open up the throttle and use more petrol but if you are on a budget, you can do this cheap. It is only when you open the throttle that you use fuel.
Hope this helps.
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Message 2 of 8
Posted by member Kevin Hart on Sunday 5 September 2010
Thank you very much Graham. You reply is most useful and I am relieved to know that at low revs/speed the fuel consumption is fairly low. With the cost of fuel and the quantity you are able to stow comfortably on board these are important considerations.
Thanks again, Kevin
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Message 1 of 8
Posted by member Kevin Hart on Saturday 4 September 2010
Hello,
I am considering purchasing a Hardy Navigator 18 with a Mariner 50hp 4-stroke engine. I will be using the boat for river and estuary trips.
I am anxious to know more about fuel consumption. I wonder if any members have any information on how much fuel per hour would be used in rivers or canals where the speed is restricted to around 6 knots? Also how much would be used at maximum speed in open water? Finally whether you consider that a 50hp outboard is too large for river use?
Many thanks, Kevin
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