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Old 20-08-2008, 23:08   #16
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Originally Posted by DtM View Post
I guess you are working in US gallons.

We use 4.5 to 5 litres per hour cruising at 6 knots or so. With a 200 litre tank (which is the standard Mahe tank) that would give a safe range of 240 miles.

Is this with 2 engines?

And you have alote of space for extra tanks to bring with you.

My question about where you live is good to know so we know in what direction you will go after your delivery.

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Old 20-08-2008, 23:52   #17
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My figures are with both engines running . I was just looking at using the fitted standard tank when I looked at range.

I agree with your comment that there are plenty of places to carry more fuel

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Old 21-08-2008, 00:52   #18
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Originally Posted by VisaView View Post
Fuel consumption on Mahe 36
Hello all,

I failed in earlier post o mention the size of the engines, they are the 20HP Volvo's

I was hoping to get actual numbers on a cruising range at @ 6 knots aboard the Mahe 36
I will be taking delivery This Sept. 24 in La Rochelle and need to know how far she'll go on 53 gallons of diesel.
First of all, if you still have the chance, go for the 30 HP instead of standard 20 HP's.
I own Orana with 2X40HP Volvo sail drives, standard props. Never used 2 engines at the same time, unless I am heading to very strong winds, high waves or strong current. One engine at 2100-2200 RPM easily gives me 6+ knots.

Volvo web side gives a conpsumption of 0,5 gallon per hour at 2.300 RPM for yr engine. (assuming that is a new generation D1-20 serie engine). That should give you 6 knots w/out problem. (If not then in my view 20 HP's are too small for the boat)
If you get 6 knots with this consumption, you should get a range of app. 600 nm.)
Remember, this is for perfectly calm water, no wind. If you can sail motor the range would get longer. Ia you head heavy seas/winds, that's another story; two engines at around 2.000 RPM would be necessary. Then total consumption of 0,8-0,9 gal per hour is likely and you should average beetween 5 and 5,5 knots.



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Old 21-08-2008, 03:48   #19
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I base all my calculations on 1GPH for both engines @ 2300 RPM.speed around 6Knts .
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Old 21-08-2008, 06:20   #20
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I would think the Mahe 36 would go through the water at least as easily as my old Prout 38'. I have 2 Volvo 28 hp and cruising at 2200 to 2300 RPM I run a little over 6 knots (~6.3) and burn under 1 1/2 gph total running both engines. These engines are old and tired.

All this assumes a clean bottom.


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