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Old 30 August 2004, 14:06   #11
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[QUOTE=timboli] humbers figures suggest around 28-30 knots flat out for a 6.3,which means to cruise economicaly at 4500 rpm you wont be going very quickly.

I am currently getting close on 30knots (GPS) with a 40hp four stroke! Boat is 5m - so I am intrigued as to what 100hp on the back would do - hopefully I can test one at Humber?
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Old 30 August 2004, 14:20   #12
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Quote:
Originally Posted by Cookee
At the other end of the scale racing a 7.3 metre race rib at speeds of up to 72 mph in ideal conditions we generally calculate 1.65 litres per nautical mile with a margin for safety!



S**t! Cookee, if my lardy rig was as economical as that racering thingy of yours, I'd be dead chuffed... Still, if I'd wanted "economical" I'd a' bought a sail boat......
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Old 30 August 2004, 15:48   #13
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I went the diesel route for the fuel consumption, cheap diesel and the reliability.
So far ive put 72 hours on the engine and put in 650 litres of diesel.
So 9 litres per hour.
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Old 31 August 2004, 06:20   #14
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interesting guys, i would have thought more diesel replys.. cookee your boat sounds better than my always drinking inboard even...
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Old 31 August 2004, 14:54   #15
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Yamahas figures

http://www.yamaha-motor.com/products...ighJetPort.htm

As Paul(Jackeen) pointed out,American site so probably quoting US gallons,imperial is about 85% of US gallons.
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Old 31 August 2004, 15:35   #16
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Suzuki Figures

Similarly, Suzuki do figures on their US site too with different boats - one page with the Suzuki 140 is here:-

http://www.suzukimarine.com/sr04/df140/boattests.php

-Alex
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Old 31 August 2004, 15:38   #17
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the Gemini 7.3 I drive sucks up 80 litres an hour with 11 people on board at about 38knots. It has an Optimax 225 I used to think that was quite a lot but it's alot of people on a V heavy boat
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Old 31 August 2004, 19:49   #18
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My son Michael likes to use his Dad's petrol and clocked 84.16 litres per hour.

I might as well throw my wallet over the wall....
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