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Old 12 February 2010, 04:15   #1
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How green is your engine ?

So what size engine on what size boat do you have ?

fuel consumption and top speed in knots.?



I have 2 x 50 hp 3 cylinder bf 50 Hondas on a 5.6 mtr 30 knots top speed using approx 10 gallons an hour .
I say approx depends on sea conditions. 2 persons on board..
The pair have done 300 plus hours.in 12 years.
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Old 12 February 2010, 04:16   #2
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Im not sure about fuel consumption.

But 5.20M Valiant 70HP 4 Stroke Suzuki

33 knots
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Old 12 February 2010, 04:38   #3
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Make: Humber/Delta Seasafe
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Engine: Merc 60 Clamshell
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Green? Mine's painted black!

No idea on fuel consumption due to itr self destructing, but there have been at least 2 previous threads already on this subject - have a sech for them.....
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Old 12 February 2010, 04:44   #4
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Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
MMSI: "Mmmmm SI" she said!
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Sonar

Hi.

I’m afraid ‘Green’ and ‘The Nashers Revenge’ are a bit mutually exclusive.

In fact I’d suggest that the only ‘Green’ RIB is one made from renewable forest wood, rubber impregnated cotton tubes and a Bloody great area of sailcloth instead of an engine.

However since you ask.

6.5M Ocean
Suzuki DT200EFI, which is a two-stroke so burns oil as well.
Cruising at @25knots uses @1.25 l/mile
Flat out at @45knots uses @3.5 l/mile

However both the boat and engine were re-cycled by me, which is a damn sight better for the environment than building a new one.

Nasher.
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Old 12 February 2010, 04:52   #5
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1 200HP - optimax 2 stroke - V6. 52knts flat out on a flat sea - on a 7.5m .

Using about 80lph at this speed.

As for Green - not a chance !

small boat 1 50hp 4stroke - 31 knts flat out on a flat sea - on a 4m .

Using about 15lph at this speed !

Much Greener !
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Old 12 February 2010, 04:53   #6
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Quote:
Originally Posted by 9D280 View Post
Green? Mine's painted black!

No idea on fuel consumption due to itr self destructing, but there have been at least 2 previous threads already on this subject - have a search for them.....


New members may have an interest in the topic.

And as you say has been asked before.
And I guess so have many many other topics and will continue to be re asked over the years to come.
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Old 12 February 2010, 05:34   #7
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Before my 60hp two stroke stopped working I got through 12 litres in half an hour, that was on and off the throttle.
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Old 12 February 2010, 08:13   #8
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Boat weight makes a big difference

For planing boats, the all-up weight is probably the most important factor. Length, hull shape, prop and engine efficiency all play a part of course. Power: weight ratio is the main thing that affects speed, so for two similar boats using the same power, the lighter one will go faster or use less fuel. If people can have a stab at the all-up weight of their boat when they post on this thread, the answers will be more useful, e.g. my hull should be ..., carrying 100 litres of fuel, 4 people and one small dog, or whatever.

We have a graph of power versus speed for various all-up weights on our website: http://www.eco-marine.co.uk/xr-range.html The figures are from a well known text book and apply to boats in general, not just RIBs. Fuel consumption is more-or-less proportional to power, so where the graph shows a heavy boat needs twice as much power as a light one for the same speed, it will use twice as much fuel.
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Old 12 February 2010, 08:45   #9
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Quote:
Originally Posted by Sonar View Post
New members may have an interest in the topic.

And as you say has been asked before.
And I guess so have many many other topics and will continue to be re asked over the years to come.
OK, so I didn't have time to search the threads out earlier, but for starters:

http://rib.net/forum/showthread.php?t=33803
http://rib.net/forum/showthread.php?t=33598
http://rib.net/forum/showthread.php?t=31168
http://rib.net/forum/showthread.php?t=20150
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Old 12 February 2010, 09:10   #10
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Many thanks I will start going through them all.
Again many thanks for the information.

Respectfully
Robert
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