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Old 22 May 2014, 15:59   #1
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Shoreham to Dieppe for Pizza

Cracking weather last weekend so myself and a friend decided to make the hop across the channel from Shoreham to Dieppe.

Some short facts:-
Distance Travelled - 72nm each way
Boat - Humber Ocean Pro 6.3m
Engine - 150HP Honda
Fuel Consumed - 200l
Sea State - flat like a lake

Video

Dieppe Dash - YouTube
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Old 22 May 2014, 16:27   #2
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Hey dude, great vid Did you ever nail down the fuel problem on your Alderney trip?
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Old 22 May 2014, 16:39   #3
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Alderney

hey, I think the Alderney trip was a couple of factors and learnings. Basically I now know you either have speed or time as limiting factors (Distance doesn't play into it)
Alderney was quite a rough crossing and therefore speed had dropped to 8 knots which then created a time problem, the reverse is also true, gun the engine to get there quicker and you also chew through your fuel.
The other confusing part with Alderney return was the switch between main tank and aux, it would seem if its not dead closed the engine has enough suck that it can draw down on external tanks (in fact if you do not open the breathers it will actually collapse the tank with the vacuum created)
I have now done quite a few trips and best consumption is 1nm per litre and average is .68nm per l.
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Old 22 May 2014, 16:40   #4
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Cool vid Rob nice to see Orca again looked a great crossing


Sent from my iPhone using RIB Net
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Old 22 May 2014, 16:55   #5
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Quote:
Originally Posted by Rob Jones View Post
Cracking weather last weekend so myself and a friend decided to make the hop across the channel from Shoreham to Dieppe.

Some short facts:-
Distance Travelled - 72nm each way
Boat - Humber Ocean Pro 6.3m
Engine - 150HP Honda
Fuel Consumed - 200l
Sea State - flat like a lake

Video

Dieppe Dash - YouTube
Hi, thanks for your figures and video, very interesting.
Out of interest how long did the journeys (there & back)take and what speed did you cruise at?
Cheers
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Old 22 May 2014, 17:35   #6
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Quote:
Originally Posted by Rob Jones View Post
Cracking weather last weekend so myself and a friend decided to make the hop across the channel from Shoreham to Dieppe.

Some short facts:-
Distance Travelled - 72nm each way
Boat - Humber Ocean Pro 6.3m
Engine - 150HP Honda
Fuel Consumed - 200l
Sea State - flat like a lake

Video

Dieppe Dash - YouTube
Hi Rob.
Weather looked fab you lucky things!
Just wondering what sort of speed/RPM you were averaging to return these figures? I take it is a 4 stroke?
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Old 22 May 2014, 18:00   #7
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The sea state was really good………I mean really good, it was like running on glass so much so that the boat didn't bob up and down it just sat flat so made for a really smooth ride.
The boat I was with (Cobra One) is a new purchase for my friend and a 200hp 2stroke, he wasn't sure of his consumption so we kept things quite tame.
26knots seemed to be the best speed and we pretty much kept at that, revs at that speed sit around 4000.
I used my spare tanks first which showed me with certainty that I could get 20miles per 25l tank.
Crossing took about 3.5hrs each way and we actually set off from Dieppe at 2300hrs local time so a pure side by side night crossing, felt like something out of a Navy Seals recruitment film.
The sky in the middle of the English channel on a clear night is something worth stopping to look at and it truly was like a blanket of stars.
We also came across a cruise liner the size of the QEII all lit up like an Xmas tree, quite surreal running alongside it and to the stern watching people milling about and your far below in the darkness.
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Old 22 May 2014, 18:52   #8
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Sounds amazing! There's not many days with weather as good as that each year. I planed to go out on the boat last Sunday, but the the misses was playing up

I dred to think how much the 200hp 2 stroke burnt!
Is your Honda the fuel injected or Carb version?
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Old 23 May 2014, 02:35   #9
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Quote:
Originally Posted by Rob Jones View Post
I have now done quite a few trips and best consumption is 1nm per litre and average is .68nm per l.
That sounds a tad high to me, I'd have thought you'd be able to average 1nm/l in normal conditions. I get better than that with twin 115s. Is yours a carbed Honda or DI?

Cracking vid BTW, days like that, make your heart sing
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Old 26 May 2014, 15:19   #10
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I get on average 1ltr per nm with a 250hp on a 8m rib. Having said that, its usually only two of us, but when we go for long voyages, we tend to stay for a week, so the rib is usually full of dry bags etc.

I would've thought with a smaller engine (150hp) the ltr/nm should be a bit better, but again I can see it's not as straight forward. Not sure with a longer rib, the drag is less (once on the plane) and weight is better distributed or not.

Anyway, great video. Just out of curiosity, did you stay there overnight or straight there and back?
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