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Old 27 September 2011, 17:36   #31
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Rob if you were at sea for about 10 hours and used 260 litres (I think that what's you said) that's 26 litres per hour.

Surely that's about right if you were "gunning it as much as you could" with the boat "super heavy loaded".

For reference my 150 Optimax uses 56 litres per hour flat out according to the Smartcraft gauge.
22 litres per hour for 27 knots when the boat is lightly loaded.
Heavily loaded (8 people and weekend kit) it needs to be almost flat out for high 20 something knots.
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Old 28 September 2011, 04:49   #32
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Originally Posted by Searider View Post
Rob if you were at sea for about 10 hours and used 260 litres (I think that what's you said) that's 26 litres per hour.

Surely that's about right if you were "gunning it as much as you could" with the boat "super heavy loaded".

For reference my 150 Optimax uses 56 litres per hour flat out according to the Smartcraft gauge.
22 litres per hour for 27 knots when the boat is lightly loaded.
Heavily loaded (8 people and weekend kit) it needs to be almost flat out for high 20 something knots.
Thanks for the reply, and actually its better than that - on the way out I had 210l and ran out 1mile offshore. Therefore its say 22l per hour.
Where I was really concerned was the return trip, as I used 260l for a 5 hour run and was gutted as thats not great consumption. But 3 weeks later I find there is still 110l in the main tank which to me ran out.
So based on those figures
Trip out - Avergage Speed 8 knots
Fuel Consumed - 210l (would really of been 220 had I not had the coastguard pick me up
Travel time = 10 hours
Total 21l per hour

Return Trip
Average Speed - 25knots (WOT for 2.5hours)
Fuel Consumed - 150l
Travel Time - 5 hours
Total - 30l per hour

Like I say the only spanner in the works was the thought that I had actually used 260l for the return and that would equate to a 52l per hour which is a sting in the pocket.

Searider - your speed andfuel figures are very much the same as mine, if I have 8 people on the boat it takes full throttle to get it up to the high 20 knots. But with a couple of light kids and a can of coke she will fly at 38knots.
Do you ever find when your boat is loaded the sea can sometimes "grip" the boat and your speed will drop and struggle, then suddenly it gets released and will surge back up tp speed
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Old 28 September 2011, 05:22   #33
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#just a thought

How long had the fuel been in there?
Would not run if water contamination
Hence the fill up was so cheap
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Old 28 September 2011, 05:36   #34
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I'd get a fuel flow meter and just see what it's drinking at different rpm and boat loads etc so you know for future use

Jim
I agree - with the Etec having fuel flow / instant fuel consumption and fuel used/remaining, I have a very good feel for what the engine will use at all sorts of speed and sea conditions. I never had much of a clue with the old boat and engine, but I'd not go back to anything without fuel flow information again.
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Old 29 September 2011, 12:33   #35
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Rule of thirds for me....

1/3 to get there,
1/3 to get back
1/3 to play with the weather!!!
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Old 29 September 2011, 13:34   #36
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Rule of thirds for me....

1/3 to get there,
1/3 to get back
1/3 to play with the weather!!!
Presumably for a cross channel type trip you wouldn't carry 3x the amount required to get to a refilling point though?

If the OP had done that he would have about 3/4 of a tonne of highly flammable fuel weighing down his boat and taking up masses of deck space, probably in cans which weren't that secure and are a nightmare for refilling at sea anyway.
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Old 30 September 2011, 09:53   #37
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Quote:
Originally Posted by Rob Jones View Post
Thanks for the reply, and actually its better than that - on the way out I had 210l and ran out 1mile offshore. Therefore its say 22l per hour.
Where I was really concerned was the return trip, as I used 260l for a 5 hour run and was gutted as thats not great consumption. But 3 weeks later I find there is still 110l in the main tank which to me ran out.
So based on those figures
Trip out - Avergage Speed 8 knots
Fuel Consumed - 210l (would really of been 220 had I not had the coastguard pick me up
Travel time = 10 hours
Total 21l per hour

Return Trip
Average Speed - 25knots (WOT for 2.5hours)
Fuel Consumed - 150l
Travel Time - 5 hours
Total - 30l per hour

Like I say the only spanner in the works was the thought that I had actually used 260l for the return and that would equate to a 52l per hour which is a sting in the pocket.

Searider - your speed andfuel figures are very much the same as mine, if I have 8 people on the boat it takes full throttle to get it up to the high 20 knots. But with a couple of light kids and a can of coke she will fly at 38knots.
Do you ever find when your boat is loaded the sea can sometimes "grip" the boat and your speed will drop and struggle, then suddenly it gets released and will surge back up tp speed
Hi Rob,

Not noticed a surging.

This fun does cost some!

Duncan
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