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Old 28 July 2016, 14:07   #11
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No, it is way better than op
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Old 28 July 2016, 14:17   #12
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No, it is way better than op
Well yes, the Queen Mary got better mileage than the OP
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Old 28 July 2016, 14:24   #13
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Well yes, the Queen Mary got better mileage than the OP

Glad I'm not filling the boat my lads on 2 hrs to put 14,000 L in and it can burn a 1,000 L per hour 😳😳
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Old 29 July 2016, 03:41   #14
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[QUOTE=dubrus;724485]if it helps my old mariner 4 stroke 100hp on 5.6m rib got 0.7lpnm

Dont you mean 0.7nm per lt ?
Gerry.
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Old 29 July 2016, 03:46   #15
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No I do not, sipped fuel my old boat.

The above was 20knots which is where it seemed happy but upto 25knots it was still under 1lpnm.

I use statute now as I just say worst case 1 litre per mile with the ribcraft and when looking on google maps for trips it is just easier.
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Old 29 July 2016, 04:10   #16
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fuel consumption

Well dragging our tubes, 3up and carrying 200litres in a Humber 6.3m with 175hp Opti, in roughish sea over 85miles we are at about 1.4L pm.

2up and 100litres in calm sea, cruising speed, probably just over 1L pm
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Old 29 July 2016, 13:09   #17
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such a great site!
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Old 29 July 2016, 17:15   #18
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The economy on the jet OB is terrible why are you running a jet? When was the pump last serviced? Could be pump is partly to blame.
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Old 30 July 2016, 13:51   #19
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Terrible fuel consumption

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Originally Posted by HDAV View Post
The economy on the jet OB is terrible why are you running a jet? When was the pump last serviced? Could be pump is partly to blame.
I agree, which was the motivation for the post in the first place. The rib came with the jet outboard, I wouldn't have otherwise bought a jet. Certainly not now after having used one for a few hours. I did have the engine inspected and serviced. The impeller that is responsible for pulling the water was in good shape apparently so I'm not sure that this particular engine would be capable of better performance. I am thinking of replacing the leg with a prop leg. That will improve the fuel consumption somewhat I would think and certainly it would help with handling when docking. A new engine would be my first choice but that expense might need to wait a year or so.
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Old 30 July 2016, 16:39   #20
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Depending on the cost of a prop leg could be a good option.

If it's all been checked out then that's the probably as good as it will get...... Apart from the fuel burn does the motor move the boat well?
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