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Old 15 August 2018, 15:14   #1
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replacement for my stolen rib

have seen a humber 6.3 with a 115 hp engine. 6k. previosly a rescue boat.
i hae the chance to replace my stolen beaver 2 (see previous messgae)
i wondered if the engine is underpowered for a boat this size
any info is much appreciated.
james.
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Old 15 August 2018, 15:19   #2
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Depends what you plan to use it for, and which Humber it is, but most people on here would be unimpressed with that combo.
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Old 15 August 2018, 15:22   #3
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humber

just for me. crusing the east and south coast. nosing around the next corner
why is it not a good combo
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Old 15 August 2018, 15:27   #4
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Quote:
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i wondered if the engine is underpowered for a boat this size.
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... but most people on here would be unimpressed with that combo.
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Originally Posted by crui05 View Post
why is it not a good combo
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Old 15 August 2018, 16:04   #5
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replacement for my stolen rib

Id imagine itd get up on the plane and cruise around with just you. If you had 3 passengers itd really struggle to get up on the plane, if it did itd take a long time.

We have a 2.5L V6 2S Merc on a 6.3 Humber. The 115 is a 1.7L 4cyl 2S. It just wont push the boat about v quickly, or get going v well.

IMHO its underpowered, but take it for a spin and see for yourself!!
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Old 15 August 2018, 18:16   #6
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replacement for my stolen rib

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Id imagine itd get up on the plane and cruise around with just you. If you had 3 passengers itd really struggle to get up on the plane, if it did itd take a long time.
You are probably being unnecessarily pessimistic. Humber website suggests the 6.3 is probably the narrow beam OP. As a rescue boat it will at times have had to carry a reasonable load and probably tow a handful of dinghies. It will be (should be) propped accordingly. So it wont be blisteringly fast, and if you are used to acceleration that knocks you into the back of your seat you may well be frustrated but it should plane even with four average adults on board. Id guess top speed moderately loaded would be mid to high 20s. Only the OP will know how that suits him. Whilst some of it is purely down to the need for speed it is fair to say if you are going out in conditions where one person needs a 6.3m boat then at times you will be pushing the throttle and waiting whilst you climb the wave; thats not a great feeling and also means you are working the engine hard burning more fuel. Should you find yourself calf deep in water in big waves the elephant trunks seem to take a long time when the engine is screening away.

If it were me doing what you described Id save my money for a slightly smaller boat.
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Old 15 August 2018, 19:00   #7
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It depends what 115 it is, if it is a mercury/mariner/yamaha 4 stroke for example then I would give it a wide berth on a 6.3.

I had the same engine on a 5.6 and it would REALLY struggle to plane 4 up, was fine once up there.

If it was an optimax or similar then a 115 would be ok but will never set the world alight.
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Old 15 August 2018, 19:10   #8
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A 115hp on an ocean pro 6.3 is absolutely fine and not underpowered at all, I remember rigging quite a few of them with the Yamaha f115 when it first came out 20 years ago, all would do mid/high 30s knots no problem. One was a commercial dive boat which would carry 8 divers plus kit with no issues. If a 5.6 struggled to get on the plane with 4 up it was setup wrongly!

The 6.3 was I thought the best Ocean pro (especially if it was the rare low floor version with the floor positioned one chine lower then normal) it was the largest size they did in that mould, moving up to the 6.5 was a completely different mould and had less deck space than the 6.3.
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Old 16 August 2018, 19:36   #9
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Just go test it! ...and let us know.
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Old 17 August 2018, 03:50   #10
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humber test

testing on sunday.
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Old 17 August 2018, 05:08   #11
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replacement for my stolen rib

Id recommend taking a couple of crew so you can see any change in performance. Its incredible the difference a bit of weight makes! See how much fuel is on board too.

In our Humber 6.3, it jumps up on to the plane in only a few seconds when alone. Add 3 x 15stone blokes and 140L of fuel and its like driving a truck compared to a hot hatch back, pushing the boat over the hump of water takes quite some time. You may find a 115 4S takes forever and you have to shift weight about. As others said, if a 2S, it may be ok.
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Old 17 August 2018, 08:02   #12
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humber test

thanks for that. i will be watching it.
i will probably only rarely be carrying anyone else. but yea, fuel can be heavy.
james.
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