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Old 08 June 2004, 17:46   #1
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Humber Rib repower

Bit of advice please. I have a Humber 6metre destroyer rib with a 90hp, but I want to get a larger enngine on it.

Budget dictates two stroke so is it a Yamaha 115 or 130 hp.

Does anybody else have a similar boat with either of the above engines on to give me a rough idea of realistic speed achievable.

Thanks in advance

Martin
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Old 08 June 2004, 18:04   #2
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Happy New Resolutions!!! : RIBbing for the craic!!!
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Old 08 June 2004, 18:06   #3
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Old 08 June 2004, 18:42   #4
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Quote:
Originally Posted by Martin
Bit of advice please. I have a Humber 6metre destroyer rib with a 90hp, but I want to get a larger enngine on it.

Budget dictates two stroke so is it a Yamaha 115 or 130 hp.

Does anybody else have a similar boat with either of the above engines on to give me a rough idea of realistic speed achievable.
Same question as above but I am thinking Suzuki 140/200hp on a 6.3 Ocean pro.

Martin hope you don't mind me jumping in on your thread.
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Old 08 June 2004, 19:43   #5
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I had a Destroyer 6.5 and it had a few motors in its life. 200 Mercury, 150 VRO Johnson and, latterly, a 200 Suzuki. The Suzi was the best by far, in all respects, and it's midrange power leaves the others floundering.
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Old 09 June 2004, 04:56   #6
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I`ve got a 5.5 Humber which is spec`ed for a 135. But the guys at Humber beefed up the transom and they put a 150 Optimax on it cause its the same block size.

My speed to other day with 6 on board fully fueled was 42.6kt

With very little fuel and just one i`ve pushed 48kt. One ripple tho and it goes pete tong!

Chris
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Old 09 June 2004, 05:35   #7
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Quote:
Originally Posted by Martin
Bit of advice please. I have a Humber 6metre destroyer rib with a 90hp, but I want to get a larger enngine on it.

Budget dictates two stroke so is it a Yamaha 115 or 130 hp.

Does anybody else have a similar boat with either of the above engines on to give me a rough idea of realistic speed achievable.

Thanks in advance

Martin
Martin, I had a 5.95 Osprey Viper with 115 v4 Yamaha. Top speed was 38 mph with 17" prop and four divers + kit on board. It would handle a 19" prop lightly loaded but rarely ran it like this. Fuel was 8 gph. Good engines by the way.

Pete
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Old 09 June 2004, 06:15   #8
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Go for an OptiMax.

I`m blown away at the fuel economy. The pick up is mind boggling.

Down side is they are expensive to service. The yamaha's I`ve used seem to burn a lot of oil in comparison but they keep going going and going. All with no problems.

You do pay a premium for the Yamaha's and the Optimax has a 3yr warranty for less wonga.

Horses for courses.

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Old 09 June 2004, 07:22   #9
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Quote:
Originally Posted by Martin
Does anybody else have a similar boat with either of the above engines on to give me a rough idea of realistic speed achievable.
I too have a 6metre Destroyer but with 140 Suzuki 4-stroke on it. Max speed is just on 43 knots, 2 people up and full of fuel. 9 people with lunch kit etc... slows that down to 33 to 34knots.

At WOT in choppy conditions it's a hold on tight situation, but the boat still feels secure. Slow down to 35knots, and everything gets far nicer and you don't have to hold on so tight.

Fuel economy is great, 4-stroke isn't the fastest engine to get to top speed, and I dare say it would probably be on par just about with a 130 2-stroke engine for top end speed.
I generally cruise between 25 and 35knots depending on conditions, and the boat is very comfortable in this range and the engine doesn't seem hassled in any way.

-Alex
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Old 09 June 2004, 09:37   #10
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Martin how about this from http://www.waynemaddoxmarine.co.uk/

"While stocks last we are offering the Mercury 150HP OPTIMAX L WITH SMART CRAFT GAUGES & LASER II S/S PROP

for only 6999 00 INCL VAT"

Now how do I persuade the wife that we knead one?
Nick
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