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Old 17 May 2012, 03:12   #1
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Four Stroke and Water Skiing

Hi,

I am purchasing a 6m RIB from China which weighs 640kg.

The manufacturer says a 150HP is the max and a 115HP two stroke is recommended. I am actually wanting a Four Stroke. Would a 130 - 150HP four stroke be capable of easily pulling out a 100kg water skiier without dragging them through the water for too long.

Also are the four strokes too heavy also?

The reason I ask is a relative suggested if we are wanting to ski, you shouldn't get anything other than a 2 stroke as the low down torque isn't sufficient in a 4 stroke.

I would love anyone's opinions on this.

Thanks everyone.

Ryan
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Old 17 May 2012, 03:23   #2
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Hi Ryan, welcome to Ribnet.

First of all, I don't want to p1ss on your parade, BUT be very careful what you buy RIB wise from China, plenty of horror stories on here.

Accepted wisdom used to be, that 2 strokes were lighter, more responsive & had more lower down grunt. The gap is closing with the newer generation 4 strokes. Personally I'd go 2 stroke every time, they are simpler in construction, easier & cheaper to maintain & overall just as economical.
A 130-150 of whatever flavour should easily pull a skier on a 6m boat.
A 150 Etec will pull 2
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Old 17 May 2012, 03:26   #3
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4 Stroke Performance

Thanks Dave - I am tending to think I really should be getting the 2 Stroke.

Would a 150 four stroke pull a skiier though sufficiently?

Thanks again,
Ryan
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Old 17 May 2012, 03:27   #4
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Anything over a 50hp should be fine for skiing I've pulled a15 stone chap with a 70hp at the back of me with my last boat I had no problem
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Old 17 May 2012, 03:30   #5
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A mate has a 5.3m Tornado with a 75HP 4 stroke Suzuki and its a fantastic ski boat. Loads or what seems to me to be Torque. I would imaging the Chineese boat will be built light to save money on materials so you might be surprised how small and engine will pull skiers.
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Old 17 May 2012, 04:08   #6
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If it helps, I bought my 6m with 115 4 stroke off a couple of wake boarders, it was plenty powerful enough just did not have much of a wake, once you get to a certain size the extra drag on the boat is a much smaller percentage.
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Old 17 May 2012, 04:10   #7
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China

Quote:
Originally Posted by Pikey Dave View Post
Hi Ryan, welcome to Ribnet.

First of all, I don't want to p1ss on your parade, BUT be very careful what you buy RIB wise from China, plenty of horror stories on here.

Accepted wisdom used to be, that 2 strokes were lighter, more responsive & had more lower down grunt. The gap is closing with the newer generation 4 strokes. Personally I'd go 2 stroke every time, they are simpler in construction, easier & cheaper to maintain & overall just as economical.
A 130-150 of whatever flavour should easily pull a skier on a 6m boat.
A 150 Etec will pull 2
Just another question - what 'horror' stories have you heard with the Chinese RIB's? I think a lot of RIB's these days are made in China now and I have heard a lot of known brands have now moved their operations to China and are still good as gold.

Thanks,
Ryan
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Old 17 May 2012, 05:24   #8
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Quote:
Originally Posted by ryanmollaun View Post
Just another question - what 'horror' stories have you heard with the Chinese RIB's? I think a lot of RIB's these days are made in China now and I have heard a lot of known brands have now moved their operations to China and are still good as gold.

Thanks,
Ryan
I guess in some cases yes that's true, but like the old saying... you only get what you pay for so if it sounds to good to be true for me it's a I have had one and it was of poor build quality, here's a link to one story of a Chinese build. spider cracks in gel coat and here's another Getting full refund on rib not fit for purpose .

Both stories ended well as both of us got full refunds back on our ribs. So hats off to the dealer involved.
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Old 17 May 2012, 06:07   #9
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Quote:
Originally Posted by Pikey Dave View Post
Hi Ryan, welcome to Ribnet.

First of all, I don't want to p1ss on your parade, BUT be very careful what you buy RIB wise from China, plenty of horror stories on here.

Accepted wisdom used to be, that 2 strokes were lighter, more responsive & had more lower down grunt. The gap is closing with the newer generation 4 strokes. Personally I'd go 2 stroke every time, they are simpler in construction, easier & cheaper to maintain & overall just as economical.
A 130-150 of whatever flavour should easily pull a skier on a 6m boat.
A 150 Etec will pull 2
I'd agree with all of the above other than, 4strokes are actually better ski tugs. Low down torque, nice snooth pull out.
Etecs ideally, require re-mapping to make a decent ski boat motors. Mine is a nightmare, all or nothing pull out and doesn't like holding a steady lowish speed. A mm of loud stick may up the rpm by 500, which annoys the hell out of those on the end of the line.
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Old 17 May 2012, 06:38   #10
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Quote:
Originally Posted by kerny View Post
I guess in some cases yes that's true, but like the old saying... you only get what you pay for so if it sounds to good to be true for me it's a I have had one and it was of poor build quality, here's a link to one story of a Chinese build. spider cracks in gel coat and here's another Getting full refund on rib not fit for purpose .

Both stories ended well as both of us got full refunds back on our ribs. So hats off to the dealer involved.

Wow - you had me worried for a minute there. I did a bit of research and digging and found that the weights of the SeaPro RIB's which are the lemons you were referring to are in fact more than 50% lighter than they should be.

I referred to our manufacturers spec sheet and compared it to SeaPro's here...
SEAPRO :: Seapro Ribs

For example... Their 520 model is 165kg whereas the manufacturer I am using is 400kg. SeaPro's largest model is 720 which is 520kg whereas our manufacturer is 800kg.

So I think it is a manufacturer specific problem in that they are obviously using paper thin fibreglass in their hulls.

It is unfortunate I think that they would be so irresponsible to sell such crap really. Few extra $$$ to make a stronger hull and they might be a good RIB.

Here is a link to the one we are getting made...

Rigid inflatable boat with teak floor - Detailed info for Rigid inflatable boat with teak floor,RIB boat,Rigid inflatable boat with teak floor,Rigid inflatable boat with teak floor on Alibaba.com
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