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Old 10 May 2010, 12:39   #11
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Even with a 135 it will probably chine walk, but with a 150 ..
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Old 10 May 2010, 12:44   #12
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Originally Posted by Sonar View Post
I had on the last rib I owned twin 50s on a 5.6 and that was 30 knots.
Thinking 150 may push what could be a heavier rib about the same speed.
Errr, probably closer to 45/50!
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Old 10 May 2010, 13:48   #13
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Errr, probably closer to 45/50!
No 28 knots 4 persons onboard according to a gps

30 knots 2 onboard
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Old 10 May 2010, 13:51   #14
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Even with a 135 it will probably chine walk, but with a 150 ..
What are the symptoms of chine walk ??

what happens when chine walk ??
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Old 10 May 2010, 14:04   #15
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Quote:
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No 28 knots 4 persons onboard according to a gps

30 knots 2 onboard
Didn't mean your Avon-I was referring to this bit,which will be a lot more than 30 knots:-

Quote:
Originally Posted by Sonar View Post
Thinking 150 may push what could be a heavier rib about the same speed.
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Old 10 May 2010, 14:09   #16
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What are the symptoms of chine walk ??

what happens when chine walk ??
This:-
[YOUTUBE]v9Yvj1FPR3s[/YOUTUBE]
The violent tipping/shaking from side to side most noticeable from 1.00 onwards.
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Old 10 May 2010, 14:11   #17
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Didn't mean your Avon-I was referring to this bit,which will be a lot more than 30 knots:-
Hope so myself and the owner would be well pleased but just seen something about chine walking that's bothering me a little now as I fitted a large planing pad going by other posts answered on questions I was hoping porpoising and the walking would be out of the equation

Picture of the hull upside down showing the pad.

Hoping now I have not made a big mistake or I will have to start another one.
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Old 10 May 2010, 15:23   #18
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Just about any monohull is going to chine walk once its getting airborne like that little green boat in the video. If anything your large-ish planing pad will actually moderate it some since the hull won't be "flopping" back and forth across the deadrise.
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Old 10 May 2010, 15:51   #19
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Wow .. the bit you have as the 'planing pad' is normally the only bit of the deep V hull left touching the water when chine walking starts .. so all you've got here is a flat section touching the water at full speed at exactly the angle the water hits it .. Hehe... thats gonna be interesting with a 150 .. Chine walking only happens when enough hull is out of the water when under way at high speed, so balance becomes critical, and when the sea is flat enough, hull contact becomes minimal and over she goes, or when a regular chop dissapears as you enter a flat area round a point for example, hull contact reduces suddenly at a regular fast speed, and over she goes unexpectly.

If you have enough ballast, and trim options, you can mostly correct it .. so dont panick .. but the simpler answer is to not overpower the hull, or trim and throttle back

The Vid Nos posted above does show it, but nothing like the violence I have experienced, in a deep V hull where on a light 5.8M with a 135 it nearly threw us out of the boat when it slapped from side to side unexpectedly

I have owned a hull where the planing pad was rectangular on a 6.3M and didnt have any problems, but the boat was much heavier with a 150 so was not over powered
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Old 10 May 2010, 16:01   #20
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Very interesting So I guess the answer is not to over power.
I am hoping the rib will be quite heavy when loaded .

So would it be better to make another hull with out a planing pad .????
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