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Author Topic:   Chine-walk?
whalerron posted 09-08-2001 11:05 PM ET (US)   Profile for whalerron   Send Email to whalerron  
I have seen the term "chine walk" many times in this forum. What the heck is chine walk? It seems to describe the way a whaler acts when it is going at speed which is faster than the hull is designe for. So what is it and when does it happen?

- ron

dauntlass 18 posted 09-08-2001 11:54 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
Try this web site www.yachtsurvey.com You will have to look through his index of articles to find the article titled "Chine Walking".I think my Conquest has a chine walk condition at certain speeds ,on my boat a slight list to port.A gentle hand on trim tab switch on my boat corrects condition or a slight change in speed will also correct condition.
Tom W Clark posted 09-09-2001 12:18 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
whalerron,

Chine walking is when the boat rapidly oscillates from listing to one side to the other while the boat is going very fast. Essentially the chine (the point where the vertical plane of the side of the hull meets the relatively horizontal plane of the bottom) acts like a trim tab to arrest the list and then rebounds the hull to the other side where the chine on the other side repeats the process.

Chine walking is familiar to anybody who owns a classic 15' Whaler powered with all the 70 horses she's rated for. At top speed the boat can tend to become a little unstable and "chine walk". It can be an unnerving experience. I owned such a boat and was always amazed that it was rated for 70. On the other hand I loved it! I've never owned a boat before or since that seemed to go so fast. Just something about being really close to the surface of the water and going 45 mph.

whalerron posted 09-09-2001 11:25 PM ET (US)     Profile for whalerron  Send Email to whalerron     
I understand. Ok, so at what speed do you start experiencing this with a Montauk hull?
Tom W Clark posted 09-10-2001 12:21 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I owned two Montauks, both with Johnson 90's. I never had them chine walk, but I imagine that if you could get a Montauk up well over 50 mph it might happen.
Bigshot posted 09-10-2001 11:27 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
The smoother the water the easier it is. If you break the 45 barrier on a montauk, she can do it. Buddy had a 16 with a 115 Merc and she got scary now and then, not as bad as my 15's though.
where2 posted 09-11-2001 03:41 PM ET (US)     Profile for where2  Send Email to where2     
I would suspect a 17' would begin to walk above 45mph as my 15' Sport begins chine walking around that speed and continues to get worse as the speed approaches 50mph. Yes, sea level air pressure and a well tuned 70Hp Johnson will push this 15' hull to 50mph.

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