Chine Walk - Inevitable?
03-21-2005 | 02:25 PM
#1
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From: Ottawa Ontario
Chine Walk - Inevitable?
Is chine walk an inevitable reality of running all boats with big power, especially smaller boats, less than 25 feet in length?. I know that it's caused by the hull falling off the pad and that it's worsened by drive play, but am wondering if some hulls are designed such that you won't get any chine walk at all - also, some say if you have it you can "drive through it" and get to a higher speed where it no longer exists - whats the reasoning behind that? Thanks in advance for any replies.
03-21-2005 | 10:26 PM
#2
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Joined: Nov 2002
Posts: 2,621
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From: Nashvegas, TN
Re: Chine Walk - Inevitable?
There is actually a very long list of things that cause and aggravate chine walk.
The most common ones are slop in the steering, drive too deep, excessive positive trim, wrong propeller for the given application, poor hull design, lateral balance too far off CG,
and poor driving technique.
As vees rise out of the water with increasing speed they have less hull support and contact, and become unstable. Add in some wind, waves, and wakes and you have more problems, an unstable boat running on an unstable surface.
Stabilizing the drive on I/Os with hydraulic steering seems to be step #1. Raising X dimensions also seems to help.
Try to get as much of your onboard load balanced laterally.
Excessive weight on either side of the CG will cause the boat to fall off to that side. Driving technique is very important.
If you've ever seen someone drive a high perf outboard pad vee like an Allison or Bullet, you'll notice they are always making minor steering inputs to keep the boat up on the pad.
One way to accomplish this is to nudge the wheel to the left when the right side begins to fall, and vice versa. When you time these steering inputs properly, you'll be able to stay up on the keel/pad. It takes some seat time to get this down, but it does work.
Good luck,
Steve
The most common ones are slop in the steering, drive too deep, excessive positive trim, wrong propeller for the given application, poor hull design, lateral balance too far off CG,
and poor driving technique.
As vees rise out of the water with increasing speed they have less hull support and contact, and become unstable. Add in some wind, waves, and wakes and you have more problems, an unstable boat running on an unstable surface.
Stabilizing the drive on I/Os with hydraulic steering seems to be step #1. Raising X dimensions also seems to help.
Try to get as much of your onboard load balanced laterally.
Excessive weight on either side of the CG will cause the boat to fall off to that side. Driving technique is very important.
If you've ever seen someone drive a high perf outboard pad vee like an Allison or Bullet, you'll notice they are always making minor steering inputs to keep the boat up on the pad.
One way to accomplish this is to nudge the wheel to the left when the right side begins to fall, and vice versa. When you time these steering inputs properly, you'll be able to stay up on the keel/pad. It takes some seat time to get this down, but it does work.
Good luck,
Steve
03-21-2005 | 10:35 PM
#3
Charter Member #232
Joined: Oct 2000
Posts: 18,417
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From: Carlisle, MA USA
Re: Chine Walk - Inevitable?
Yup there are boats that don't do it.....CATS 
My hydrostream you had to drive. If you didn't you would be lucky if you could hold on. When running WOT you would actually be more on the bullet of the lower unit then the bottom of the boat. Quite a rush when you are driving it right.
My hydrostream you had to drive. If you didn't you would be lucky if you could hold on. When running WOT you would actually be more on the bullet of the lower unit then the bottom of the boat. Quite a rush when you are driving it right.
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