'Chine Walk'

Suzuki416 · 01 January 2004, 18:40

Can someone please explain Chine walk to me.
How is it caused etc, etc.

I'm just curious!

Pete

Daniel · 01 January 2004, 18:49

Charles has a good explanantion here http://rib.net/forum/showthread.php?...ght=chine+walk

Although i disagree with his comment concerning 65mph+ since i have driven boats that chine walk at 40knts.

Richard B · 01 January 2004, 18:51

When the boat slaps from side to side at high speed. Usually at the performance limit of the hull, or if the weight distribution isn't right. Commonly caused by large (powerful&heavy) outboards on small to medium-ish RIBs with all the weight at the back.

Larger, modestly powered boats with balanced weight distribution won't usually experience it.

Richard B · 01 January 2004, 18:53

Quote:

Originally posted by Daniel
i have driven boats that chine walk at 40knts.

Agreed - I think that the smaller the boat, the lower speed that chine walking may start.

Suzuki416 · 01 January 2004, 19:05

Thanks,

So as I understand it

big engines + little boats = Chine Walking (maybe)!

So not enough hull in the water will start this off!

CAN this be trimmed out by trim & tilt (without sacrificing too much speed) ?

Pete

Rogue Wave · 02 January 2004, 05:50

I had an Avon 4.7 Sea rider ( I loved that boat and still miss it )
with a Yamaha 70. She was a Pocket rocket and topped out at 42 knots, between aabout 33 and 38 knots she Chine walked quite badly but after a bit of practice I found that I was able to power through it,

The trim did help little bit but I found that by limiting my corrections to the steering when chineing was by far the best way of getting around it. Very very slight movements of the wheel will make it easier to control.

Dirk Diggler · 02 January 2004, 11:54

I've always found that one of the most common reasons for the problem is slack steering and or worn engine mounts!! and I dont mean the bolts through the transom.

Richard B · 02 January 2004, 12:06

Are deep V hulls more prone to chine walk than shallow V, and are RIBs more prone to chine walk with bouncy bits attached to either side?

The Jackeens · 02 January 2004, 12:08

Richard - "bouncy Bits" are you talking about the ball and chain

Richard B · 02 January 2004, 12:12

Your life expectancy isn't looking good, mate!!

jwalker · 02 January 2004, 12:47

Quote:

Originally posted by Dirk Diggler
I've always found that one of the most common reasons for the problem is slack steering and or worn engine mounts!! and I dont mean the bolts through the transom.

Agreed.

The Jackeens · 02 January 2004, 12:53

So whats slack

I f you stand behind when the boats on its trailer and try to move the engine from side to side fro a down central position should you get any movment at all?

I'll try this tomorrow

Paul