Chine Walking

Andy Moore · 14 February 2006, 09:50

What is chine walking? What's the best way to trim etc so as not to induce it? If it happens, how do you stop it?

Thanks.

Jono Garton · 14 February 2006, 10:05

Hi Andy

A Few things can cause chine walking, the most common is trimming up or out to much. If you do trim up or out to much then simply trim back down or in again.

Regards

Jono

Bigmuz7 · 14 February 2006, 13:12

I used to have a Northcraft 5.8 that used to do it only at full bung. it was frightening. The hull would suddenly flip to the left, then back to the right. You had to be a wee bit sharpish on the throttle to kil it, In the end, the dealer fitted a wedge to the transom, so I could trim the motor down further, which cured it. It only happened in minor to flat seas, since it was these conditions that would get enough of the hull out of the water. The other thing I used to do to help prevent it was use water ballast in the bow, get about 4 plastic 25L drums full of seawater. Wasn't pretty, bit it worked. The thing about it was, whenever it happened, it was your crew that got the willies, not nice.

Charles · 14 February 2006, 13:28

Quote:

Originally Posted by Andy Moore

What is chine walking? What's the best way to trim etc so as not to induce it? If it happens, how do you stop it?

Thanks.

The 'search' facility in this forum is quite excellent. I find that there are rarely any new topics surfacing, rather discussions and questions related to subjects already covered in great detail elsewhere.
Chine walking is a good example of this:
http://rib.net/forum/showthread.php?...ght=chine+walk
http://www.rib.net/forum/showthread....=chine+walking

phantom 19 · 15 February 2006, 00:34

Best boat to experience chine riding is a 5.4 searider they go all over the place.

boatster_sr4 · 15 February 2006, 03:03

Quote:

Originally Posted by phantom 19

Best boat to experience chine riding is a 5.4 searider they go all over the place.

Thats not good to hear.

Biggles · 15 February 2006, 10:26

If not careful I reckon my boat could throw you out once it starts chinewalking.

Nearly caught me out the first time I experienced it.

Something I must remember next time I put a new engine on is not to open it flat out straight away. But there again that wouldn't be fun...

phantom 19 · 15 February 2006, 11:44

I am not a fan of the searider! I had a 5.4 centre console with yam 90 on it was terrible had to constantly fight it if you opened it up. I very nearly fell out on a flat day when it suddenly developed a chinewalk. I sold the SR for £500 and put the 90 with tuned ex. turning a 24" surface prop on a Ring 15 which was much more fun, you could really scare yourself chinewalking then.

Both of the old and newer styles of 4m seemed the same when equipped with upper end of hp rating.

DavyBuoy · 15 February 2006, 12:11

I must be doing something wrong!
Have had my Searider 5.4 for over 20 years and have never experienced chine walking.It was originally fitted with a Johnson v4 90hp and more recently with a Tohatsu 90hp.Both engines were fitted with Doel Fins on the cavitation plate and the boat is regularly used loaded with diving gear and empty.
Ask Nasher about chine walking,he fixed a long shaft Suzuki 55 to his 4mtr Flatacraft and the thing acted like a corkscrew first time out.We fixed a set of Doel Fins to it - no more problem !!
,

Biggles · 15 February 2006, 12:13

As previously posted the chine walking is caused by having the engine tilted up too far.

Tilt it back in and the chine walking goes, but you lose a few knots off the top end.

All comes down to getting particular experience on your boat.

Andy Moore · 15 February 2006, 13:04

Thanks for all the responses. We will experiment.

Matt · 15 February 2006, 13:09

Um. Yes and No.
Doel Fins are a bit of a band aid solution. If they're curing it, I'd have to ask whether the chinewalking is actually the motor fishtailing?

There is a possibility of any V monohull to chinewalk once it's going particularly fast. Once the final set of spray rails are out of the water there is a tendency of the boat to start walking. More so on non padded bottoms.

Part of it is driving ability - it's a balancing act. The other part is setup of the boat. Steering slop, foot throttle (so you can steer with 2 hands), engine height, weight placement, etc.

The lazy mans approach is to trim in, or ballast the bow, but that's at the expense of top speed.

The Garfish · 15 February 2006, 14:03

Quote:

Originally Posted by MadMat

Doel Fins are a bit of a band aid solution

yupp.

Matt · 15 February 2006, 14:12

Carl · 15 February 2006, 14:42

Matt · 15 February 2006, 15:56

They're anti stuff wings, not anti chinewalking!

Bigmuz7 · 15 February 2006, 16:08

You need to paste that moustache on a bit lower next time you go out hehe

The Garfish · 15 February 2006, 16:23

Quote:

Originally Posted by MadMat

They're anti stuff wings

i noe dat yew nobbur.

i woz givvin yew a tipp forr yorr nekst raice

gArf

Gav · 15 February 2006, 20:40

jeez matt, those should be called "anti muff fins"!!

Rogue Wave · 15 February 2006, 23:06

Quote:

Originally Posted by boatster_sr4

Thats not good to hear.

not a problem buddy, you can get through it It's character building but once you have the feel for the wheel it's not problem to control