I have noticed in a few threads the statement; "the boat will Chine Walk"

What is it?
What causes it ?
What type of boat does it?
Does anyone have any video of a boat doing it?

fightclub

My experience is Vee bottoms run at their limit (Max trim) dance from side to side. Can get violent and create a loss of control.

I have had it in both of my boats, a Warlock and a Fountain. The way I worked around it was to increase the power significantly so that less trim was needed for highest speeds. Less trim equals more hull surface in water and better control.

Doesn't eliminate it, but makes it less severe

Ha!

I've got a drag practice video of one of my old veehulls chinewalking so badly at speed that it shoots a big mega spray off each rubrail over and over. Finally got it bck in shape by the "finish line" and the stopwatches showed it to be one of the better runs of the day.

I'll dig it out. Probably one of the most vivid demonstrations of chinewalking I've seen on video...

That was the same day that a buddy's 18' bassboat made his first pass over 80 when the wind got his trolling motor prop spinning, causing it to yank the boat sideways and toss him out. That was another good illustration for the day - always wear a killswitch (which he was).

Chinewalk is the instability in a hull. it is a basic "for every action there is and equal and opposite reaction" thing... the reaction from the torque from the prop acting on the water acts on the lever arm which is the sterndrive. this causes a moment about the crankshaft centerline... it forces the hull over to the side opposite prop rotation. the boat will then fall to the chine and the water then stops motion and it bounces back to the other chine and then so on and so forth.. hence the word "Chine Walk". it will not stop on it's own.. No not all hulls do this... you CAN drive out of it with some practice... either trimming in to bring more hull into the water for balance, or drive in an arc in the direction opposite to the initial fall... or well you can go to a shorter drive or experiment with props... or bump the wheel slightly in the direction opposite to initial fall... these are just a few of the the corrections...

here's a link to some video in my 16 donzi classic at 72 mph... you can see a bit of chinewalk start to begin and i kinda drive out of it... she has an alpha SS and is very manigable with a 4 blade prop... with the GEN II... well it was on the verge of out of control and a could be a wild ride at 68 mph... i've seen upward of 77 with her and it is comfortable but can be made better...

http://my.tdi.net/~jaroot/Root16Classic.wmv

If that is a "bit" of chine walk... I don't want to see what a lot is...

If I can dig out my old video, I'll show you a "lot".

is chine walk somthing that is more evident in single screw boats over twins?

cool vid jaroot

Total cool Vid jaroot

I dont think that I have ever seen chine walk in a twin screw boat. In my boat, I dont get the chine walk but it will start to porpoise alot when I trim it out too much. I usually ad a little more trim on the tabs till its taken out.

O.K. Mr Jaroot (AKA Mr. Chinewalker) why do twin applications sometimes do the same thing ?