Chine Walk ?
 

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 :cool:

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 ?

Hydraulic steering will help eliminate chine walking. Also correcting any balance issues will also help. Chinewalking is also affected by the propeller selection. Basically, what is happing is that the boat is falling off the pad, usually this will happen to the right. This is due to prop torque. A experienced driver will be able to feel the boat when it starts to fall off. A quick twitch of the wheel will throw it back up right.

Want to know what Chine Walking is????

Ride in a Velocity!!!!

Hey, Gordo you got a picture or vid. of your old Velocity in that shoot-out up on Omaha?? That was chine walking!! (with a little N.O.S. thrown in):p

I used to run a 90mph 17 foot hydro stream and if you did not know how to drive the thing it would flip right over or through you out. what i found was a good driver could comletly eliminate chin walk. after a while it never did it to me but if someone else got behind the wheel they could not drive the boat at hight speed.

I worked a 24' superboat that had twin 2.4efi motors. After about 75mph it would chine walk so bad I had to back off. Could not drive through it. That is a straight V with no pad or steps.
On an outboard boat you need solid motor mounts and a solid steering system

hugetime1

I hear you. I also had a 17 foot hydrostream. 260hp, foot throttle, jackplate. It only weighed 400 lbs dry. Over 75mph it chine walked horrific. Only an experienced highspeed/small boat driver could get it up into the 90's (not me). I almost killed myself around 85mph on it.

Speed is on the other side of the chine walk.
:D

Oh, Come on.... It's Fun every once in a while!!!

That's why I bought a old 22ft Velocity, just to take people for rides!!:D

Yes, a twin can chinewalk, but in that case it is not caused by prop torque, but usually instigated by irregular water conditions.

As has been said, some hull styles are much more susceptible to it than others.


Steering slop can allow an otherwise stable hull to chinewalk. Tight direct steering can't solve the issue in some hulls, though.

I had almost exactly the same experience as Troutly, except in a 32 Fever. Tabs to the up-stops, trimming up the drives at WFO, quartering 6-inch wind-driven surface, tweakin that last MPH (props spinning in).
One second, everythings fine, next second Holy Sh!t. Almost got ejected. Wifey was apoplectic.

ap·o·plec·tic
adjective

1. furious: overcome with anger

2. medicine exhibiting symptoms of stroke: having the symptoms of a stroke

chine walk and porpoise
 

I have a '81 26' scarab with an arneson 6 . There were holes and upper mounts for turnbuckles all along the trailing edge of the bottom. I assume that there were trim tabs on this at one point. It also had a 3/8" hook on the mid point strake one foot before the transom. I removed the hook and straightened and sharpened the strakes and the point where the bottom and transom meet . I'll have 350 hp SB in this when its finished . More power if I like the handling and performance. anybody with experience with this hull???? thanks andrewmasonsr

I came a little close to having some serious chine walking develop into a REAL problem with my 259 Checkmate w/ an HP500. We were out on a perfectly flat, clear day, sober as all hell, only boat on the lake with my friend driving and me giving a few "driving pointers". We were wide open, trimmed up and caught the only other cross wake on the lake that day (that neither of us saw coming). Next thing I knew, we had water up to the rub rail port, starboard, port, starboard, etc. and getting worse by the milisecond. Thank God, I was able to reach the key and kill the boat while my friend was frozen with the throttles wide open. A few more seconds, I seriously believe we would have hooked, possibly stuffed, certainly been ejected, and who knows where the boat would have gone. I have never taken operating a boat (especially at high speed) for granted again. I drive, keep a kill switch on, and I keep myself FOCUSED on what could be coming even on a perfectly clear day because you never know.

Outboard x HP + Hydrostream or 16' Checkmate = Chinewalk!!!:D

)
quote

Speed is on the other side of the chine walk
someone who knows something about both Velocity rules

Chine walk alot of times is caused frome play in the out drive, when it starts to shimmy the hull reacts the same way, a good steering system will usually correct it, I ran a 24ft pantera at 90mph,and never had a problem

Chinewalk can be fixed buy driver input....... not using less trim and more power. A trolling motor does not cause chinewalk. All the offshore guys should learn to DRIVE the small stuff first. Try driving an Allison Craft at 100 + and you will have a new respect for the talent it requires.

RT

Chinewalk is caused by several different things including balance, wetted surface vs. dry surface, speed, bottom design, water conditions, among others. Typically the wetted surface of the boat begins to dry out leaving not alot of bottom to balance on so then you have to drive it to balance it sometimes you notice people working the wheel in a boat a bit harder than usual this will take the chine out to a certain extent, also somebody made the mention earlier about the speed is on the other side of the chine walk. True comment in certain boats my opinion only is that the boat is chine walking while lifting up off the strakes to begin to run on the pad. I experienced this in a 22 Velocity one time and also in Hydrostreams. Best advice is to become one with your boat and learn how to drive it no 2 are alike. They all have different quirks.

Sean

Very well put, Sean!!

Someone asked earlier if twins "Chine Walk"

I remember a 29ft Powerquest (true V hull, without a Pad) with twin 454/Bravo's, that I drove once that "danced" kinda like "Chine walking" but it was more like the boat would fall to one side, then the other, then back on the drives, then agian to one side...and so on. I'm sure that you could remedy the problem with the use of tabs, but that boat only had the small Plastic "Cheesey" tabs that were not much help!! I wish I could have had more time in that boat to figure it out!!

In 99% a driver with talent. (read know how) can drive this out..... all pad boats will do it, and straig vee boats will do it to a lesser degree. Assuming the boat bottom is straight, and the steering tight, you do not need tabs.

Man I am blown away at the comments on chine walking, actually shocked. What do you guys think is going on in the cockpit of the really fast Vee boats?.

RT

My Bullet will do it when trimmed to the moon.....Not violent & you just have to drive it....

What exactly are you Shocked about?? A couple of people asking questions??

Anybody ever have a cat chine walk? :D

Anybody ever had a V-hull hook a sponson?.....:eek:

I thought Chine walking was how a guy walks after he had a rough sex night with a Chinese woman? :chimp:

Nah nah nah... Capo... that's Chi-nee walk... big difference...........:p

Now spit the rest of it out, just how fast is that little 22 Velocity?;)

I need a lot more power in my 41 f, just can't get it to chine walk, even at 90.

Yeh,

What are you getting at???

chine walk and porpoise
 

Does anybody have experience with early 80's 26' scarab ?? Mine came with an arneson #6 I've eliminated the hook and sharpened the strakes. the motor is a 350HP SB. I stripped every thing out I could and without fuel and misc stuff it went over the scales @ 4000 LBS I bought Eddie Marine trim tabs , I'm not sure whether to mount these following the "V" or horizontal right where the mid point strake hits the transom any thoughts??? thanks AWsr

MORE VIDEO
 

Can anyone else post more video?