29' - wicked bad chine walk
 

I have a 2001 29 ft Fountain with a 575SCi and when i reach the mid 70's, it sometimes does this rock and roll that is so bad that i have to back out of the throttle - like right now !!!

It feels as if it did it one more time (like the 4th time) it would throw me right out of the boat ......

So, ........ does anyone else experience this same deal, and if so, did anyone have the nads to let it go and see what it would do ???

Now, before everyone jumps all over me to say "use your tabs" -- i know that fixes the problem, but as you all know too, that scrubs off speed during those radar runs --

plus, i want to know if it is just my boat or not --

PS - i tried a LH B1 prop verses my RH -- no help there.

Re: 29' - wicked bad chine walk
 

is there a similarity in water conditions when this happens???......Ive heard of some boats (not beaks) that only chine walk in dead calm water.......otherwise doesnt happen.......

Is this a new thing???

Re: 29' - wicked bad chine walk
 

no -- this is not a new thing --

it does not happen on flat unless i quarter into some other boat waves

it does not happen going on top of rough stuff (say 1 footers)

it happens when it is rough during poker runs though, while getting tossed around from all angles (have to run tabs then or else)

in other words -- if i am cruzing say 75 and i hit something that rocks the boat a little, then that starts the chine walk and it amplifies it really (REALLY) quick and bad

i have powered thru while steering hard one way then the other, but i never do that with someone on-board

Re: 29' - wicked bad chine walk
 

i know you don't want to hear this ...............but i owned a 29, lets just say its giving you a warning to put your tabs down a little. the few mph gain isn't worth your safety. my girlfriend also has a nice scare on her knee from my 29 getting out of control. just becarefull when topping out a single engine 29. Tom

Re: 29' - wicked bad chine walk
 

that is what i needed to hear - seriously --

i was thinking about gathering up the nerve to let it go -- to see what it was going to do -- but i think i got the picture now

i have been working on dialing in the sweet spot on the tabs so that they are just touching to help stop 90 % of the events -

i will defintely keep pulling back on the throttle -

- thanks

Re: 29' - wicked bad chine walk
 

Did you remove the "stops" from the tabs that are there from the factory ?

Re: 29' - wicked bad chine walk
 

have you marked the neutral position of your tabs with a piece of tape or a marker on you indicators????
lay a straight edge off the bottom of your boat....put the tabs down to parallel the straight edge.....thats neutral......mark that position on your indicators......then you'll always know if your dragging tab or not........neutral is not nessisarilly halfway up the indicator as I found out after a year of running the boat.........doug

Re: 29' - wicked bad chine walk
 

I have an 05 29 with the 575 and roughly the same stuff happens to me. This weekend out we ran 80 in all types of condiotions that were pretty ideal. But yes it does the same to me at the poker runs at about 75+. One time it did it so my bad I almost dropped to my knees and started praying. It really only does it to me part of the time. Like I was told you have to work the boat up to that high of speeds and find the boats groove, you just cant throw the throttle forward and get your top speed. Some chine walkin is worst than others. I think it has a lot to do with those cross waves which you cant blame all on the boat. Because it is totall fine at those speeds going with the waves, instead of the waves going sideways against the boat.

Re: 29' - wicked bad chine walk
 

birdog -- no stops on tabs - they drop down enough to stuff the beak :rolleyes:

p-m-t --- the neutral position as you described is at 2-1/2 on my tab indicator and that is where i was running at 57 mph with no speed loss -- i am assuming that when i test at 75 mph, it can be a little more before speed starts dropping because the water is coming back up further back behind the boat -- i am going to test for that spot --

tnothin ---- you describe the same deal -- so i guess it is enherent with the beast, and not just my boat

Re: 29' - wicked bad chine walk
 

I have a 27 w/500efi and it chine walks at 71-74mph sometimes. If you can catch it right off you can correct it through steering, if not just back off a little and work back up I find that to be a faster soultion than dropping the tabs. I strongly suggest NEVER LETTING IT GO, it is very possible it could catch and hook, thus throwing you and everyone, and that would be bad :drink:


WILL :D

Re: 29' - wicked bad chine walk
 

There are a few tricks to get the chinewalk to stop. The 29 is a biatch. I have tested many of them at the Factory. And know all the tricks, so that you dont scrub speed.
PM me and I will let you in on a few.

Re: 29' - wicked bad chine walk
 

why not inform the whole group?

Re: 29' - wicked bad chine walk
 

ditto

Re: 29' - wicked bad chine walk
 

Ya me too please

Re: 29' - wicked bad chine walk
 

I have an 04 29' 525... The boat handles best into the wind, against tide with 2' rollers 4' apart. I run out of bay at 78 mph.
I can only imagine what would happen over 80mph with quatering seas or boat wakes.... We have to remember that every boat runs out of hull... We all want to squeeze every ounce of speed out of it, but we all want to live to run another day..

WC share your experience... You could save someone a lot of pain......

Re: 29' - wicked bad chine walk
 

My friends 29 has "stops" that keep the tabs from RETRACTING all the way UP....Thats what i was saying..
Dont all the 29s have these ?

Re: 29' - wicked bad chine walk
 

thanks birdog -- friend of mine told me that is what you meant (stopping the tabs from retracting that is)

He told me Reggie does that to prevent his boats from porpoising (did i spell that right?? :( )


appreciate all the responses -- sounds like this might be a fairly common one with the 29's

Re: 29' - wicked bad chine walk
 

I had the same problem and found that I was overtrimming the drive - my situation may be different as I am running an imco upper and a -2 shortie. I spent some time doing testing with a friend who has some past experience racing the 29 in factory class - we found that, with my boat, I don't ever need to trim over 4 - 4.5 on the drive. I did not gain any speed past 4.5 but any further trimming would cause the boat to intermittently chine walk.

Boat is a 98 w/ a 525SC running 7 lbs boost.

Re: 29' - wicked bad chine walk
 

Awe come on, where all family here :drink:

Re: 29' - wicked bad chine walk
 

Did you try with your drive in with it out the boat is less stable
i have a 03 29' 575 when mine gets loose i trim down to 1.5 or 2 but keeping the drive in helps keep it stable

Re: 29' - wicked bad chine walk
 

4CLOZIN,

yep -- loose too much speed though on the radar run with the bow in water -- it works though --

it all seems to go away once i am at 80 mph and over -- things seem to be OK up there -- must be up on its tail more and inertia takes over keeping it straight and level

Re: 29' - wicked bad chine walk
 

Hey dirtlawyer
Just curious I have a 2000 29' with a carb 525 SC running about 6-7lbs.(540Hp) I am seeing 72-73 all day and maybe a 75. I turn a 23P Mirage plus to about 5000.

What is your set up and what do you see. It feels kinda low but I know the 575SC factory test only hit 82 GPS so it may be right.

Thanks.

Re: 29' - wicked bad chine walk
 

I have a 1997 29 single with about 700 - 750 HP that will do 90 mph. I usually don't see the chine walking until I hit 80, then just drop the tabs a bit and it mellows out to 90.

Re: 29' - wicked bad chine walk
 

Fountaineer -- assuming your tabs are set up to be neutral at 2-1/2, what do you run your tabs at --

I found 2-1/2 is good in rough water with no speed loss, but it does not prevent the chine walk

Re: 29' - wicked bad chine walk
 

Can't you drive out of the chine walk???
You can on any other pad bottom boat such as a Velocity.
I know Fountain has changed his bottoms over the years, but I assume even the ventilated bottoms are still a version of the original pad bottom Fountain started with. If so, you should be able to keep it balanced on the pad with "bumps" to the steering.

Re: 29' - wicked bad chine walk
 

you can't drive through once it starts the hard walk two to three times -- you can read a couple responses above and see what i mean -

Its hard to explain, but there are two different magnitudes of chine walk here, and the one i am talikng about, once it kicks in, it really throws you --

The bumps to the wheel may work if done soon enough - that is what i am trying now - trying to predict and get rid of it before it gets violant - once violant, you have to let off now !!

I am sure part of my problem (and the folks above) is that we are well over the power that any single 29 has ever seen coming out of the factory - so we created our own problem here. Its not Fountain.

Re: 29' - wicked bad chine walk
 

I have basically the same set up (running 7 lbs boost) but I have gone to an IMCO Upper and -2 lower. I typically run a labbed 28P Bravo RH that has been tuned up a bit. Best I have seen on a handheld GPS was 78.1 - my GPS speedo recall shows 77 right now. Both of those speeds were obtained with a labbed Bravo 30P. The 30P is a little slow to come onto a plane, but once she rollw over, the performance is great.

The -2 lower makes the boat run flat, so I have also taken a lot of unnecessary weight out of it. Typically with 4 people and 1/2 to 3/4 fuel I hit 75 with the 28P Bravo turning 5100 - 5150 rpm.

If I recall, my boat was shipped from the factory with a 27 Hydromotive. If you are using a 23P 3 blade and not banging the h*ll out of the rev limiters all day long, then I would say something is not quite right. How many hours do you have on the motor? If you are over 225 hrs, you should have rebuilt the blower by now (especially since you are using the smaller pulley). Also - have you checked the heads lately? I just replaced the exhaust valves and springs, as well as my manifold - it was probably within 5 hours operating time of letting loose (motor has about 240 hours tt).

Re: 29' - wicked bad chine walk
 

Well yes, if you wait too long to correct chine walking it does become violent and you're right you want to correct for it before it becomes unmanageable.
Here's how I was taught....you want to keep your eye on the bow, when you see it dip, or fall to the left or right, bump the steering the opposite direction just a bit and then make sure you straighten the wheel. You want to make small corrections or bumps. If you turn the wheel too much you will make things worse. So basically you bump left, straight, bump right, straight...ect, balancing the boat. There is feel involved so make sure you're arms are relaxed, don't stifffen up. It is small corrections...not large ones. It takes practice to get it right and to feel the boat fallen off the pad.
To start, once you feel, see the bow start to fall left and right bump a couple of times first just to the left until the boat feels its not falling to the right...from there just watch the bow, make small bumps until you get the hand of it.
I don't see any reason why you can't drive out of this condition, unless you don't have hydraulic steering.

Re: 29' - wicked bad chine walk
 

Thanks Chase910 -- i was given similar instructions by another and it seems to be working -- hasn't done it since but not much boat traffic lately

Pirates Run this weekend with a radar run afterwards --- that will be the real test !

Re: 29' - wicked bad chine walk
 

chambersgc,
I usually drop the tabs to 3 and with a little bit of driving can stay straight and smooth at 90 mph

Re: 29' - wicked bad chine walk
 

Results are in -- Ran the entire Pirates Run, and the radar run, with NO Chine Walk -- and believe me, it would have before i learned a few trick off this thread -- i never used tabs either -- left them in the neutral position at 2-1/2 :p :D :drink:

-- it is exactly what you said Chase 910, there is a feel involved and knowing when to react to prevent the big one. Thanks too WCMarine - i learned a lot here --

P.S. -- took her out yesterday with a nice North wind and some 12" chop and hit 87.4 on GPS :eek:

That's a stock 575SCi with only a 3/8" smaller blower pulley and a water injection kit that i fitted under the throttle bodies.

Re: 29' - wicked bad chine walk
 

Congrats!!!
Just like if you can drive a stick you can drive any auto
you'll be able to drive any boat, once you can master a pad bottom boat.

87.4...wow, that's cookin in a single 29 with that power!

Re: 29' - wicked bad chine walk
 

Congrats!!!
Just like if you can drive a stick you can drive any auto
you'll be able to drive any boat, once you can master a pad bottom boat.

87.4...wow, that's cookin in a single 29 with that power!

Re: 29' - wicked bad chine walk
 

It's a padded hull, they are gonna chine walk, is there any way you can drive it out?

i need to take a level to my tabs, my stops are at 4.5, and my chine walk can be VERY bad

Did you notice you replied to a thread that is over 11 / eleven years old? You must have some real bad azz chine walk goin' on.