chine walking question

[eliminated1]

I know every boat is different but i was told to put trim tabs on my boat strait across the hull but it didnt help at all . i was told buy others to put them at angles which is better i have a hallet 21ft ss and at 77 mph it starts dancing. HELP

[Quest4Fun]

I know every boat is different but i was told to put trim tabs on my boat strait across the hull but it didnt help at all . i was told buy others to put them at angles which is better i have a hallet 21ft ss and at 77 mph it starts dancing. HELP
Don't go over 76 mph :D :D

[cc322]

Most tabs follow the contour of the V that is the angle about 12" away from the outdrive good info right here. What size tabs did you put on that 21?
http://www.bennetttrimtabs.com/stinstall.htm
btw I just had tabs put on our Lavey and the boat fells much more hooked up if that makes any sense.

[eliminated1]

12 inchers

[eliminated1]

we tried putting a shorter lower unit im curious if i set the drive back with a stand off box if that will help

[talkinghead]

I had a 27 ft. Sea Ray that chine walked - I concluded it's basically bad hull design, and that there's not much you can do about it.
I always thought it happened primarily to narrow boats with a high center of gravity.

[vmjtc3]

Don't go over 76 mph :D :D
Better yet buy a skater:D

[BajaMike]

Any small boat will chine walk as you get close to the max hull speed and you pull the drive up out of the water.....basically you don't have much hull in the water...just the drive is in the water...tabs won't help at all.
A shorter lower unit will give you more speed but also more chine walk. Trim the drive down a little bit and slow down....you are at max safe speed for that hull......

[ToMorrow44]

I have a similar problem with my boat. I've tried all kinds of different props and gear ratios and it still does it. Putting the tabs at level or just lower than level with the bottom of the boat will help settle it down a bit, but also scub off speed. Depending on your X dimension, adding the shower lower should give you better handling at higher speeds judging by my research. Overall, I agree that a lot has to do with the hull design and sometimes the boat just does not want to go that fast.
-Tom

[TCHB]

One of the biggest complaints of high performance boats - particularly V-bottoms - is that of the boat "chine walking". Chine walking occurs when the boat is running at high speed - usually at 65mph or higher - and because of the size of the boat trying to run on very little hull, it will fall off to one side, then flop back to the other, etc. etc. There are many myths to chine walking, i.e. "A four blade prop will cure your chine walk". Unfortunately, that is not true. True, a properly set up boat will be easier to drive and may chine walk less than a poorly set up hull, but chine walking occurs due to the laws of physics. The true way to reduce or eliminate chine walking? Learn to drive the boat.
Many dealers will sell you a boat cheap, then hand over the keys and send you on your way. You should expect the dealer to show you how to drive and handle your high performance boat. A tip to help eliminate your chine walking is this: Always keep the boat guessing. By just holding the steering wheel, you're going to allow the boat to get into a rhythm which will lead to chine walking. Start out by "tapping" the steering wheel to the left - against the torque. Then as the boat begins to fall to the left, release the steering wheel from the torque and turn the wheel slightly to the right. As the boat begins to lean to the right, return the wheel to the left against the torque.
Remember this - KEEP THE STEERING WHEEL MOVEMENTS SMALL.
By oversteering, you could do more harm than good. Try to imagine standing on a 2X4 with a ball underneath it. As the board leans to the left, you have to shift your weight to the right in order to keep the board from hitting the floor.

[XTRM22]

What TCHB posted is text book correct, (in fact it's probably right out of somebodys text book) The problem with running your tabs flat is that they are so high above the water at speed, that 12" tabs aren't long enough to reach the water and if they are only the outside corner is touching, and then it's probably not enough surface area to help. Running the tabs flat works good for solving chine walk, but a 21' boat is gonna need 18" tabs min. I've seen 28' boats running 24+ inch tabs to keep em level at high speed.
Chuck

[RP2]

Any small boat will chine walk as you get close to the max hull speed and you pull the drive up out of the water.....basically you don't have much hull in the water...just the drive is in the water...tabs won't help at all.
A shorter lower unit will give you more speed but also more chine walk. Trim the drive down a little bit and slow down....you are at max safe speed for that hull......
Not true... tabs will help if they are properly isntalled and are the correct size for the boat.

[andy01]

That boat can go a lot faster then that. It needs a huge tab, 12's are not enough. Go 18 and see how it runs. Don't angle them to match the bottom, it works like when you snow ski, and do the snow plow. It will really slow the boat down. Just run straight tabs, it will work. That boat should run well past 100.
Andy

[andy01]

One of the biggest complaints of high performance boats - particularly V-bottoms - is that of the boat "chine walking". Chine walking occurs when the boat is running at high speed - usually at 65mph or higher - and because of the size of the boat trying to run on very little hull, it will fall off to one side, then flop back to the other, etc. etc. There are many myths to chine walking, i.e. "A four blade prop will cure your chine walk". Unfortunately, that is not true. True, a properly set up boat will be easier to drive and may chine walk less than a poorly set up hull, but chine walking occurs due to the laws of physics. The true way to reduce or eliminate chine walking? Learn to drive the boat.
Many dealers will sell you a boat cheap, then hand over the keys and send you on your way. You should expect the dealer to show you how to drive and handle your high performance boat. A tip to help eliminate your chine walking is this: Always keep the boat guessing. By just holding the steering wheel, you're going to allow the boat to get into a rhythm which will lead to chine walking. Start out by "tapping" the steering wheel to the left - against the torque. Then as the boat begins to fall to the left, release the steering wheel from the torque and turn the wheel slightly to the right. As the boat begins to lean to the right, return the wheel to the left against the torque.
Remember this - KEEP THE STEERING WHEEL MOVEMENTS SMALL.
By oversteering, you could do more harm than good. Try to imagine standing on a 2X4 with a ball underneath it. As the board leans to the left, you have to shift your weight to the right in order to keep the board from hitting the floor.
Where did you copy this from? Family fishing guy mag.?

[gfinch]

TCHB is correct about having to anticipate the walk.
Make sure any looseness in the steering and mounts is addressed.
Weight balance in a boat is critical also.
If you want to experience real chine walk try to drive an Allison, Bullet etc., when it gets on the pad above 60mph. We call it "Washing the decals". At 75 to 80 and up, your balancing on 1 1/2' of hull and the bottom of the lower unit.
Once you learn, like a bike, you should be able to drive anything. It becomes second nature.
Good luck, keep it tight and balanced.

[TCHB]

A tech article and yes most modern fishing boats are faster than most performance boats running down the Parker Strip.
I had a Howard 22 Offshore that would chine walk when trimmed up in certain water conditions. It is not something that is fun and should be avoided.

[TCHB]

If you ever watched the v bottoms race at the real Parker 9 hour enduro drivers would keep the boats on that edge for hours.

[TCHB]

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[396_WAYS_TO_SPIT]

He wants to get this thing fixed before I bring out the new ride and saw him off :D :D :D :D
71 will do him good in chop but when the smooth water comes, look out for the brotha in the 100mph jet:D that willbe passing by:D :D

[talkinghead]

TCHB thanks for that excellent information...

[scarabrick2]

Larger tabs and a 5 blade
I got a 26 5 blade to sell you maximus labbed by merc.
It should do the trick

[ULTRA26 # 1]

He wants to get this thing fixed before I bring out the new ride and saw him off :D :D :D :D
71 will do him good in chop but when the smooth water comes, look out for the brotha in the 100mph jet:D that willbe passing by:D :D
Mike,
Is the Gullwing about ready to run? What did you end up using for power? We need some pics
John M