I will try to answer your question to the best of my ability. Somebody please "chine" in and correct me if my information is incorrect...LOL
A boat hull has chines (raised ridges) that run from the front of the keel and stop near the back of the pad. Some boats when running near full speed have a problem staying up on the center of the pad. The pad I am refeering to is the somewhat flat V area at the very back near the transom. The chines are suppose to help channel water so the V or pad can run stable and run in clean water. When a boat has trouble with chine walking the pad is falling off the V from side to side...look at the severe wobble in the video that is chinewalking at its worst.
Most boats that have trouble with chine walk are rigs that are capable of 60mph or more. Think about it...the faster the boat the less there is in the water to keep it under control. Running a boat a speeds above 60 is really a balancing act. When all you have in the water is very little of the pad keeping it balanced can be a hand full to drive if your set up is not correct.
To help adjust chine walk you can put a jack plate on the transom. That will move the motor/prop back farther from the pad and let it run in water that is less turbulant. With a jackplate motor height can also be adjusted to help control chine. Typically the higher the motor the less chine. Just dont raise the motor too high or you will lose water pressure. A 4 blade prop gets better bite and helps reduce chine walk. Also too much positive trim can promote chine walk. You also need to have your load evenly spread across the boat. Too much weigh on one side will help promote chine walking. So as you can see there are a lot of variables that play into having a perfect set up...correct motor height/set back/trim angle/prop/weight distrubution. When you get things adjusted as best as you can the boat will be balanced on the rear part of the pad and will not fall off from side to side.
The most common method to combat chine walk is to make steering adjustments with the steering wheele. Look on you tube for instructional video's on how to drive a boat that chine walks. It is an esay method to learn but it does take time to learn if you are going to rely on a video to show you how. I recommend to find a boater that know how to drive a boat that chines because that will make the learning process much faster...when it feels like the boat is going to fall off to the side put slight pressure on the steering wheel like you were going to make a slight left turn then bring the wheel back straight. For boats that chine a lot it will look like the driver is whipping the wheel constantly from left back to straight ahead. You do this as smoothly as possible because you are not tyring to change the boat into a left turn. What you are really doing is applying torque against the rotation of the prop that makes the V in the pad jump back ontop of the center of the V in the pad.
Sorry for such a long reply. Hopefully I explained it correctly and I did not confuse you.
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