Originally Posted by Starovich
The reason a boat chine walks is instability, its not a design feature.
It means in the current config something is not set correctly, drive a boat like this for long enough and bad things WILL happen.
The reason a boat chine walks is when the boat is being used in a different way from what it was designed, or is set up for. I have only ever experienced chine walking on our boat at over 52knts, with just me on board and very little fuel.
At this speed and configuration the boat is not happy, because the propeller pitch is chosen for two up and much more weight on board (and it's a rubbish propellor). There are identical boats to ours, outfitted with a smaller engine, and built lighter and set up differently which do not chine walk until over 60knts.
If we set our boat up like that, it would not suit what we use it for at all.
What I am saying is, that in controlled conditions, and having taken all reasonable safety precautions it is very good fun to really push the envelope. Running at WOT normally does not induce chine walk, so it is not easy to find. When doing so (as always) I have a life jacket on, a PLB and a VHF. Wearing a helmet is also advisable to protect your teeth.
On smaller boats, such as SR4s etc chinewalking is a much more regular occurance and much easier to achieve, not necessarily by having to look for it.
I am not advocating that people do this, I am simply writing about my experiences. Going very fast on the water is one of the key reasons people have RIBs after all.
This is clearly not what happened in the incident though: with a family on board only someone with complete disregard for not only their own safety but also that of their passengers would be doing this.