Re: Boats bounces at higher speeds
A hook (when there is a cavity) will typically act like a trim tab and push the bow down. A Rocker (where the bottom just in front of the transom is lower than the transom- so it would "rock" if it were on a flat surface) will allow the stern to sink down slightly at speed, and set up a porpoising condition. If that's the problem, and the depth of the non-flat section isn't too bad, the easiest way is probably to add trim tabs. You could also add some layers of glass at the transom (and in front of the rocker if it's big) to bring the bottom flat in that area 4-5' in front of the transom. But take a look with a straight edge, and let us know what you find. Maybe some of the other straight inboard guys will catch onto this thread and give you some more advice also. I've never had the problem, just read about it.
If it turns out to be the bottom out of flat, and it's a trailered boat, you'll want to look into how the boat is supported by the trailer.
If you don't see any bottom problems, then I'd go with weight distribution being the most likely problem. You could try adding a couple of batteries or other heavy objects far forward in the bow, and see if this alleviates the condition. If that works, then you can look at things like moving the gas tank and batteries forward. If just a little weight works, just leave whatever you used there...moving tanks and batteries is a lot of work!
