repairing slight hook in banshee hull

[tyeechaser]

I noticed I have a slight (1/8") hook in the aft portion of my banshee hull. Good news is it is flipped over and ready for filler and fairing. I have a five ft steel straight edge and am laying it agains the transom bottom to a point forward 5 ft. The hook occurs about two ft forward of the transom. (Probably rested on a roller at some time in its life) If I am fair aft to forwar and side to side for 5-6 ft is that sufficient for a 15ft boat? Thanks for the help. Want to get it right while it is upside down. Mike

[Tim_Mattson]

Mike ,
Now if you were racing it would matter,but I don`t think so and feel an 1/8`` will only lose you a mile or so an hour tops.
I bent my 1st Safe boat
proto 5`` over the first 8 feet of .100 corrogated hull at one time ,and lost almost 10 mph before it finally mattered on a hot summer day.......and top speed dippped into the 30`s.Couldn`t get any bow lift no matter what trim angle.A hooked hull just won`t lift as you trim which lightens the steering torque.The worst is when it makes it pull hard to one side as the bow is forced down.
A 1/4 to 1/2`` over 2` would be the time to get fairing and filling.

A neighbor just told me he put a 1/4`` tall tapered shim on his transom edge one time to keep a 40` boat from porpoising.Said he loved the way the bow stayed down and was a $1000 or so cheaper than the Hydr. trim tab set-up most run and then maintain.
He said he duct taped it to test it out ,then glassed it on while drydocked.
I`d not worry too much and proceed.
The bigger the HP ,the more it will also matter....
TimM

[McSkagit Tim Jones]

Hooks and Rockers and other hull irregularities

Generally speaking keeping the hull as perfect as possible will illiminate handling issues.

I have an article from Professional Boatbuilder some years back, that looks at handling problems with planning hulls (which are fairly common). As I recall the story is called Dynamic Hull Instabilities.

Article decribes various hull design and construction issues, such as hooks. As little as 1/4 inch out can create serious handling problems.

Your boat is faily small, but probably worth the effort to make it as true as possible.

Tim