Steps angle

[Flysafe]

My name is Jorge Lopes and I live in Lisbon , Portugal .

I have as hobby radio control and I would like to make one miniature yacht, a deep vee hull with two steps and strakes, I made part of the hull in 3D, but I have a problem with the two steps angle, do you know how I can calculate the step angle, or indicate me a reference book, or web site where I find information about this specific area.

I've some pictures of the Hull.

http://i141.photobucket.com/albums/r43/Flysafe_album/Barco%20Fear/barco.jpg

http://i141.photobucket.com/albums/r43/Flysafe_album/Barco%20Fear/Barco17.jpg

http://i141.photobucket.com/albums/r43/Flysafe_album/Barco%20Fear/barco30.jpg

Thanks