>>The over all width of >>the boat is not to be confused with hull center lines which is actually where >>the rubber hits the road. > >What is the correct way to describe to distance between the center >line of the hulls? There must be a specific term to set that >measurement apart from the more common "beam." We call that dimension the centreline to centreline beam, or CL-CL. In the interests of simplicity when setting the boat up, we usually set that at a nice even number and let the overall beam be what it may.More or less, as long as it does not exceed whatever is the desired BOA [beam over all]. Regards, Malcolm Tennant. Malcolm Tennant Multihull Design Ltd PO Box 60513 Titirangi, Auckland 1007 NEW ZEALAND ph +64 9 817 1988 fax +64 9 817 6080 e-mail malcolm@tennantdesign.co.nz www.tennantdesign.co.nz www.catdesigners.com