Check out the article written by Chief Instructor Sean Koomen and Instructor Emeritus Jeff Hammond on the Prothero Method in the March/April 2016 WoodenBoat Magazine.
Boatbuilder Bob Prothero, founder of Northwest School of Wooden Boatbuilding, championed an efficient method of boatbuilding that relied on extreme accuracy in the lofting. One element of this method—and a signature method in West Coast boatbuilding—is the bending of frames to the outsides, rather than the insides, of the ribbands, as on this 36′ Carl Chamberlain-designed motorsailer…. ~Sean Koomen, “Efficiency, Accuracy, and Integrity: The elements of the Prothero method,” WoodenBoat No. 249 March/April 2016