Lofting is fairly simple geometry once you understand what the plans are showing. It is mostly a matter of measuring a distance, rotating it 90 degrees, and placing it on the proper line on a grid and then connecting the dots.
The difficult part is that it must be done over and over and over and over and over and.............
It is easier to write possible options and suggestions as orders and as something orthodox. The verbs etc. are easier to do.
Are you doing POF - for to display the frames?
If so: the plans show singleton frames. You don't want it! Either half the sided dimension of each frame and make a bend of it or slide two frames together to make a bend. If you build with each frame timber only held together by an end grain to end grain bond? It will be constant frustration and heartache when many or most of the bonds fail as you shape them.
An alternative to what Underhill shows is the consider all of the stylized framing options in use and choose one of them.
Are you going to plank the whole hull?
Go with WL lamination half hull hollow interior carved then joined P&S.
If you intend to paint the swimming body:
add planking thickness to the carve pattern and skip the whole planking part.
I like this reply.. in a way.
Liked his explanation of lofting.. and over and over... yep.. one for each frame(s). Patience one of the hardest things.
First, all Underhill ever did was POF (Plank on Frame). And he thought it was not something limited to "super-men" (Pg. 3 middle).
Some Questions are asked
" Are you doing POF - for to display the frames?" Underhill did not, but this could be done if desired.
"Singleton Frames" well for the cant frames yes.. for the rest they are made as square frames per the drawing. He does not speak of frustration..
"Are you going to plank the whole hull" Well yes, could be, or not.
"Go with WL (Water Line) lamination. THIS is a viable way to go and hollowing out the center and run carlings for the interior. A sturdy, accurate and tried way to go.
As to Planking... that is all part of the fun of doing this. One could scribe the planking on a smooth hull and this was done in the early modeling days.. including the painting of each of the frames in a styleized way.
I just received a book " Ship Models, Their purpose an development from 1650 to the present", Brian Lavery, Simon Stephens" A fascinating study of why models were made.. Using the laminated WL method is one of the oldest. The oldest being a carved block (not so accurate and painful to make..more so than a POF in my opinion".
I have been "thinking" of doing this for years.. now to get off my butt..
Guy