I am currently reading this very interesting book, which explains -I guess- most of the things you need to know in order to design aircraft. Yet it is not clear to me besides the payload size what other factors are precisely used in order to determine the exact shape and size of the fuselage. I know that aerodynamics are considered, but that's very broad...
I read that the conic lofting method is usually used to determine the exact shape of the fuselage. But I would need some more explanation to get a better understanding of how this is determined. In other words: I know my wing size, airfoil, payload size and would like to design the fuselage. How should I proceed?
EDIT: Feel free to share the pragmatic approach
What bothers me is that I ended up finding a webpage with some interesting guidelines, but contains many constant values I have no I idea where they cone from: http://www.barnardmicrosystems.com/UAV/uav_design/guidelines.html
eg of such values: wingspan: 1.041, 0.382; step 3 length: 1.775