Plane Mathematics

by Michael Fisher
(Glasgow, Scotland)

Probably like many others I have been hunting for answers to questions that I can't answer.

Don't get me wrong. I'm not an aeronautical engineer or an expert in plane design. I am just a relative beginner.

I've hunted unsuccessfully for answers to these questions:

1) What is the "neutral line" of an airframe?
2) How do we calculate the "neutral line" if we are designing an airframe from scratch?
3) How are a plane's 'best' motor offsets calculated for any particular airframe?
4) How is a wing's best (?) "angle of incidence" calculated for any particular design of airframe?

Of course, by trial and error we can spend heaps of money and trash many models to get somewhere near the answers. I dunno about you but I prefer not to.

What I'm seeking are reasonable ways of designing on the drawing board and working backwards to establish those points with an existing model.

Has anyone out there got a clue about answering those critical questions with mathematics and physics (engineering) or is everyone using the trial and error approach?

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