Basic Theories of Aeronautics: An introduction to using Simple Mathematics and Physics to design aeroplanes
Basic science of the principles of flight, covers using relatively simple maths and physics to scope the required parameters to begin to design and build a simple aeroplane. This is a free form text version, a later better version (lower price) with much better graphic/math layout can be be found : please search ASIN: B07HDP3H8Y.