I learned about thrust angles and wing incidence the typical way in the field . A very simple blus max high wing easy to fly sunfay flyer .It had down thrust build into the firewall . So while flying around I was wondering why I am fighting to keep this plane level and all it wanted to do was clime out of sight .Ok , maybe it needed more down thrust so , we added washers to the top two engine brackets , nope still climed , ok maybe the wing that was designed and set at the factory on a set position on the fuse was wrong ???? Himmm so I added in test increment 1/4 balsa pieces to the fuse where the wing was touching the fuse ---wala , perfact hands off flying .
That plane was a great teaching tool to 1)check every angle , every measurment , take wing foil configaration into effect and you will spend so many more hours at the field simply flying .
I went out and bought a wing incidence meter from GP , I check every surface , I also now measure the firewall for thrust angles , note what you find so if you see really negative habbist at the field you know where your plane well enought to tell someone at the field " he do you think it needs right thrust ect ect "