Not to mention what I believe in trying to accurately measure EXACTLY 0.25 instead of 0.5 ... and I guess I've got the same instruments as you guys.
Come on... it's about 0.5deg. or +0.25wing/-0.25 stab. Yeap about 0.5.... or maybe it was 0.42?
Yes, accurately measuring an angle of 0.5 degrees is difficult.
However, 0.5 degrees equates to approx. 3.9 mm (i.e. 4 mm) height difference, measured over a chord length of 450mm, which is quite typical for a 2m pattern model. So if you draw a center line, you can measure the distance down from this line at the leading edge and the trailing edge. When the difference is 4mm, you have 0.5 deg. INSTALLATION ANGLE relative to this line.
(sin 0.5x450=3.9)
(Incidence = angle of attack, and for a given aeroplane this will only be (weight and) speed dependant for level flight. For an electric model, it will only be speed dependant, as weight is constant.)
Magne