I have been meaning to show this to U guys for a while.

This app allows ur Iphone to measure inclinations within fractions of a degree and is handy for throws and incidence. Works like a charm, with tighter tolerances than typical protractor arrangements. My favorite mode (of several available) is the digitally calibrated bubble level.

U can review it here [link=http://www.ihandysoft.com/carpenter/]Iphone level[/link] . AND IT'S FREE (!!!!!) which makes it the best deal ur EVER gonna see in the jet hobby

Enjoy, Don.