RE: Measure Right Thrust
Using the prop is certainly the most convenient way. But props very often aren't square to the prop shaft. And they often have their tips cut or cast "in different places".
If you're using the prop, keep in mind that you're not getting really good accuracy. Truth is, you don't need it, but this warning is still worth the time to type it.
Before you rely on the prop, try this:
Block the airplane rigidly, and place a marker that matches up to one of the prop tips. Anything will do, just so long as it and your airplane won't move as you rotate the prop.
I've often shown this trick at the field with a cinderblock as the "immovable pointer".
With the "pointer" rigidly showing where one side of the prop tip is, rotate the prop 180degrees so the other tip comes to the pointer.
Doesn't always come around to the same place the other tip was, does it.