A "Smart level" is a tool of choice. It gives you digital read out and is
accurate to 1/10th of a degree.

J.P.
"Stealth Pilot" wrote in message
...
On 23 Apr 2006 22:07:40 -0700, wrote:

What tool or methods do you use to measure flap angles to a datum?

go down to the best hardware store you can find and locate a
carpenter's compound square set. it is the one with the square, the
ruler and the angle doohicky all in one.(two bits that slide along the
ruler) the angle thing has a bubble in it for reference to horizontal.
you discard all the bits except for that bubble angle measurer. it is
more than sufficiently accurate for doing control surfaces.

Stealth Pilot