Protractor with digital readout

A propeller protractor for measuring the blade angle of the blades thereof including a clamp removably fixed to a table supporting the propeller whose blades are intended to be measured and located at a fixed relationship to the station of that blade, a first pair of spaced rod like elements extending vertically relative to the top surface of said table slidably supported in said clamp, a second pair of spaced rod-like elements extending horizontally relative to said top surface attached to said first pair of spaced rod like elements, and movable vertically but remaining in a predetermined parallel relationship to said top surface, a carriage slidably mounted on said second pair of spaced rod like elements, a sine bar pivotally connected at one end to said carriage adapted to be angularly moved to abut against a surface of the blade to be measured, a shaft angle encoder secured to said carriage and connected to the pivoted end of said sine bar to be rotated thereby, a digital readout electrically connected to said shaft angle encoder being programmed to give a digital representation of the angle relationship of said sine bar and a viewer on said readout recording said readout value.