How can the dihedral angle of a wing be precisely measured?

The ability to measure the dihedral angle of a wing accurately is critical for ensuring proper handling characteristics and stability of an aircraft. Using a straightedge and a level protractor placed on the front spar provides a straightforward and effective method for such measurements. This approach allows for precise alignment with the wing's structure while ensuring the protractor is level, thus giving an accurate reading of the angle relative to the horizontal plane.

The use of a straightedge ensures a solid reference line, while the level protractor directly measures the angle formed between this line and the wing's plane. This method minimizes errors that can arise from judgment or visual assessments, making it reliable for critical aircraft measurements.

Other methods, although potentially useful, may lack the precision or reliability necessary for accurate dihedral angle assessments. For instance, laser alignment tools could also provide an accurate measurement, but they require a higher level of setup and could be influenced by external factors, making the simpler method of a straightedge and level protractor often preferred. Flexible rulers or visual symmetry assessments introduce variability and subjective interpretation, which can lead to inaccuracies in dihedral angle measurement.