The correct dihedral angle of wings can be determined by using?

The correct dihedral angle of wings is most accurately determined using a dihedral board and a bubble level along the front spar. This method allows for precise measurement of the angle at which the wings are set relative to the aircraft's horizontal plane.

A dihedral board is a flat surface specifically designed to aid in achieving accurate angling of wings during assembly, while the bubble level provides a clear indication of whether the wings are vertical or at the desired dihedral angle. This combination ensures that the measurement accounts for any tilt or imperfections in the assembly process, leading to a well-aligned and stable aircraft.

Other methods, such as visual inspection techniques, might not provide the level of accuracy needed for proper wing alignment, as human error can lead to subjective interpretations of the angle. The use of a spirit level and ruler can also be less precise, as it may not adequately account for the three-dimensional complexities and the specific reference points required for an aircraft's wing structure. While computer-aided design tools can facilitate the design process, they are typically not used for on-site physical measurements of dihedral angles.