In what area should rib lacing be spaced closer together?

Rib lacing should be spaced closer together in the propeller wash area because this region experiences increased aerodynamic forces and turbulence due to the airflow generated by the rotating propeller. The propeller wash can cause significant variations in pressure and forces on the aircraft structure, which necessitates additional reinforcement to maintain the integrity of the fabric covering. By spacing the rib lacing more closely in this area, the covering is better supported, ensuring that it can withstand the enhanced stresses and maintain a smooth, aerodynamic surface. This practice improves durability and helps prevent fabric failure in locations where it is most susceptible to the dynamic loads created by the propeller’s effects.