Physics 101

In Aprils "Using Ground Effect," I think the author made an inaccurate and misleading statement concerning the aerodynamics of ground effect. The article wrongly asserts Newtons equal and opposite force has different effects when operating close to the ground as opposed to at altitude. He states, "At altitude, of course, theres no reaction between this downward forced air and the wing because theres nothing against which it can react." If this were true, an airplane wing would not be able to fly when at altitude and only achieve lift when close to the ground.

Key Takeaways:

• The primary cause of ground effect is the reduction of induced drag, not a different "equal and opposite force" reaction near the ground compared to at altitude, as air is largely incompressible at subsonic speeds.
• Updating aircraft databases is considered preventative maintenance under FAR Part 43 (specifically Appendix A and FAR 43.9), requiring a logbook entry and signature, a requirement often overlooked by operators.
• Developing fundamental flying skills, such as precise power-off landing techniques and an innate sense of geometry, is crucial for pilots to avoid over-reliance on automation and enhance safety and maneuverability.

Key takeaways sponsored by Aviator Pro | Start Your Training ->

See a mistake? Contact us.