Moving Sale wrote:I still want to know if a plane takes into account the earth's curve when it is flying.
This seems to be a silly question, and I guess one would have to define what is meant by "takes into account." We also have to make the subtle distinction between
level and
straight when using those terms together in the context of this discussion. If a plane flying over any appreciable distance is maintaining a
level altitude, it's path is curved. I'm no pilot, but I'm guessing there is little to no "effort" involved in maintaining a constant altitude to "account for" the earth's curvature - gravity & centripetal force will take care of that. A greater amount of effort would be required to overcome those forces and fly in a straight line because the aircraft would have to climb at a constant rate, since if it is flying in a truly
straight line, it will be gaining altitude until it reaches one that can no longer be aerodynamically sustained. If a boat is sailing from California to Hawaii, it's path along the ocean is curved, and zero effort is needed for that to occur since we don't have to factor in lift. In both cases, the curvature being followed will be imperceptible and the vessels will appear to passengers and observers to be following straight paths.