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The mistake is in not realizing that the air that the propeller acts upon is
unchanged regardless of the speed of the conveyor belt. Therefore, the propeller will be able to pull the airframe forward on the conveyor regardless of how fast the conveyor moves, because it is putting a force on the airframe relative to the air, not relative to the conveyor belt. The same thing would happen if you attached a rope to the nose of the airplane and stood on the ground ahead of the conveyor so that you were not standing on the moving belt. Start the conveyor and the airplane stands still while the wheels spin with the conveyor belt. Now pull on the rope and you can move the airplane forward even though the conveyor is moving backwards and the wheels are spinning like crazy. The mistake I made in comparing it to a seaplane on a river is that the floats are attached to the airframe - where they go, the plane goes. No so with wheels. Wheel rotational speed has nothing to do with how fast the airframe moves in this scenario. BDS |
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