The four aerodynamic forces at play on a model are lift, drag, thrust and gravity.
1. Lift ?The result of airflow over the curved upper and lower wing surfaces. It is the force that keeps the model in the air.
2. Gravity - This is the force exerted on the model that pulls it down.
3. Thrust - Thrust pushes or pulls the model forward.
4. Drag - the opposite of thrust, drag is created by the friction of model against the air as it moves forward.
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