Chord:the line joining the leading edge and the trailing edge of the wing
Centre of Pressure: a point within the wing the forces of Lift and drag are thought of as acting on.
Centre of Gravity: the point of balance of the craft
Aerodynamic Load: the total load of the craft supported by the wing. (All-up weight plus thrust).
Aerodynamic resultant: the force that opposes the load. (Lift plus drag).
Thrust: the force that pushes you forwards. Made up of motor thrust minus drag from the pilot
Weight: the all up weight of the craft and pilot.
Drag: the force that pulls you back. Resistance of the air you are pushing out of your way.
Angle of Attack: The angle between the chord and the trajectory.
The aerodynamic load and the aerodynamic resultant are equal and opposite when you are travelling along a straight trajectory at a steady speed. The red arrows are equal and opposite along the line of resolution that joins the CoG and the CoP
When you turn off the thrust the only force left to oppose the Aerodynamic resultant is the Weight
Increase the Thrust to more than the drag and you start to climb. The more you Thrust the steeper you climb (up to a point!)
