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How does the body-fixed coordinate system look like?
Mostly through the center of gravity.
The x-axis points into longitudinal direction, while the y-axis is normal to that, pointing upward or downward
The total aerodynamic force F_aero consists of which two parts?
-total force due to pressure
-total force due to shear (friction)
In which two components can F_aero be split up to? (in aerodynamic coordinate system)
into lift and drag
What forces produce lift?
Lift is mainly produced due to pressure, which is acting on the body
What produces drag?
Drag is due to pressure and friction acting onto the body
How does the aerodynamic coordinate system look like?
It is defined in relation to the incoming flow. The x-axis is in the direction to the incoming flow, the y-axis is normal to that.
Which four forces are acting onto an aircraft?
-lift (normal to airstream)
-drag (parallel to airstream)
-thrust (usually slighty inclined towards the aircraft reference axix)
-mass forces (weight + inertia forces)
How is lift generated?
Lift is generated by re-directing the airstream:
By accelerating the flow on the upper side and decelerating the flow on the lower side
How is drag generated? (generally)
Drag is generated by declerating (slowing down) the airstream
How does the pressure distribution of an airfoil look like?
upper side: low pressure
bottom surface: high pressure
What can one tell from the cp- curves?
The larger the area they enclose, the higher the pressure force and the higher the lift
What is the camber line?
the line where upper and lower surface has the same distance
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