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What is drag and lift in aerodynamics?
Lift is defined as the component of the aerodynamic force that is perpendicular to the flow direction, and drag is the component that is parallel to the flow direction.
What type of drag comes from lift?
In aerodynamics, lift-induced drag, induced drag, vortex drag, or sometimes drag due to lift, is an aerodynamic drag force that occurs whenever a moving object redirects the airflow coming at it.
For what purpose do we find drag and lift coefficients?
The lift/drag ratio is used to express the relation between lift and drag and is determined by dividing the lift coefficient by the drag coefficient, CL/CD. A ratio of L/D indicates airfoil efficiency. Aircraft with higher L/D ratios are more efficient than those with lower L/D ratios.
What is aerodynamic drag coefficient?
The aerodynamic drag coefficient is a measure of the effectiveness of a streamline aerodynamic body shape in reducing the air resistance to the forward motion of a vehicle.
Which is the correct definition of lift and drag?
There is a general convention to define lift and drag according to the direction of the free-stream: Lift is the part of the force perpendicular to the direction of the free-stream, with positive lift pointing upwards, and
Which is the best book on fluid dynamic drag?
While a bit dated with respect to modern transport aircraft, Fluid Dynamic Drag and Fluid Dynamic Lift by S. Hoerner has a ton of data on just about every aspect of interest. Thanks for contributing an answer to Aviation Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid …
Is the 777 drag polars provable or provable?
It’s a text book and as such not quite freely available, but Obert‘s Aerodynamic Design of Transport Aircraft has a lot of surprisingly accurate data (including e.g. 777 drag polars). Another source: Modelled from independent analysis and maybe not necessarily provable, but there’s some detailed estimates on 787 characteristics published here.