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What is the total lift equation of a helicopter with 3 Flettner rotors?

Interesting technical idea, at least by a theoretical point of view. To distinguish the spinning of the cilinder around its own axis from its rotation around the hub, let's call the former $\omega_{...
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1 vote

Why does lift coefficient not change with velocity in inviscid flow?

I guess we should start with saying that over many orders of magnitude of Reynolds number, it would be likely that the coefficient of lift would in fact change. This is why insects, birds, and ...
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0 votes

Why does the leading edge vortex accelerate the flow downward?

How about it doesn't! The bound vortex does not accelerate the flow down, in 3D flow around a wing, it is the wing tip vortices that are responsible for the accelerated flow downward [1], and that ...
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1 vote

How to choose an attack angle?

This is a rather simple question if you look at it from a slightly different angle, mind the pun. If we assume cruise condition, that equates to straight and level flight. Here you know that: $$ L = W ...
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1 vote

What are some features of a wing, which effects its lift coefficient other than its sectional view?

Anhedral and dihedral have an effect by causing the vector of lift to be at a slight angle, inward (dihedral) or outward (anhedral). This would also have an effect on induced drag, as do winglets. As ...
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0 votes

How do I calculate the center of lift?

The Centre of Lift (CoL) of the whole aeroplane is a summation of the lift forces of the wing, the fuselage and the horizontal stabiliser. The wing has the largest contribution to the lift of course. ...
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0 votes

How do I calculate the center of lift?

In the air, in steady state flight at a given airspeed, the 4 forces of flight are in balance. Therefor, it might be easier to work this backwards. for zero pitching moment the center of all lifting ...
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