CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   Efficiency, thrust/drag with regard to hovering (http://www.cfd-online.com/Forums/main/75270-efficiency-thrust-drag-regard-hovering.html)

quarkz April 21, 2010 00:51

Efficiency, thrust/drag with regard to hovering
 
Hi,

I'm used to computing thrust, lift and efficiency for an airfoil moving in a uniform stream.

Efficiency, as in propulsive efficiency is defined as:

thrust/power input

However, in a hovering case, the body is not moving.

So, what does thrust or drag mean? Must it be zero since the body is not moving?

How is efficiency defined in this case?

Thanks!


All times are GMT -4. The time now is 13:00.