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Efficiency, thrust/drag with regard to hovering |
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April 21, 2010, 01:51
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Efficiency, thrust/drag with regard to hovering
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Senior Member
TWB
Join Date: Mar 2009
Posts: 414
Rep Power: 19  |
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! |
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