Rules of thumb for UAV power requirements (by weight and speed)?

Hi all,

I'm looking into design requirements and am wondering if there are any common rules of thumb for the power requirements of a UAV by weight and/or speed?

For a specific example of the question: how much power is required to support a 10lb UAV hovering vs. travelling at 20mph?  

I'm trying to figure out how big of a battery I need for different weight and speed specifications.  I imagine this is all related to the lift generated by the rotors but I'm not sure how to derive the power requirements myself.

Thanks for any help!

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Heres a good place to start http://www.ecalc.ch/

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