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**Calculating necessary Power to generate required Thrust**

Hello,

This is my first post on this site and I hope someone can help. I am building an experimental air vehicle for my final dissertation in my Transport Engineering degree course. I am trying to track down a formula I need but cant figure it out, and am tearing my hair out !!

I need to calculate the combustion engine size (hp) necessary to:

Lift a given weight vertically off the ground, when driving a propeller of fixed given pitch and given diameter, running at a given rpm, for a given drag co-efficient. Assuming air density and altitude to be at sea level.

Can anyone please help,

Thankyou very much in advance. :)

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