(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I've been trying to find a simple equation for calculating the lift (or thrust) of a RC helicopter and i've found a few that are different.

2. Relevant equations

1) Lift = circular area swept by rotor blades [itex]\times[/itex] density of air [itex]\times[/itex] velocity of air exiting disk [itex]\times[/itex] velocity of air exiting disk

2) Thrust = 2 [itex]\times[/itex] air density [itex]\times[/itex] length of rotor blades^{2}[itex]\times[/itex] induced velocity

3. The attempt at a solution

I am unsure which is the correct equation. Also, can someone explain what 'induced velocity' is please?

thanks!

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# Calculating helicopter lift

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