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i'm doing a physics lab paper helicopters and changing the length of their wings.

i was wondering if i could find the coefficient of drag for each helicopter.

i have the mass of the helicopter, the time it takes to fall a certain distance and i'm assuming that the cross sectional area will be pi*length^2

however, i'm having a bit of trouble determining the force of drag, i am not sure at all how to go about it :S

how do you calculate the force of drag? thanks