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HELP! How do you calculate the force of wind pushing downwards on a rigid surface

Wile E's wearing a cape and running off a cliff. Assuming that the cape is right and at an angle, and that the velocity of air hitting the coyote is 17.7778 m/s, how do i calculate the lift?

Reply 1

uberteknik

Original post by 55boooooo55

Wile E's wearing a cape and running off a cliff. Assuming that the cape is right and at an angle, and that the velocity of air hitting the coyote is 17.7778 m/s, how do i calculate the lift?

Hello and welcome to TSR. :smile:

The question as stated is way too ambiguous and does not make sense. You ask for the lift acting on a parachute, but also state you want the force of 'wind' pushing down on a rigid surface?

What are the drag & lift coefficients for the parachute/surface?

What is the surface area of the parachute/surface?

What is the shape of the parachute/surface: an aerofoil shape or round etc?

What is the angle of attack of the airflow over the parachute/surface?

What is the air density at the height the lift is to be calculated?

F_L = \frac{\rho AC_LV^2cos^2\theta}{2}

F_D = \frac{\rho AC_DV^2cos^2\theta}{2}

Unparseable latex formula:

C_L \mathrm{& \ }C_D

= lift and drag coefficients respectively

\rho

= air density at altitude

V

= air speed

A

= surface area

\theta

= angle of attack referenced between the relative wind direction and the chord line parallel to the plane of the lifting surface.

(edited 9 years ago)

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