I am trying to estimate airload on a cylindrical door panel using
the Drag Equation (D = q * Cd * A). I am designing a drive system
to move the door forward and aft (in direction of airflow) and need to
account for the force exerted by the airstream.

The door axis is at an angle to the airstream (angle of
attack). My references give a Cd of 1.17 for airflow normal to a
cylinder but I'm not sure how to account for an angle other than
normal. Can I use 1.17 and the frontal area (projected) for the
cylinder?

Haven't calculated Re, but airspeed = 300 kt. Thanks for any advice.

1## Re: Aero drag on cylinder shape