How It Works

A windscreen is a rigid screen placed behind the rear seat of a convertible to prevent turbulence in the cockpit when driving with the top-down.

Normally, as you drive with no windscreen in place, high pressure air flows over the hood and top of the car, landing upon the rear.  A low pressure air forms in the cockpit.  The wind pressure then equalizes, by moving from rear to front.  This is why, when people drive with the top-down, their hair actually blows back-to-front, instead of the hair blowing backwards.

A windscreen breaks up this air flow, redirecting or breaking the wind pattern apart.

(Images are taken from oris-dmbh.de)

(Images are taken from ultimatemg.com)

(Images are taken from windbaffle.com)