In the youtube video below Paul Bertorelli states at 4.07 that a Cirrus with parachute deployed descends at a rate of 1700 fpm but will have a lower rate of descent if there is a wind.
Can someone explain that? To me the aircraft has no form of control with the parachute deployed as the indicated airspeed will be zero in a constant wind however strong and there is no way of harnessing the wind strength to form lift.