Abstract: The present aircraft steering method makes use of additional lift gained by ontrolling the separating of vortical flows from the leading edges of the wings for the purpose of controlling the aircraft about its pitch axis, its roll axis, and its yaw axis. The vortical flows are selectively or differentially separated from the leading edge of the wings by raising or lowering leading edge flaps and/or blowing a flowing medium over the wing surfaces substantially in parallel to the leading edge.

Abstract: A prefabricated outer wall element for the construction of buildings, which element comprises a radiator disposed on the inner side thereof, a flat solar radiation collector disposed on the outer side thereof, and a heat accumulator disposed within the wall element between the radiator and the solar collector. First communicating means are provided for forming a first circuit for a heat carrier between the collector and the heat accumulator in order to store the heat received by the collector, and second communicating means are provided for forming a second circuit for the heat carrier between the heat accumulator and the radiator in order that the heat received by the collector and stored in the accumulator may be supplied to the radiator with a certain time-lag.

Abstract: The present canard type of aircraft comprises steering rudder elements which are tiltable substantially about the leading edge of each wing of the aircraft, whereby the respective edge of the rudder element extends alongside said leading edge of the respective wing. Another edge of the rudder element extends alongside a surface portion of the fuselage or body of the aircraft in close conformity with said surface portion, but movable relative thereto. A sealing may be inserted between the rudder element and the fuselage in such a manner that said movement is permitted.