Nozzles for discharge of compressible fluid

Claim 1

A NOZZLE FOR THE DISCHARGE OF A COMPRESSIBLE FLUID INTO AN AMBIENT ATMOSPHERE, COMPRISING AN OUTER WALL ENCLOSING A DUCT WITH AN OPEN DISCHARGE END, AND AT LEAST ONE VANE WHICH PROJECTS INTO THE DUCT FROM THE OUTER WALL; EACH VANE HAVING TWO FLANKS EACH TERMINATING DOWNSTREAM AT A TRAILING EDGE SPACED UPSTREAM FROM THE OPEN DISCHARGE END OF THE DUCT, AND A BASE WALL LYING BETWEEN THE TWO TRAILING EDGES AND FACING IN THE DOWNSTREAM DIRECTION; THE TRAILING EDGES BEING ON MEMBERS WHICH ARE MOVABLE RELATIVELY TO ONE ANOTHER TO VARY THE DISTANCE APART OF THE TRAILING EDGES, AND THE BASE WALL INCLUDING EXPANDABLE AND CONTRACTIBLE MEANS OPERABLE IN COORDINATION WITH THE RELATIVE MOVEMENT OF THE MEMBERS FOR SUBSTANTIALLY CLOSING THE SPACE BETWEEN THE TRAILING EDGES AND THE VANES; THE SYSTEM HAVING A STATIC PRESSURE HIGHER THAN AMBIENT ATMOSPHERIC PRESSURE.