Dual airfoil bladed rotor

Claim 1

A ROTOR COMPRISING: A ROTOR WHEEL, A PLURALITY OF DUAL AIRFOILS EXTENDING RADIALLY FROM SAID ROTOR WHEEL, EACH OF SAID AIRFOILS INCLUDING: A CENTRAL SPAR SECURED TO SAID WHEEL AT ITS INNER END, A PLATFORM ADJACENT THE INNER END OF SAID SPAR ADAPTED TO ABUT PLATFORMS ON ADJACENT SPARS, A FIRST SHEET METAL WRAPPER EMBRACING SAID SPAR AND THE OUTER SURFACE OF SAID PLATFORM TO FORM A FIRST BLADE, A SHROUD SEGMENT INCLUDING: A CLOSED, HOLLOW, TWO-PIECE SHEET METAL BOX WITH FRONT AND REAR FACES, SIDES AND INNER AND OUTER WALLS SECURED TO THE OUTER END OF SAID FIRST BLADE WITH SAID SPAR EXTENDING THROUGH SAID INNER AND OUTER WALLS, MEANS EXTENDING CIRCUMFERENTIALLY FROM SAID BOX ADAPTED TO ABUT ADJACENT BOXES TO SPACE SAID BOXES CIRCUMFERENTIALLY, SAID FRONT AND REAR FACES HAVING INTEGRAL EXTENSIONS ADAPTED TO ABUT ADJACENT FRONT AND REAR FACES RESPECTIVELY TO FORM CONTIGUOUS FRONT AND REAR ANNULAR WALLS WHEREBY SAID SEGMENTS FORM A SHROUD CONNECTING THE TIPS OF SAID FIRST BLADES, AN AXIALLY EXTENDING SEALING LIP ON SAID FRONT ANNULAR WALL, A SECOND SHEET METAL WRAPPER SECURED TO SAID OUTER WALL OF SAID SHROUD SEGMENT AND SAID SPAR TO FORM A SECOND BLADE, INLET MEANS IN SAID SPAR INWARDLY FROM SAID PLATFORM, AN OUTLET IN SAID BOX, AND CONDUIT MEANS IN SAID FIRST BLADE AND SAID BOX EXTENDING BETWEEN SAID INLET MEANS AND SAID OUTLET WHEREBY A PATH FOR THE FLOW OF COOLING AIR THROUGH SAID FIRST BLADE IS ESTABLISHED.