Rotor blade construction for aircraft

Claim 1

AN EXPANSIBLE AND CONTRACTIBLE ROTOR BLADE FOR AN AIRCRAFT COMPRISING, IN COMBINATION, A SUPPORTING MEMBER; A FIRST BLADE SECTION MEMBER MOUNTED ON SAID SUPPORTING MEMBER FOR MOVEMENT BETWEEN A RETRACTED POSITION AND AN ADVANCED POSITION OUTWARDLY PROJECTING FROM SAID SUPPORTING MEMBER; A SECOND BLADE SECTION MEMBER MOUNTED ON SAID FIRST BLADE SECTION MEMBER FOR MOVEMENT BETWEEN A RETRACTED POSITION AND AN ADVANCED POSITION OUTWARDLY PROJECTING FROM SAID FIRST BLADE SECTION MEMBER; FIRST MOVING MEANS MOUNTED ON SAID SUPPORTING MEMBER OR ON SAID FIRST BLADE SECTION MEMBER AND ENGAGING THE OTHER OF SAID MEMBERS FOR MOVING, WHEN ACTUATED SAID FIRST BLADE SECTION MEMBER RELATIVE TO SAID SUPPORTING MEMBER BETWEEN RETRACTED AND ADVANCED POSITIONS; SECOND MOVING MEANS MOUNTED ON SAID FIRST BLADE SECTION MEMBER OR SAID SECOND BLADE SECTION MEMBER AND ENGAGING THE OTHER OF SAID MEMBERS FOR MOVING, WHEN ACTUATED, SAID SECOND BLADE SECTION MEMBER RELATIVE TO SAID FIRST BLADE SECTION MEMBER BETWEEN RETRACTED AND ADVANCED POSITIONS; AND CENTRAL ACTUATING MEANS FOR SIMULTANEOUSLY ACTUATING SAID FIRST AND SECOND MOVING MEANS FOR MOVING SAID SECOND BLADE SECTION MEMBER FROM ADVANCED POSITION INTO RETRACTED POSITION AND MOVING SAID FIRST BLADE SECTION MEMBER RELATIVE TO SAID SUPPORTING MEMBER FROM ADVANCED TO RETRACTED POSITION AND MOVING SAID FIRST BLADE SECTION MEMMEMBERS FROM THEIR RETRACTED INTO THEIR ADVANCED POSITIONS, WHEREBY ANY EXPANSION OR CONTRACTION OF THE ROTOR BLADE IS ATTAINED WITH RELATIVELY SLOWLY MOVING MEANS AT A RELATIVELY GREAT SPEED AND WITHOUT SUBSTANTIALLY CHANGING DURING SUCH MOVEMENT THE GENERAL CONFIGURATION OF SAID ROTOR BLADE.