Rocket projectile with spreadable empennage

Claim 1

A ROCKET PROJECTILE TO BE FIRED FROM A TUBE, COMPRISING A CARRIER SECURED TO THE REAR END OF SAID PROJECTILE, A COMBUSTION CHAMBER LOCATED IN FRONT OF SAID CARRIER, A CYLINDER ARRANGED ON SAID CARRIER PROJECTING INTO SAID COMBUSTION CHAMBER, CONTROL MEANS INCLUDING A PLUNGER SLIDABLY MOUNTED IN SAID CYLINDER, POWER MEANS INCLUDING A PROPELLANT CHARGE IN OPERATION GENERATING PROPULSIVE GASES OPERATIVELY ACTING ON SAID PLUNGER, FINS COUPLED TO SAID PLUNGER MOUNTED ON SAID CARRIER PIVOTALLY ABOUT AXES PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID PROJECTILE, SAID FINS WHEN IN A RETRACTED POSITION EXTENDING PARALLEL TO SAID AXIS AND WHEN IN A SPREAD-OUT POSITION EXTENDING OUTWARDLY AT AN ANGLE TO SAID AXIS, SAID CYLINDER HAVING A FIRST PROPULSIVE GAS DUCT AT A POINT OF ITS CIRCUMFERENCE IN COMMUNICATION WITH SAID COMBUSTION CHAMBER CONTROLLED BY SAID PLUNGER OF SAID CONTROL MEANS IN SAID RETRACTED POSITION OF SAID FINS COUPLED THEREWITH, AND CLEARED BY SAID PLUNGER OF SAID CONTROL MEANS AFTER THE BEGINNING OF THE SPREADING MOVEMENT OF SAID FINS INITIATED BY SAID POWER MEANS IMMEDIATELY AFTER THE LAUNCHING OF SAID ROCKET PROJECTILE FROM SAID TUBE.