HELICOPTER FRIGHT HATCH Russian patent published in 2004 - IPC

FIELD: aviation materiel, applicable as a device for loading (unloading or rolling-in of freights.

SUBSTANCE: the freight hatch has an opening, ramp hinge-joined to the threshold of the freight cabin, drive for its deflection including two hydraulic cylinders with butt joint assemblies at the ends. The butt joint assemblies connect one end of the hydraulic cylinder to the ramp, and the other - to the fuselage frame. The hydraulic cylinders are positioned in recesses formed under the freight cabin flooring and closed by detachable covers. The outer skin has aerodynamic by-passes, which at a closed hatch are smoothly conjugate to the fuselage surface making up a single aerodynamic configuration. Supports are installed at the end of the ramp between the longitudinal beams and the spars in the zone of passage of the wheels of the rolled-in equipment, and a plate for engagement of the ramp with the ground at an open hatch - in the axis of symmetry. The length of the ramp is selected proceeding from the condition of formation of the width of the ramp end section in the line of conjugation to the fuselage surface not less than the width of the wheel passage of the rolled-in equipment. The ramp end section is made with a run-over formed by two inclined surfaces successively turning at an angle to each other from the ramp end to the surface of the inner skin.

EFFECT: expanded operating potentialities of the freight hatch and improved aerodynamic characteristics of the helicopter fuselage.

7 cl, 7 dwg