The Lockheed Martin P-791 – say « Pi-seven-ninety-one » – is a hybrid air vehicle as she is an actual multirole aircraft. She can be an aerostatic, aerodynamic, manned, unmanned, cargo, all-terrain and ISR (Intelligence Surveillance and Reconnaissance) airship as shown in the video below:
The main rotor or rotary wing on the H-3 has five identical wing blades. Other helicopters may have two, three, or four blades. A typical wing blade is shown in figure 1-17. The rotary-wing blade is made of aluminum alloy, except the steel cuff by which the blade attaches to the rotor hub. The main supporting member of the blade is a hollow, aluminum alloy extruded spar, which forms the leading edge. The steel cuff is bolted to the root end of the spar. Twenty-three individual pockets constructed of aluminum ribs, aluminum channels, and aluminum skin covering are bonded to the aft edge of the spar.
Text and cutaway view: www.tpub.com courtesy
The Eurocopter X3 concept is a High-speed long-range Hybrid Helicopter (H3 concept) which flies up to 220 knots or 410 km/h. Special thanks to Xavier – http://passiondesavions.blogspot.com webmaster – who stumbled upon this French-subtitled video: