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 Beriev Be-2500 Neptune is a super-heavy transport seaplane proposed by the Beriev Aircraft Company of Russia. Its maximum take-off weight should reach 2,500 tons! It would be the largest aircraft ever proposed. It might weigh four times more than the largest aircraft in the world, the Antonov An-225.
This gigantic project would range from $10 to $15 billion. The Be-2500 would be a “flying ship” able to compete with the maritime shipping and air transport industries. Its size is not clearly quoted due to a discrepancy in the figures available. However, it would nearly double the Airbus A380 size!
It is deemed to be an ekranoplane (also known as a “wing-in-ground-effect – WIG”, “flarecraft”, “wing-in-surface-effect ship – WISE”, “sea skimmer”, “ground effect vehicle – GEV” thanks to its cushion of high-pressure air provided by the aerodynamic interaction between the wings and the surface, which is known as ground effect.
Last but not least, it could fly far over the surface (airborne) like any heavy cargo. Watch what it could look below: