Mil Mi-35 Hind Multipurpose Attack Helicopter

The Mi-24, Mi-25/35 « Hind » multipurpose combat helicopters are intended for destruction of armoured vehicles; low-speed air targets; enemy manpower; fire-support of land forces; delivery of technical troops; evacuation of the wounded; as well as for transporting some special-purpose loads. Watch – you can listen to the comments only after 1’34 » of this video:

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Sea King helicopter blade

Sea King helicopter blade cutaway view
Rotary-wing blade - Figure 1-17 © www.tpub.com

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

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X3 concept – experimental compound helicopter

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:

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NASA flying Puffin – Personal aircraft

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How a jet engine works

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