Why Are Manchester United Called the Red Devils?

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Manchester United’s “Red Devils” nickname came from nearby Salford’s rugby league team and was adopted under manager Sir Matt Busby in the 1960s. The connection links two different sports through a shared local nickname. UEFA’s account traces Salford’s name to a French journalist who called the team “Les Diables Rouges” in 1934. That phrase means “the Red Devils.” UEFA says Busby later took a liking to the name. The Premier League’s crest history also credits him with adopting it from Salford. The nickname became a visual part of United’s identity: its badge includes a red devil holding a pitchfork below a three-masted ship. The ship has a separate origin in Manchester’s coat of arms and trading history. A single crest therefore combines a symbol of the city with a nickname borrowed from its sporting neighbourhood.  
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How do Helicopters Fly?

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The helicopter is a very useful and an unusual aircraft, unusual in the sense that it can fly in any direction and hover in mid-air. Invented in 1930s, it is used for all kinds of jobs especially sea and mountain rescue. It can take off and land vertically and can in areas too small for ordinary aircraft. The engine drives the rotor of the helicopter. The blades of the rotor on rotating generate the lift. When a helicopter hovers, the blades rotate at the same pitch. The weight of the craft balances the upward pull of the rotor. To ascend, the angle of attack of the blades is increased. To move forward, the blades are tilted forward. By adjusting the blades, the helicopter can fly in any direction.
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