Wide chord
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A wide chord fan engine is a term to describe the big fan in the inlet of a modern jet engine. In aviation terms, the meaning of "chord" is the line from the front (leading egde) of an aerofoil to the rear (trailing egde).
A fan on a jet engine is a number of aerofoils mounted at the rotational center on the fandisc, and as the engine core rotates the fanblades accelerate an airmass and create the force to move forward which gives thrust. Today about 60-80 percent of thrust from a fan jet engine is created from the fan.
In theory the larger the fan diameter (the line from the tip of one fanblade to its opposite member) the greater the thrust. In real life the fansize is limited by the fact that only a certan amount of space is available around the aircraft, and also the larger frontal aera creates drag (resistance) at high speeds. The engineer therefore has to move other ways in order to design higher thrust rateings, and one way of doing this, is to increase the chordline (making the chord wider). By doing this the effectiveness of one fanblade becomes greater. Therefore a wide chord fan enigne have less numbers of fanblades, but each fanblade is greater in size an effectiveness. This also allows for lower tipspeeds which means less noise.
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