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Old June 28th, 2014, 05:25 PM   #1
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Runway configuration for wind direction...

Runway configuration for wind direction...

I've always wondered why the majority of large airports (loads in the US and across continental Europe) have runways in several directions rather than just parallel ones. I know that jet aircraft are meant to take off into the wind as much as poss, but in England, all the cross wind landing runways have been removed...

Heathrow and Manchester only have parallel runways, and all the proposals for new runways in England are also for parallel runways only. Heathrow did used to have a diagonal one which was removed about 2002?

Are these none parallel runways actually needed? Surely they just reduce efficiency?


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Old June 29th, 2014, 04:00 PM   #2
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Modern jet aircrafts were designed to handle up to >20knots in crosswind. New airports generally didnt cater for small change in direction as the effectiveness of cross runways is generally lower than parallel ones.
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Old June 29th, 2014, 10:59 PM   #3
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If you look at a lot of big US airports, they have all parallel runway configurations. Think ATL, LAX, etc. ORD, pictured above, is in the middle of a huge reconfiguration that will reduce it's number of crosswind runways, and leave it will more parallel runways.

The airports with lots of crosswind runways tend to be older, and had the crosswinders to accommodate older aircraft that had less tolerance for crosswinds. Most of the newer airports, especially in Europe, are parallel designs (MUC, ATH, CDG although not that new)
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