Re: Airliners takeoff and landing distances

From:         jeff344@voodoo.lerc.nasa.gov (Jeff Berton)
Date:         13 Apr 94 19:17:09 PDT
References:   1
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In article <airliners.1994.1131@orchard.Chicago.COM>, you write:

> BTW, there is no economic benefit to using less runway than is available at
> La Guardia. 

Indeed, there are noise reduction advantages to using as much runway as
possible.  With a delayed rotation, the noise at both the sideline and
community measuring points can be reduced by 1 to 3 EPNdB, depending on the
aircraft configuration.  With a higher rotation velocity, 

- The rate of climb is better, which allows the plane to pass over the noise
  observers at a higher altitude,
- The speed is greater, which allows the plane to get past the observers 
  more quickly and reduce the duration of the effective perceived noise level,
- And since the speed is greater, forward velocity jet attenuation becomes
  more effective.
-- 
Jeff Berton, Aeropropulsion Analysis Office, NASA Lewis Research Center
jeff344@voodoo.lerc.nasa.gov