Discussion in 'General Topics' started by RDoug, Oct 12, 2017.
NASA reveals radical new flexible wingflaps that can cut plane landing and takeoff noise by 30%
What's all the flap about with wind noise?
Don't the engines make the loudest noise?
Any two masses of air with different qualities meeting each other create noise.
Why would I want to do a thing like that?
I thought passengers enjoyed the sound blasting for takeoff....no??
Depends on the passenger as I'm sure some are on their second or third flight of the day and might be trying to nod off if they haven't already. The less noise the plane makes the less restrictions communities will likely put on nearby airports and it'll be less difficult to expand current airports or build new airports with less whiney locals bitching about noise.
It also sounds like it has some promise for improving fuel economy which is pretty interesting. I know some planes have a 'negative' or reflexed flap setting to decrease drag in cruise. I believe some Pipistrels use it, but I'm not sure if there's much of an application for commercial airliners.
I wonder how it affects performance.
Maules have a negative flap setting for cruise.
I'm not sure it makes the plane fly any better though...
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I know this is probably sarcastic, but I live under the approach path for the airport they are testing the MRJ. A few months ago they were doing tests for flap flutter at insanely fast airspeeds. I actually thought it was a flight of F-18's that occasionally visit doing a highspeed pass. Most of the noise was airframe noise.
It didn’t do anything for making the flying characteristics “better”, but it does give a little more speed.
At best you may get 5-7 knots in cruise. We called it the hyperspace setting.
That GLF has been thru a lot.
It should see someone. Schizophrenic as hell.
I do find the notion of testing quiet flaps on a straight-pipe Gulfstream fairly hilarious. "THE DECIBEL METER CONFIRMS OUR HYPOTHESIS, SIR!" "WHAT????"
Yeah. I doubt he’s being sarcastic.
Spey engines are like radials, if there isn't at least a few drops of oil under them someone needs to check if there's any oil in it. Changing those engines isn't particularly difficult but it is one of dirtiest jobs on an old Gulfstream. Carbon from the generator brushes mixes with turbine oil and gets everywhere, and you have to take everywhere apart.
Just like a JT8D
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