Heathrow - Noise Reduction
Join Date: Jun 2004
Location: london
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
Didn't a fairly recent Airbus study indicate that a significant amount of noise on the approach is generated aerodynamically - maybe even equalling the amount of noise generated by the engines?
In that case, and anyway recognising that late on in the approach when dirtied up the engines run at higher settings, that means that it is the people living near the bottom of the ILS who get the worst hit.
In that case, surely this idea would give a significant improvement just where it is needed most and has to be worth serious consideration. Very few of the aeroplanes landing at LHR are likely to be at max landing mass/weight and even if they were I would expect a 747-400 at max landing mass to use less runway to land than the same aircraft uses to get airborne at max take off mass.
Meanwhile, Airbus (and hopefully Boeing) are looking at reducing the noise generated by landing gear, flaps, undercarriage doors, brake hydraulic pipes etc. Less aerodynamic noise = less drag = lower power settings = even less noise.
In that case, and anyway recognising that late on in the approach when dirtied up the engines run at higher settings, that means that it is the people living near the bottom of the ILS who get the worst hit.
In that case, surely this idea would give a significant improvement just where it is needed most and has to be worth serious consideration. Very few of the aeroplanes landing at LHR are likely to be at max landing mass/weight and even if they were I would expect a 747-400 at max landing mass to use less runway to land than the same aircraft uses to get airborne at max take off mass.
Meanwhile, Airbus (and hopefully Boeing) are looking at reducing the noise generated by landing gear, flaps, undercarriage doors, brake hydraulic pipes etc. Less aerodynamic noise = less drag = lower power settings = even less noise.
Join Date: Aug 2003
Location: Skagness on the beach
Posts: 882
Likes: 0
Received 0 Likes
on
0 Posts
mocoman,
I understand distance doubling and I still think you are being very generous. Very close the the airport eh noise will be so great from the aircraft that 140 ft will mean nothing. Maybe far out, the noise reduction will be just enough to drop the aircraft noise below the 65dB noise floor and then you no longer can hear the aircraft, but up close it will still sound like you are having a train come through the roof.
I understand distance doubling and I still think you are being very generous. Very close the the airport eh noise will be so great from the aircraft that 140 ft will mean nothing. Maybe far out, the noise reduction will be just enough to drop the aircraft noise below the 65dB noise floor and then you no longer can hear the aircraft, but up close it will still sound like you are having a train come through the roof.
Location, Location, Location
Join Date: Oct 2003
Location: If it moves, watch it like a hawk: If it doesn't, hit it with a hammer until it does...
Age: 60
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
Very close the the airport eh<sic> noise will be so great from the aircraft that 140 ft will mean nothing
