The 300, even though being a larger aircraft than the 200, burns less fuel with those same engines. Maybe you should worry about that too!?
Again, not about the weight alone (though it's of course a big factor in jets). -300 cruises faster due to various aerodynamic improvements (0.01 mach more; though for aws game play purposes both have the same cruise speed) and those changes also make the plane more fuel efficient. A source quotes 3-5% better climb fuel performance for example, and another source even 10% better cruise fuel performance (which is quite high and I'm not really buying that).
The aero/structural changes in larger planes can make big differences. I remember when MD-11 first came out it did not meet the performance targerts but several PIPs (performance improvement packages) regained the promised perf.figures and the aerodynamic and weight tweaks improved the fuel consumption very much (something like 5% at least, cannot remember exactly anymore).
No it doesnt help but thanks. Ive lived under the approach path to Rwy 06 at yqm for 35 years. I fly planes myself. I know what im hearing.
Well, what can I say. I fly planes myself. And I sure hope I know what I hear too.. (glup)
And I've researched a bit about this noise certification stuff for the purposes of modelling it to the sim too (though not my strongest area).. It's not about the engines alone like I already pointed about (the jet engine for a modern airliner is at about 40-50% power when on final approach, vs. about 85-105% power on takeoff). But in regards to your original message, see my earlier reply in this thread:
Checking ICAO's database (http://noisedb.stac.aviation-civile.gouv.fr/find.php), I see that all early 747s are grouped together and it's a very longlong list there with all different options and weights. But I'd say that most likely (with a quick look) also the -200 with the 7R4 engines should be chapter 3 (though not a 100% fact).. But I've updated it to the master database (= all future games) now anyway.
More about the aerodynamic noise of aircraft:http://flyquietoak.com/_source/pdf/Tab%202b%20PDF%20links/aircraft_noise_fundamentals.pdf
The noise generated by an aircraft flight is quite complex. The sound sources can be described in four broad categories: jet noise (the mixing of high velocity exhaust gases with ambient air), combustor noise (the noise associated with the rapid oxidation of jet fuel and the associated release of energy), turbomachinery noise (often noticed as an aircraft is coming towards you), and aerodynamic noise (the noise associated with rapid air movement over the airframe and control surfaces). New technologies in modern aircraft have achieved significant reductions in jet noise and combustor noise. Turbomachinery noise has also been reduced in newer aircraft. Aerodynamic noise is a current area of acoustic research to reduce aircraft noise. As jet noise, combustor noise and turbomachinery noise are reduced, aerodynamic noise may remain as the major noise source on aircraft of the future. http://adg.stanford.edu/aa241/noise/noise.html
In addition to the engine noise, the shear of the boundary layer and unsteady vortex shedding from landing gear, landing gear doors, and other separated flows as well as flap edge flows contribute a significant part of the acoustic energy, especially for large aircraft on approach.