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Originally posted by Murcielago
Actually I believe that the speed of sound is 760 mph. But at sea level I thinks it 670 mph.
Originally posted by NickS1004
You know the SR-71 had slightly less thrust (32,000lbs each engine) and weighed more (100k pounds or something) yet was able to reach mach 3.2.
The reason for this had more to do with the intakes than the actual engine
If the F-22 does indeed have variable intakes, i would say its mach 3 capable, if it doesnt.. mach 2 is more likely
Originally posted by SpockO_o
2.84 Pfftt My Nova can do 3.00
Originally posted by Valhall
Actually, you can't take subsonic calculations and extrapolate them to supersonic calculations and get an accurate air velocity result.
Basically, two sets of equations.
EDIT: Plus, thrust over weight won't get you an accurate calculation. You're going to have to take into account drag.
[edit on 8-7-2004 by Valhall]
Originally posted by sminkeypinkey
Sorry and all, interesting little exercise in maths etc but this has no relation to the reality.
Firstly you can't just ignore drag as it's the next biggest germane factor after outright power.
Secondly you have completely ignored the F22's construction materials.
One of the things that made Concorde such a big deal of an achievement was it being a fully certified scheduled airliner capable of sustaining mach 2.2 for thousands of miles.
The sustained speed ability was a feat few other aircraft could match (never mind the rest of it) because Concorde had 'heat soak' capabilities way beyond the requirements a brief supersonic dash places on a run of the mill supersonic aircraft (yes, I know about supercruise - but that is only claimed at speeds of under mach 2)....North American did it with the XB70 and Lockheed achieved similar with the SR71/A12 aircrafdt but at mach 3+.
Few others have come anywhere near such an ability, ever.
Concorde was 'limited' to mach 2.2 because of the materials she was constructed from, not due to power or drag limitations. As an aluminium alloy skin was settled upon for Concorde that in itself demanded that mach 2.2 be the 'top speed' when in fact, given the power and aerodynamics of the plane, it need not have been.
Therefore to know the max speed of the F22 one muct know the heat soak abilities of the airframe and any limitations the unavoidable kinetic heating at high speeds impose on the construction.
This isn't a field for a quick calculation on the back of an envelope, those days are long long gone. Keep up the math though!
[edit on 8-8-2004 by sminkeypinkey]
Originally posted by WestPoint23
The Raptor has to have less drag than the F-15 cuz it carries all of its weapons inside the F-15 doesn't yet it is still able to do Mach 2.35 with less powerful engines than the raptor.
Originally posted by TACHYON
Thats pretty fast, I thought it was Mach 2.5 tops. Anyway is the F-15 skin alumunimum or something and what about the raptors.