It is pointless to compare images taken by different Infrared camera, from different distance, at different altitude. It like saying the moon are hotter than the stars because they appear brighter. Even their thrust mode are not the same.
you don't necessary need square nozzle to mask the hot flame, the vertical stabilator can do that task as well. And besides, if two aircraft flying toward each other then the nozzle will be masked
have you thought that IRST sensibility is not fixed, Russia has used IRST since MiG-23You are basically arguing something that everybody already know. Yes, the exhaust nozzle is hotter than the aircraft skin. That why OLS-35 can detect Su-30 at distance of 90 km from the rear but only 35 km from the frontal aspect
Oh and btw, except for maybe the Mig-31, most aircraft doesn't cruise at Mach 2
All noted.
Again, it is all a matter of direction. If you point at an F-35 which is hovering or having its AB at maximum then sure, you will be able to see the flame clearly. But if it is in MIL and the viewing direction is from frontal, then the flame can be hided very easily
Again, you are arguing a non issue. No one ever said afterburner can't be used at all altitude. The problem is that no aircraft going around on full AB all the time (except for maybe the SR-71 and Concorde). And another issue is that the flame length is also not the same at all altitude (since how much fuel can be burned also affected by air density)
Why are you keep making strawman argument? No one ever said the sensitivity of IRST is fixed. The chart I gave you is for aircraft skin temperature vs speed. The sensitivity of IRST does not affect that.
do you understand that for an engine in order to increase thrust is you get a higher bypass ratio or you increase temperature?Why are you keep making strawman argument? No one ever said the sensitivity of IRST is fixed. The chart I gave you is for aircraft skin temperature vs speed. The sensitivity of IRST does not affect that.
As for Mig-35 and Su-35 IRST detection range, we actually have very clear value from manufacturer
OLS-UE detection range against Su-30 size target from frontal aspect is 15 km
OLS-35 detection range against Su-30 size target from frontal aspect is 35 km
Range measurement for missile launch is 15 km
www.flightglobal.com
IAF Rafales have arrestor hooks
Firstly, F-135 is pretty much a high bypass engine, very significant amount of thrust is generated by the fan instead of the engine core, and that help reduce the flume lengthdo you understand that for an engine in order to increase thrust is you get a higher bypass ratio or you increase temperature?
see and read
Pratt & Whitney confirms that a testbed version of the Lockheed Martin F-35 propulsion system has run sustainably at possibly the highest temperatures ever recorded by a turbofan engine.
The F-135 is hotter got it?Pratt & Whitney raises temperature as it accelerates growth strategy for F135
Pratt & Whitney confirms that a testbed version of the Lockheed Martin F-35 propulsion system has run sustainably at possibly the highest temperatures ever recorded by a turbofan engine.
For jet engine manufacturers, hotter is better. The higher the temperature in the combustion chamber, the more efficient the engine and the less fuel the aircraft consumes. Today’s commercial jet engines can reach temperatures as high as 1,700 degrees Celsius (that’s 3,092 degrees Fahrenheit) because of the highly effective thermal barrier coatings that line the inside of the chamber. Without them, the temperature would be limited to about 1,150 degrees, the point at which heat-resistant nickel superalloys used for jet engines lose their strength as they approach their melting point
.Generating Current as Well as Thrust from Jet Engines
For jet engine manufacturers, hotter is better. The higher the temperature in the combustion chamber, the more efficient the engine and the less fuel the aircraft consumes.engineering.virginia.edu
what aircraft do you think has a hotter engine?
View attachment 186554
see the flame even without IRST
View attachment 186555
Obviously you consider jet engines do not need to be hotter to get higher thrust
The 004B-1 produced a thrust of 2,000 lbf (8.90 kN) and ran primarily on diesel fuel. Gasoline was used for the two-stroke starter motor and for starting the turbojet. A combination of gasoline and diesel was used after starting and then to all diesel fuel.6 Deliveries began in June 1943, but turbine failures were encountered due to resonance vibrations at full speed. The problem was solved by increasing the natural frequency of the blade, (increasing the blade taper) and reducing the speed from 9,000 rpm to 8,700 rpm. Full production was not achieved until early 1944, which delayed the introduction of the Messerschmitt Me 262.
The model 004E was the first turbojet equipped with an afterburner. Extra fuel was injected just before the turbine stator vanes and the exhaust temperature increased to 1,600° F (870° C) and thrust increased from 2,200 lbf (9.80 kN) to 2,640 lbf (11.75 kN). It was scheduled to go into production in 1945
Easy hotter more visible to an IRST
f-135 is hotter than F100 or a Jumo 004,Firstly, F-135 is pretty much a high bypass engine, very significant amount of thrust is generated by the fan instead of the engine core, and that help reduce the flume length
for example
Secondly, the serration on F-35 nozzle help create turbulent to reduce exhaust flume length as well
Thirdly, from head on aspect, you can't see the nozzle and the exhaust because it is hidden by the airframe
It is quite obvious in F-22 images
Firstly, F-135 is pretty much a high bypass engine, very significant amount of thrust is generated by the fan instead of the engine core, and that help reduce the flume length
for example
Secondly, the serration on F-35 nozzle help create turbulent to reduce exhaust flume length as well
Thirdly, from head on aspect, you can't see the nozzle and the exhaust because it is hidden by the airframe
It is quite obvious in F-22 images
Firstly, F-135 is pretty much a high bypass engine, very significant amount of thrust is generated by the fan instead of the engine core, and that help reduce the flume length
for example
Secondly, the serration on F-35 nozzle help create turbulent to reduce exhaust flume length as well
Thirdly, from head on aspect, you can't see the nozzle and the exhaust because it is hidden by the airframe
It is quite obvious in F-22 images
Again, it doesn't really help your argument when you need to rely on strawman argument.
I never said F-135 has the same bypass ratio as commercial engine.
So what?, the maximum detection range of OLS-35 against Su-35 size target from frontal aspect is 35 km, the laser range finder distance is 20 km. It hardly an issue for J-20 with its extreme long range missile
too much propaganda and self decieving,I never said F-135 has the same bypass ratio as commercial engine.
The chart i gave you actually give comparison of engine with bypass ratio from 0.2 to 1.4
There is quite a big different between bypass ratio of 0.2 and 0.6
F-119 has bypass ratio of 0.2
F-135 has bypass ratio of 0.57
And as everyone can clearly see, F-22 can hide its exhaust just fine, so will the F-35
AL-31 makes it underpowered, remember, its DSI is fixed so speed limits are low, plus there are several frequencies that do see Stealth aircraft and add more power stealth aircraft are visible why do you think F-22 is being retired or f-117 retired before F-16 or F-15?
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