J-20 5th Gen Fighter Thread IV (Closed to posting)
- Thread starter siegecrossbow
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I'm not sure why you posted that. Your first link cites information from 1997, and the second supports what Skywatcher wrote.
Were you trying to acknowledge that he's right or say that he's incorrect?
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MiG-29
Banned Idiot
Speed: Mach 2.5 classArmament:
I'm not sure why you posted that. Your first link cites information from 1997, and the second supports what Skywatcher wrote.
Were you trying to acknowledge that he's right or say that he's incorrect?
F-15A/B/C/D Mix of air-to-air weaponry includes: 20mm cannon, AIM-120 (AMRAAM) missiles, AIM-9
(Sidewinder) missiles, AIM-7 (Sparrow) missiles
F-15E Air-to-ground ordnance includes precision guided munitions, and a variety of missiles and
bombs. Air-to-air weaponry includes cannon, and eight medium- and short-range missiles
Still not sure what you're trying to say.
MiG-29
Banned Idiot
simple F-15 mach 2.5 class, F-22 mach 2 class, there is no ambiguety as you claim.
Lockheed says max speed of F-22 is Mach 2 class as Boeing says F-15 max speed Mach 2.5 class.
J-20 is around Mach 2 speed like F-22, very likely Mach 1.8
???
By giving an example of a Mach 2+ plane with fixed inlets, you're still just helping to disprove your number of Mach 1.8 for the J-20.
That's like a complete 180 degree turn from the point you've been trying to make for the past few pages. That's why I'm still not sure why you're posting this. Are you saying these facts support a higher top speed for the J-20 beyond Mach 1.8, or are you posting this fact for something else???
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You're just a natural born leader among men lad! AFB and you certainly are among the most cheerfull bro, Merry Christmas!
MiG-29
Banned Idiot
Keynes you do not need to take me so seriously, that is just an opinion, i base my estimated upon F-35`s and JF-17`s speed, their DSI are so simple, to reduce at the most moveable parts, granting excellent stealth and reducing greatly maintainace.
When Chengdu releases the speed of J-20 we will see a true max speed.
What i read on the Pakistani patent of the JF-17`s DSI was its design mach number is 1.7, however in Zhuhai they said the speed is Mach 1.6.
As the intake goes faster and pressure recovery drops, so goes for the engine`s thust because static thrust drops too.
So JF-17 has lower speed probably to increase the engine service life and allow for the max thrust.
You can have a fighter that goes faster than its max speed in terms of operational service, but its engine pays the price, so most jets are limited in part to intake and engine operation.
Can F-22 fly Mach 2.2, yes perhaps, but the engine will pay the price, the F-8III flew at Mach 2.6 but it never went into production.
The variable geometry intakes allow a safer way of flying faster, so J-20 with a fixed intake has operational limits too.
I think a Mach 1.8 will be a speed more or less logic for a fixed external compression DSI.
The danger of operating a engine with low presure recovery is also safety since engines can flame out get damage or stall.
Mach 1.8 i think will be a safe and good speed without afterbuner and Mach 2 a relative safe operation speed for J-20
Actually the top speed of the F-22 and the YF-23 are classified, they could tell ya, but then they'd hafta kill ya! cause ya tell everything you think you know! one thing is certain Mig, you will never have a Top Secret clearance. Sorry Charlie, AFB
Engineer
Major
You are now trying to redefine the meaning of "maximum speed" to justify your myths that were already debunked. Maximum speed is the highest airspeed an aircraft can achieve, and this number remains constant irrespective of whether the engine gets totaled or not. A great example is the MiG-25, which can fly at Mach 3.2 even though the engines have to be replaced afterward. However, most aircraft doesn't have to pay such price, since they do not fly anywhere near Mach 3.0 even at their maximum speed.
Nonsense. Variable geometry inlets are not safer. They are actually more dangerous because of existence of moving parts where more can go wrong. . . Another one of your myths debunked.
You claim, and you claim, and you claim, but repeating the same myth isn't going to alter the fact that DSI is perfectly functional at Mach 2.0. Not only that, but DSI achieves similar pressure recovery ratio at Mach 2.0 as a variable-geometry inlet. Both are proven in a research paper:
From the graph below, the variable-geometry inlet on F-4D can only achieve a pressure recovery ratio of 0.87 at Mach 2.0. This is the same as that of DSI.
An aircraft flying faster than Mach 2.0 with a fixed inlet means that fixed inlet is perfectly functional at over Mach 2.0. That will remain true regardless of how you redefine the meaning of "maximum speed" to incorporate engine life expectancy or safety. What's more, the J-20 will have a better chance flying faster than Mach 2.0 than most fighter aircraft, since the J-20 has less drag since the aircraft is designed to supercruise and doesn't have to carry any external stores.
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