J-20 goes operational again

Military aircraft - Post cold war aircraft, including for example B-2, Gripen, F-18E/F Super Hornet, Rafale, and Typhoon.
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milosh

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Unread post09 Oct 2019, 17:33

weasel1962 wrote:The tomcats may have benefited from the F-111 experience.


On YT you have excellent F-14 presentation done by back then Grumman vice president he was clear they learned a lot from F-111, he said if there wasn't F-111 we wouldn't be able to make F-14 as good as it is.
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inst

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Unread post16 Oct 2019, 01:48

One topic that's pissed off both Chinats and neutral observers of the J-20 on SDF recently is discussion of the J-20's inlets.

We know that the Al-31 cannot provide sufficient thrust at altitude for the Su-27 with its variable inlets. The drag estimated for about 35,000 FT to at the Mach barrier is about 20,000 lbs. To reach Mach 1.4, you'd need about 25,000 pounds. The AL-31, at best, can do something like 60.5 kN with 2 engines (13,500 pounds) at that altitude and at Mach 1.1.

Is it possible that the Al-31 / WS-10 can do so at altitude given larger inlets (greater initial airflow), longer inlet length (greater space for the diffuser to do its work), as well as bypass ducts (as on the F-22) to bleed off low-speed excess airflow?

The total inlet length, ignoring geometry, is around 8-8.5 meters on the J-20, vs about 5 meters on the F-22.

Suspected bypass ducts on the J-20:

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https://www.quora.com/What-are-these-op ... of-an-F-22

Known bypass ducts on the F-22:

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sferrin

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Unread post16 Oct 2019, 13:19

inst wrote:Suspected bypass ducts on the J-20:

Image


Where? And suspected by who? All I'm seeing are panel edges. Bypass doors are pretty obvious.

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inst

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Unread post18 Oct 2019, 15:52

You can see the discolored tiles that form a band. But DSI inlets don't have bypass, right? Except for the bypass ports in front of the main inlet.
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XanderCrews

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Unread post18 Oct 2019, 18:00

milosh wrote:
weasel1962 wrote:The tomcats may have benefited from the F-111 experience.


On YT you have excellent F-14 presentation done by back then Grumman vice president he was clear they learned a lot from F-111, he said if there wasn't F-111 we wouldn't be able to make F-14 as good as it is.



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element1loop

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Unread post19 Oct 2019, 09:03

J-20 Jets Showcase Missiles

(Source: Global Times; issued Oct 18, 2019)

At an air show in Changchun this week, the Chinese Air Force displayed two J-20 fighters carrying short-range air-to-air missiles which rotated out from their side missile bays, where they are stored to maintain the aircraft's stealth. (PLA photo) China's most advanced fighter jet, J-20, once again revealed its missiles at the Chinese Air Force's "open day" event on Thursday, which also showcased the outstanding flight performances of a number of the PLA's warplanes. The open day, which runs from Thursday to Monday in Changchun, Northeast China's Jilin Province, is part of celebrations to commemorate the 70th anniversary of the founding of the Chinese People's Liberation Army (PLA) Air Force.

A pair of J-20 stealth fighter jets flew during the event's flight performance on Thursday morning. Each of them showcased two short-range combat missiles, which rotated out from their side missile bays, where they were usually stored to maintain the aircraft's stealth capability. This is only the second time the J-20 has showcased its missiles. The first was at the 2018 edition of Airshow China in Zhuhai, South China's Guangdong Province. The aircraft did not open its main weapon bay on Thursday. A series of aerobatic maneuvers, including high-speed dives, climbs and rolls from the country's most advanced fighter jets marveled the crowd. The maneuvers were combat-oriented, as each one had a tactical meaning and were used in actual combat scenarios to gain a superior position or avoid an attack, analysts said. ...

https://www.defense-aerospace.com/artic ... siles.html


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Chinese PL-10E*
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French MICA
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* Any similarity is purely coincidental.
Accel + Alt + VLO + DAS + MDF + Radial Distance = LIFE . . . Always choose Stealth
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