J-20 5th Gen Fighter Thread VI

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Air Force Brat

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Headed to Oshkosk wisconsin to see the F-22 fly today, F-35 to fly in Milwaukkee tommorow,. J-20 near peers.

I did indeed see the F-22 fly yesterday, it was the Low Slow Show, LOL, although an early low pass with a very hard pull to the vertical did show "Loco" shedding clouds of vapor vortices! I was tired, and walked way to far, so when it started raining, I packed up and headed back to the ranch, blew off the poor little ThunderHoggeII, and regretted it all day today... I even got a speeding ticket for doing 61 mph... LOL

My point here about the J-20 is we learned volumes about the J-20's outstanding low speed handling at Zhuhai, those clouds of vapor show you airflow, vortex forming and "breaking", energizing the airflow over the top of the wing...

So we can indeed "eyeball" aerodynamics, more specifically airflow, not only by visible vapor, but by control positions and aircraft response or the lack there of to the positions of the control surfaces..

We have created "wind tunnels" and introduced colored smoke upstream, to show us exactly what happens as your airfoil slices through the "ambient air".

The 5 J-20's that flew on the last day of Zhuhai were each educating us about J-20's high lift aerodynamics and outstanding turning performance, there was plenty of vapor present to help you visualize airflow...

Zhuhai was a very rare display of the J-20 flown to its limits, and China put the J-20 up to sell "performance"!
 

Hendrik_2000

Lieutenant General
Via JSch
J-20 fighter makes combat unit debut
By Liu Xuanzun Source:Global Times Published: 2019/7/28 22:53:39

PLA photo indicates new jet has passed trials: experts

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A photo released by the People's Liberation Army Air Force on Wednesday shows for the first time what reports said to be a J-20 affiliated with a combat unit, suggesting that the aircraft has graduated from a trial unit and is ready for active duty. Photo: screenshot from cctv.com

The Chinese People's Liberation Army (PLA) Air Force for the first time released a photo of a J-20 stealth fighter jet showing the serial number of a combat unit, indicating that the warplane has ended trials and become a potent warplane protecting the country.

A photo with the caption "An Air Force J-20 fighter conducts real combat training" was released by the PLA Air Force on Wednesday, along with a statement introducing its increasing strategic capability.

Although the warplane has been seen in previously published photos and videos, Wednesday's photo attracted attention as it showed a J-20 with the tail number 62001.

This is the first time a J-20 has been seen with tail number beginning with a "6," Weihutang, a program on military affairs affiliated with China Central Television, reported on Friday, noting that the numbers on previously seen J-20s began with a "7."

According to PLA Air Force's tradition, numbers starting with "7" indicate aircraft attached to a trial unit, while the "6" indicates the J-20 is affiliated with a combat unit under the PLA Eastern Theater Command, said Ordnance Industry Science Technology, a Xi'an-based periodical on the national defense industry, in an article published on its WeChat account on Friday.

This suggests that the J-20 is already on combat duty, becoming an important new force in safeguarding China's skies, the magazine said.

In February 2018, the PLA Air Force announced the J-20 has been commissioned into its combat troops, but a photo of it had not been released until now.

The release of the photo of a J-20 with a "6" on its tail also indicates combat troops have mastered the fighter jet, Chinese analysts said.

Fu Qianshao, a Chinese air defense expert, told the Global Times on Sunday that training under a combat unit is different than under a trial unit.

While exploring specific capabilities is likely emphasized in trial unit training, the focus of training under a combat unit includes tactical practice, Fu said, noting that a training syllabus and a maintenance manual have also likely been completed for the aircraft.

Fu believes that the J-20 is now more sophisticated than US' F-35.

The J-20 is listed in China's latest national defense white paper as one of the new, high-tech weapons the Chinese military has commissioned.

Fu said that the aircraft will be mass produced and further enhanced in the future. Its engines, aerodynamic design, weapons and electronics systems including radar, avionics and flight control system could be upgraded, he said.

The public might get to see the J-20 in flight if it makes a flyby over Tiananmen Square in Beijing during an expected parade to celebrate the 70th anniversary of the founding of the People's Republic's on October 1, analysts predicted.
 

Air Force Brat

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Re-posting some lost images... All are high-resolution.

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and here with your last photo, we can very clearly see that the stronger more highly energized vortex is created by the LERX, not the canards. Now the canards should also be creating vortices, but they are far less energetic that the leading edge extenstion.

The picture immediately above it, pictures a very strong vortices off the inlet lip!
 

Air Force Brat

Brigadier
Super Moderator
Last batch...

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and any time an aircraft is making lift? there is indeed a wing tip vortices, notice on the bottom picture, there's a nice vortices being formed at the inboard slat/leading edge flap juncture as well as apparently off the inboard leading edge of the canards, that's what you would call an "active flow" pattern, as the speed of those vortices increase across the top of the wing, they pull the pressure way down, creating lift, and DRAG! LOL

as always, thanks for sharing, you bring an incredible amount of data with these beautiful photos, as they say, a picture is worth a thousand words....

I would add that Zhuhai has been an incredible gold mine, just a fascinating airplane...
 
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