J-20 5th Gen Fighter Thread IV (Closed to posting)

[Air Force Brat]

I have no other reason for pointing out that the canards are not as large as the vertical stabilizers other than as a point of fact.

So you're prolly gonna tell me, (like the Honey Badger), that I just like to argue, but really I said they were of a comparable size, the verts prolly do have a little more area, it did occur to me that I didn't know why we were arguing, and heck, I love to argue when I'm at least half-right????

 

[Air Force Brat]

My question would be, why does it have such a large attack angle?
In flight there is no way those canards are going to be pushed into those angles so why are they so maneuverable, are they going to use it as an air brake or something?

Actually Sam, the eng would give you a much better answer, but if you picture the J-20 at a 70+ degree angle of attack, assuming for this picture that the relative wind is parallel to the horizon, those canards are very close to the angle where they would be aligned with the relative wind, they are all flying, and they would then become the PRIMARY pitch control. If you question whether or not the J-20 is capable of achieving such a high angle of attack, just remember that the porky little ThunderHogge II was flown to an angle of 73 degrees angle of attack and recovered to normal flight with-out departing, so yes they need that much control "throw" in order to manage pitch at "very high" angles of attack. The Nose of the aircraft is very high! the pilot will be "sitting on his back, rather than his backside".

That is also the premise that DR. Song used when he demanded that the J-20 be recoverable from very high alpha with or with-out OVT or in case of OVT failure??? or in this case, it seems the design team has decided the J-20 does not need OVT??

 

[no_name]

Basically you want to move your pitch control surface as much angles as your maximum designed angle of attack (?)

And since F-35 has done 60+ AoA maneuvers that is at least how much the horizontal stab can depress?

 

[Air Force Brat]

Basically you want to move your pitch control surface as much angles as your maximum designed angle of attack (?)

And since F-35 has done 60+ AoA maneuvers that is at least how much the horizontal stab can depress?

Yes, you want the all flying canard to be aligned with or maybe have a +10 angle of attack to the relative wind, remember the canard is designed to stall before the main wing actually departs, that has always been one of the beauties of the canard. So with the aircraft at a 60+ degree angle of attack, the canard would be angled sharply downward when compared to the main wing, this is called a "long throw" movement of the control surfaces, and as you have so astutely deduced, the horizontal stab of the F-35 also has a very long throw in order for it to force the main wing to such a high angle of attack, the Lightning II was flown to 73+ angle of attack, and recovered. This is a very high angle of attack for an aircraft without OVT, so I'm not sure all of the parameters of the test, and how they initiated this high alpha regime?????

as I have stated before the J-20 is a very smart airplane, and the FCS is a wonder of computational genious, and seems to work very well, as I noted of several videos of 2001, it did a very nice aileron roll........

 

[Lethe]

My question would be, why does it have such a large attack angle?
In flight there is no way those canards are going to be pushed into those angles so why are they so maneuverable, are they going to use it as an air brake or something?

Reduce landing distance.

 

[Deino]

A nice what-if !

 

[Equation]

A nice what-if !

In due time my friend...in due time.

 

[Deino]

posted at the CDF:

29号楼主收到新爆料称：2012风头正盛，2013即将重磅来袭——据一线人员介绍，最新一架歼20已经从大棚挪至跑道边的机棚，目前正在进行飞行前的地面发动机调试，随时随地都有可能与2012编队升空。另在回复中，爆料人称2013极有可能至少换装了一枚国产发动机来测试。

据悉2014号正在总装中，不知进度如何，早在6月份2011号转移阎良时，有人已发帖说2012、2013将要面世。
以上爆料恕不能提供爆料人资料，只提供消息截图如果是真的，静等一线照片吧，但是估计风头正紧，要等一段时间了。
感谢保镖提醒，目前东西有，进度还未达到。希望没有误解保镖的意思。
A版还透露，2001或者2002可能去珠海航展，但是审批够呛。
这贴发的，套了诸位大神这么多料。

PS一则：29日15:20分2012再度升空！

贴一则关于2013号J20的新闻，在超大已经有朋友发过：
【环球军事报道】据俄罗斯军工综合体新闻网7月18日报道，巴基斯坦防务网站论坛7月16日公布了机身编号为2012的中国新一代隐身歼击机第4架飞行试验样机的图片，指出目前正在进行地面测试的这架飞机很快就将升空试飞。
巴基斯坦消息源报道称，目前机身编号为2013的中国下一架歼-20原型机正在安装内置武器舱，而机身编号2014的原型机目前正处于总装阶段。
根据一些媒体的报道，从2011年1月1日起至今，中国目前总共动用3架歼-20原型机进行飞行试验，机身编号分别是2001、2002(后来改为 2004)和2011，后者于今年3月1日升空试飞。随着三架新型飞机(机身编号2012、2013、2014)的加入，试飞原型样机的数量将增加到6架。专家认为，缺少的那架编号2003的原型机，可能是作为地面试验台使用，没有在互联网上曝光。

Basically, two more J-20s will come out soon - with '2013' almost or already rolled-out and '2014' in final assembly, with the 2013 flying with a Chinese engine.


Sounds indeed interesting, but to admit IMO it sound too good to be true.

Even if I too agree that '2013' is not far away, I cannot believe - or would be very much surprised - that / if yet another prototype will be ready so soon. And I even more have my doubts that it will be powered by a Chinese engine.

Anyway ... since I will leave to the summer-holydays tomorrow, I'm almost sure that something spectacular will happen within these three weeks.

Deino

 

[Air Force Brat]

A nice what-if !

OK MAVERICK, It time to do some of that Pilot Stuff!

HANG ON GOOSE, we're going Ballistic!

Deino's getting his bag packed to go to Chengdu, ready to test the two holer, and Chengdu has hired Tom Cruise, and Anthony Edwards to appear in its new promo for the J-20B two holer, with a tail hook for all you true fan boys, yes our favorite teacher is going to do a "book report" on the J-20, stay tuned for update!

 

[Air Force Brat]

The plane is very cool-looking, but why does it still need parachute for landing? Is it necessary?

no, it needs two parachutes! Lockmart is putting chutes on the F-35, I think for Norway and somebody else, they are still a great way to slow your bird down without burning up brakes and tires.....

oh and when they streamer out and then open with a "whump", that is so kool!