J-20... The New Generation Fighter II

[dingyibvs]

Sorry for my ignorance guys...

For the first flight for the J20, I noticed that the landing gears are on for the entire flight in the video online. When I saw the PAK 50 first flight, their landing gears were on while flying too.

May I know why is that the case of the landing gear must be on for every first flight? A norm or safety precaution procedure?

Cheers

Both. New aircrafts initially are tested with landing gears down, especially prototype aircrafts or aircrafts testing critical prototype components.

 

[Mashan]

The weapon bay(s) will be the last thing PLA want to expose IMO.

 

[hanqiang1011]

Both. New aircrafts initially are tested with landing gears down, especially prototype aircrafts or aircrafts testing critical prototype components.

Thanks dingyibvs, you have cleared my doubts...

 

[vesicles]

I got a few questions abou the airframe of the J-20:

1) how many hardpints could J-20 have? from a few photos showing he bottom of the plane, it seems that J-20's internal weapons bay is not too big (the area between the landing gears)...

2) from comparing J-20 with F-22, J-20 has the canards as well as movable tails while F-22 has no canard and fixed tails. It seems that J-20 is the only plane out of the 3 stealth fighters with canards and with the smallest wings. So how would all these affect manueverability either positively or negatively?

3) I seem to remember seeing photos of J-20 with a tint of green in its cockpit. So what is that? Is that the holographic (spelling?) HUD?

4) the landing gears seem to be much bulkier than other heavy fighters like Su-27, especially looking from the front. Is this because the stealth plane is much heavier than convetional fighters?

5) Someone asked earlier about the possibility of only changing the nozzle of the engine instead of changing the whole engine. And no one has commented on that yet. So is it possible for them to haul the plane to a place change the nozzle of the plane? So there is actually only one plane with the same engine, only different nozzle? I personally don't think this idea is a little far fetched, but I don't know.

Thanks

 

[yfan]

Re: J-20... The New Generation Fighter

Hi Everyone,

I am new here. I join this forum because there are many good professional analysis here.
Here are a few things puzzling me. I watched the takeoff video over and over again. I noticed following facts:
1. It takes less than 15 sec to take off. (speed 0 to wheel leave the ground)
2. The takeoff speed seems low.
3. The takeoff distance seems quite short. Some Chinese claims that it's only about 200m. I don't believe that. Let me take 300m for the time being.

4. There is absolutely no flame been seen at the nozzle. Not even a little redness.

Let's discuss 1-3 first.
I pull out my calculator, if I take 300m as the takeoff distance, I got 144km/h take off speed. There is no way for that beast to take off at this speed!
So I assume the take off speed was 230km/h, I got 480m of takeoff distance, which seems much longer than what we saw.
The truth may be between, but no matter how you slice it, the takeoff is damn impressive!
Anyone figure out or knows the real takeoff speed and distance?

Let discuss point 4.
When I first saw the picture of J-20, I thought the designer simply give up on the IR stealth. Now I am not sure. Any comments?

 

[siegecrossbow]

I got a few questions abou the airframe of the J-20:

1) how many hardpints could J-20 have? from a few photos showing he bottom of the plane, it seems that J-20's internal weapons bay is not too big (the area between the landing gears)...

2) from comparing J-20 with F-22, J-20 has the canards as well as movable tails while F-22 has no canard and fixed tails. It seems that J-20 is the only plane out of the 3 stealth fighters with canards and with the smallest wings. So how would all these affect manueverability either positively or negatively?

3) I seem to remember seeing photos of J-20 with a tint of green in its cockpit. So what is that? Is that the holographic (spelling?) HUD?

4) the landing gears seem to be much bulkier than other heavy fighters like Su-27, especially looking from the front. Is this because the stealth plane is much heavier than convetional fighters?

5) Someone asked earlier about the possibility of only changing the nozzle of the engine instead of changing the whole engine. And no one has commented on that yet. So is it possible for them to haul the plane to a place change the nozzle of the plane? So there is actually only one plane with the same engine, only different nozzle? I personally don't think this idea is a little far fetched, but I don't know.

Thanks

Answering #1. There is no way for the J-20 to use external hard points for anything other than external fuel tanks.

 

[vesicles]

Answering #1. There is no way for the J-20 to use external hard points for anything other than external fuel tanks.

I meant the internal hardpoints. In other words, how many missiles can J-20 carry? I think F-22 has this revolving wheel thing to hold the missiles. Would J-20 have the same thing?

 

[yfan]

Re: J-20... The New Generation Fighter

Hi Everyone,

I am new here. I join this forum because there are many good professional analysis here.
Here are a few things puzzling me. I watched the takeoff video over and over again. I noticed following facts:
1. It takes less than 15 sec to take off. (speed 0 to wheel leave the ground)
2. The takeoff speed seems low.
3. The takeoff distance seems quite short. Some Chinese claims that it's only about 200m. I don't believe that. Let me take 300m for the time being.

4. There is absolutely no flame been seen at the nozzle. Not even a little redness.

Let's discuss 1-3 first.
I pull out my calculator, if I take 300m as the takeoff distance, I got 144km/h take off speed. There is no way for that beast to take off at this speed!
So I assume the take off speed was 230km/h, I got 480m of takeoff distance, which seems much longer than what we saw.
The truth may be between, but no matter how you slice it, the takeoff is damn impressive!
Anyone figure out or knows the real takeoff speed and distance?

Let discuss point 4.
When I first saw the picture of J-20, I thought the designer simply give up on the IR stealth. Now I am not sure. Any comments?

 

[Maggern]

Re: J-20... The New Generation Fighter

Hi Everyone,

I am new here. I join this forum because there are many good professional analysis here.
Here are a few things puzzling me. I watched the takeoff video over and over again. I noticed following facts:
1. It takes less than 15 sec to take off. (speed 0 to wheel leave the ground)
2. The takeoff speed seems low.
3. The takeoff distance seems quite short. Some Chinese claims that it's only about 200m. I don't believe that. Let me take 300m for the time being.

4. There is absolutely no flame been seen at the nozzle. Not even a little redness.

Let's discuss 1-3 first.
I pull out my calculator, if I take 300m as the takeoff distance, I got 144km/h take off speed. There is no way for that beast to take off at this speed!
So I assume the take off speed was 230km/h, I got 480m of takeoff distance, which seems much longer than what we saw.
The truth may be between, but no matter how you slice it, the takeoff is damn impressive!
Anyone figure out or knows the real takeoff speed and distance?

Let discuss point 4.
When I first saw the picture of J-20, I thought the designer simply give up on the IR stealth. Now I am not sure. Any comments?

(Not precisely related to your points)
1: What are your trying to say?
2. I must agree to what have been mentioned earlier in this thread (sorry for not remembering exact names): The prototype took off with little fuel, no ammunition carriage and the bare minimum (possibly) of software and hardware.
3. No flame? Well. I think most here agree it took off with no afterburner. Other than that, I think we can write it off as eye-witness faults.

 

[Centrist]

I had a similar question for the experts. Do all aircraft require afterburner to take off? What is the significance of the J-20 taking off without afterburner?