J-20... The New Generation Fighter II

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latenlazy

Brigadier
latenlazy wrote:
Length gives you a longer momentum arm so it's easier to turn your nose

For aircraft of the same shape but different size the larger aircraft has a larger moment of mass and so it is slower in following the control surface deflections. It is less easy to turn your nose.
Well, to complicate things, for an aircraft turning speed is also dependent on lift and the static stability, plus we don't know what the mass of this aircraft is. He was asking about length so I just assumed ceteris paribus.
 

Asymptote

Banned Idiot
Re: China J-20 Mighty Dragon is roughly the size of a Su-27

The wheels on the J-20 and Su-27 are about the same size. Same thing for length of cockpit, size of pilots' heads, size of pilot helmets, and engine size.

aHWsa.jpg

J-20 Mighty Dragon and Su-27 comparison

[Note: Thank you to "MIG-23MLD" for posting the picture.]

9uyfqv.jpg


You are quite right, I examine the picture pixel by pixel - everything seems to line up almost perfectly, EXCEPT the pilot's head - either Chinese pilot's head is enormous (its about 130% larger) or the J-20 is smaller.

For some reason, J-20 looks closer to the camera hence the pilot looks larger. If you scale it down slightly, I think it might even be smaller than F-22 or PAK FA.

Also Su-27UB is 21.9 m long, from tip of the nose to the end of the boom, even measuring against that J-20 is shorter by quite a bit.
 

latenlazy

Brigadier
Re: China J-20 Mighty Dragon is roughly the size of a Su-27

9uyfqv.jpg


You are quite right, I examine the picture pixel by pixel - everything seems to line up almost perfectly, EXCEPT the pilot's head - either Chinese pilot's head is enormous (its about 130% larger) or the J-20 is smaller.

For some reason, J-20 looks closer to the camera hence the pilot looks larger. If you scale it down slightly, I think it might even be smaller than F-22 or PAK FA.

Also Su-27UB is 21.9 m long, from tip of the nose to the end of the boom, even measuring against that J-20 is shorter by quite a bit.
You guys don't know what you're doing.
 

Blitzo

Lieutenant General
Staff member
Super Moderator
Registered Member
^ or he's wearing a more bulky helmet... (or the j-20 pilot is leaning forwards? I don't see how you would go and say j-20 is smaller because of this one mismatch which can easily be explained... You jump to one of the most unlikely conclusions. just because everything on the two photos seem to match they are necessarily like that. There are better ways to judge the j20s size and putting it next to a flanker and call it good)

I think that that comparison photo isn't particularly accurate, but it's also way out there to believe j20 is smaller than the f-22 ad t50 when by almost every other persons estimate and every other picture shows it is clearly larger. By how much is another matter but it is definitely not smaller.
 
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