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

[paintgun]

Oh I don't dispute that at all. This length debate is mostly about three things: 1) Whether the J-20 is some 23 meter long flying behemoth, 2) Who's preferred method of measurements are right, and 3) Ego.

It's a 23m flying behemoth based on Mig 1.44 blueprint, with F-117 stealth material and stolen F-35 data

 

[Blitzo]

It's a 23m flying behemoth based on Mig 1.44 blueprint, with F-117 stealth material and stolen F-35 data

Lol for a moment there you almost convinced me. Well played.

 

[latenlazy]

It's a 23m flying behemoth based on Mig 1.44 blueprint, with F-117 stealth material and stolen F-35 data

You're just trying to set me off now aren't you :|

 

[tony0989]

Suddenly, I feel there are so many PhDs in this forum..........

 

[paintgun]

Suddenly, I feel there are so many PhDs in this forum..........

in the absence of hard data, everyone is equally stuck with eyeball Mk.1

 

[latenlazy]

Suddenly, I feel there are so many PhDs in this forum..........

Some people in this forum actually have graduate degrees. Some discussions in this forum don't need anything more than basic high school math (like size).

 

[chuck731]

Regarding the length of J-20, it is rather long compared to the F-22
While the difference in actual length is not much, the fuselage is at least 10% longer than the F-22

If someone tries to extrapolate this as a handicap in maneuverability it might or might not hold merit, again as there too many factors to weigh in and simple eyeballing will not suffice, unless you've worked in various projects concerning similar aircraft i.e canard config, so much that past experience working with those data can give you a ballpark estimate of J-20's aerodynamics, then again no sane engineer will do that as well, no data no cigar

I was informed by a professor in fluid dynamics that j-20's length is very likely dictated by desire to achieve lower wave drag compared to f-22. This suggests three non mutually exclusive design objectives: super cruise with lower thrust to weight ratio than f-22, achieve longer super cruise range on similar fuel fraction and engine fuel efficiency as f-22, or sustain a higher super cruise speed with similar thrust to weight ratio as f-22.

 

[latenlazy]

I was informed by a professor in fluid dynamics that j-20's length is very likely dictated by desire to achieve lower wave drag compared to f-22. This suggests three non mutually exclusive design objectives: super cruise with lower thrust to weight ratio than f-22, achieve longer super cruise range on similar fuel fraction and engine fuel efficiency as f-22, or sustain a higher super cruise speed with similar thrust to weight ratio as f-22.

Yep, area ruling.

 

[tony0989]

I was informed by a professor in fluid dynamics that j-20's length is very likely dictated by desire to achieve lower wave drag compared to f-22. This suggests three non mutually exclusive design objectives: super cruise with lower thrust to weight ratio than f-22, achieve longer super cruise range on similar fuel fraction and engine fuel efficiency as f-22, or sustain a higher super cruise speed with similar thrust to weight ratio as f-22.

Would you please specify which professor and which university?

 

[latenlazy]

Would you please specify which professor and which university?

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That's what Chuck/his professor was talking about.