J-20 Measurements Thread

Discussion in 'Air Force' started by Inst, Aug 12, 2018.

  1. Inst
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    Inst Senior Member

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    Shall we have another place of exile?

    Just curious, what's the agreed-upon specs for the J-20's dimensions? So far, I see roughly 20.95 and 12.88 for wingspan. With 12.88, I'm measuring the weapons bays and I'm getting roughly 2.4-2.5 meters wide, 550 mm deep, and 4.5 meters long.

    Weight is, of course, a different mystery.
     
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  2. Tirdent
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    Tirdent Junior Member
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    Available material doesn't support giving measurements down to the centimeter, I'd be comfortable with stating 20.9m length, 12.9m span and 75m² wing area at this point.

    Your bay dimensions are not far off my own assessment, I got 2.4m wide and 4..4m long (depth is hard to accurately establish with the photos we have, but it looks a good bit deeper than the F-22's - the ~0.6m bay depth of the Su-57 in mind, 550mm is entirely believable).
     
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  3. Inst
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    Inst Senior Member

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    Looking back at the underlying thread, it's roughly the reverse, i.e, 20.87 + 12.94 for wingspan. My own measurements are 20.84 l 12.93 w.

    More surprisingly, the wing area has been overlooked, a recent measurement I took showed about 76 m^2 in terms of effective wing area including LERXed areas. This gives a loaded wing loading of 395 m^2 under 30000 loaded weight and 345 m^2 at 26200 (18,000 empty wight + 60% of 12000 fuel with 1000 kg of munitions). This is inferior to the F-22 and Su-57.

    Measurements:

    Using this set of coordinates:

    Frontal triangle apex:

    256 539

    Front wingspan

    390 659

    392 421

    Rear wingspan

    417 658

    419 422

    Rear triangle apex

    443 541

    We get roughly 136 pixels of length for the front triangular segment, 27 pixels of length for the central rectangular section, and 25 pixels of length for the rear triangular segment. Using 402.1 for Flanker length (21.94), and double counting the 27 central rectangular section, we get roughly 75.8 m^2 wing area.

    Picture in use:

    [​IMG]
     
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