Given 3506 is probably one of the earliest prototypes I don't think it can accurately reflect how a production model would be.The detonating cord of the J-35 is the same as the J-20, but the Luneburg lens is not retractable.
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Is it, though? AFAIK there are four known prototypes (3501, 3503, 3505 and 3506), with 3506 having been first observed only this year.Given 3506 is probably one of the earliest prototypes I don't think it can accurately reflect how a production model would be.
An interesting comparison between the J-35 and the J-35a. While it may not be entirely accurate, it still offers a helpful overview to see the differences side by side:
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I'd take those with a big grain of salt. Some numbers might be fairly accurate since the photos from Zhuhai likely allowed for decent measurements, but others are probably just rough estimates at best. In some cases, like the max takeoff weight, they're primarily guesswork.How accurate are the different specifications between the J-35 and J-35A