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Does anybody know the airspeed or have an estimate? Since it was originally visible to radar, I was wondering why the speed wasn't listed in the article.

Also by what mechanism could anything become radar-invisible mid-flight? Some kind of adaptive geometry? Could things like roll angle have influenced the RCS?




Angle absolutely can affect RCS.

Retracting landing gear, retracting flaps, etc. can reduce RCS.

For military aircraft, closing of weapons bays that were previously open would reduce RCS.

In an extreme case, jettisoning of external fuel tanks and weapons can reduce RCS.


Thanks. I was also wondering if radio wave propagation might have been a factor.

It'd be nice if someone put together a timeline that includes these sensor data so we could build a better model of the situation.




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