The MiG 21 had all-moving tailplanes or stabilators. When rolling, did one stabilator pitch up and the other down to act as secondary ailerons and help the main ones on the wing?

  • $\begingroup$ This video should at 6.35 gives a good view of a roll - no tailplane activity. youtube.com/watch?v=uePIzbYI7BU $\endgroup$
    – Party Ark
    Jun 20 '20 at 11:58
  • $\begingroup$ Spoiler alert - no, the stabilisers didn't pitch when rolling in the video. $\endgroup$ Jun 20 '20 at 12:56
  • $\begingroup$ "Spoiler alert - no, the stabilisers didn't pitch when rolling in the video"-because is 1 G rolling maneuver. $\endgroup$
    – George Geo
    Jun 20 '20 at 13:05


MiG-21 (any modification) didn't need it and didn't have it. With its low-aspect-ratio delta wing and most mass concentrated in the centre, it was agile enough with standard ailerons.

The elevator had a single hydraulic booster driving both halves of the stabiliser.

Differential stabiliser was used on MiG-21's successor, MiG-23. That one had no ailerons at all; it had full-span flaps on its swing wing instead. Roll was controlled by the spoilers and the differential stabiliser.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.