The video in question, posted to Reddit and showing an F-35 Lightning II performing a loop during what appears to be a July 4th airshow or flyover, has prompted a common but instructive question from a non-pilot observer: why does the aircraft's flight path and control surface movement look irregular during the descending portion of the maneuver. The observation about the vertical stabilizers appearing to move or "recalibrate" is not a malfunction but a visible manifestation of the F-35's fly-by-wire flight control system actively working to maintain the commanded flight path through varying angles of attack, airspeed, and load factor as the aircraft transitions from the vertical upline through the top of the loop and into the pull-out. The differentially moving twin tails on the F-35 are functioning exactly as designed, providing yaw and roll authority through asymmetric deflection, and this is often far more visible on camera during high-alpha, low-airspeed segments of a loop than during level flight, where the control inputs are subtler and less frequently commanded.
A loop is aerodynamically one of the more demanding maneuvers to fly cleanly, particularly at low altitude in front of a crowd, because the pilot must continuously adjust pitch rate, bank angle, and power to keep the maneuver symmetrical against a fixed ground reference despite wind drift and the aircraft's changing energy state. Near the top of the loop, airspeed bleeds off substantially, angle of attack increases, and the flight control computers command larger and more frequent control surface movements to hold the desired pitch rate and prevent an unintended departure from controlled flight. This is precisely the phase where an untrained eye is likely to perceive "roughness" or non-smooth motion, when in fact the jet's quadruplex fly-by-wire system is making rapid micro-corrections that would be structurally and aerodynamically impossible for a human pilot to input directly through manual reversion. The "up, up, up" callout referenced in the post is almost certainly a safety observer or range control officer's verbal cue, a standard practice at airshows and demonstration flights where a spotter monitors altitude, airspeed, and aircraft attitude and calls corrections or warnings over the radio to help the display pilot manage energy state and avoid exceeding safe parameters, particularly during maneuvers with a low point close to the ground.
For working pilots, this kind of viral video and public misinterpretation is a useful reminder of how differently laypeople and professionals read the same flight data. What looks like instability or a hardware glitch to an untrained observer is, in most cases, textbook fly-by-wire behavior, active control law compensation, or simply the visual artifact of camera frame rate and compression interacting with a fast-moving, high-contrast airframe against the sky. This gap in interpretation is significant for airshow performers, demonstration teams, and military public affairs offices, all of whom regularly field questions and conspiracy-adjacent commentary after routine but visually dramatic maneuvers circulate on social media. It also underscores why airshow safety protocols, including dedicated safety observers, minimum altitude waivers, and standardized radio calls, exist independent of the aircraft's own automation; the ground-based callouts are a redundant layer of risk management, not an indication that the aircraft or pilot is struggling.
More broadly, this incident sits within a growing pattern in which high-performance fast-jet demonstrations, especially those flown by advanced fly-by-wire platforms like the F-35, generate outsized public scrutiny on social media because the control system's normal behavior looks unfamiliar compared to the smoother, more conservative maneuvering most people associate with airliners or general aviation aircraft. As short-form video and slow-motion replay tools make it easier for any viewer to freeze-frame a military flight demonstration, pilots and industry communicators are likely to see more of these "is this normal" threads, reinforcing the value of clear public explanations from squadrons, air boss teams, and aviation media about what advanced flight control systems are actually doing during high-G, low-speed maneuvers at airshows.