What is the hardest fighter plane maneuver?
Pugachev's Cobra
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The maneuver is also potentially a defense against radar, as the sudden change in velocity can often cause Doppler radars to lose their lock on the target.[6] Doppler radars often ignore any objects with a near zero velocity to reduce ground clutter. The cobra maneuver's sudden change to near zero velocity often results in the target being momentarily filtered off as ground clutter, making it difficult for the radar to lock onto the target, or breaking the target lock if already established.