Definition
Pressure applied to the rudder pedal on the inside (lower) side of a turn, yawing the airplane's nose toward the lowered wing. In a cross-control stall scenario, applying bottom rudder while holding opposite aileron creates a crossed-control condition that can provoke a sudden stall and rolloff toward the lowered wing.
Plain English
Pushing on the rudder pedal on the same side as the wing that's tilted down in a turn. This forces the nose to swing further into the turn, and combined with opposite aileron it sets up a dangerous stall.
Context Anchor
Seen in cross-control stall discussions, especially when describing a skidding turn near the ground, such as an overshoot from base to final.
Derivation
Bottom comes from the Old English word botm, meaning the lowest part. Rudder comes from an old word for a steering oar. Pressure here means a force applied by the pilot’s foot to a rudder pedal. Together, the phrase means foot force on the rudder pedal on the lower, or bottom, side of the bank.
Why Pilots Care
Recognizing bottom rudder pressure helps pilots avoid entering an unintentional spin during training maneuvers and teaches proper coordination to prevent loss of control.
Grounding Statement
Picture a left bank: the left wing is low, so pressing left rudder is bottom rudder pressure.
Intuition Check
Bottom rudder pressure does not mean pressure on the bottom of the rudder surface. It means foot pressure on the rudder pedal toward the low-wing side of the bank.
Example Sentence 1
When the student overshot the final approach centerline, the instructor watched carefully to make sure she didn't add bottom rudder pressure to swing the nose back around.
Example Sentence 2
Releasing bottom rudder pressure immediately after the stall break allows the wings to level and prevents the airplane from entering a spin.