Airfoil Knot Threshold 
Pilot Institute
MARCH 28, 2025
When air flows over the aircraft wing, the shape of the airfoil creates low pressure above the wing and relatively higher pressure below the wing. This lateral movement takes place at a speed of about two or three knots. This distance is measured when the preceding aircraft is over the runway threshold.
Vintage Aviation News
OCTOBER 18, 2024
“Coming back around, I’m usually at about 60 knots. And then when you get down near the threshold, you just hold it off and gently let the wheels down. This was a characteristic of the Mk II and Mk III Bulldogs, but was eliminated in the Mk IV when the airfoil was changed, enclosing the tanks entirely.
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