Stator Vane,
The idea of the ploughing effect isn’t just word of mouth, Boeing explains exactly how they calculate contaminated runway data, unfortunately it isn’t information that is normally given to pilots.
The technical term for it is “Displacement Drag” which together with “Impingement Drag” forms your Slush Drag coefficient for the airplanes specific gear arrangement. I wish that there was an easier way for me to explain this, but I cant find one, so here goes……
Your acceleration with slush / standing water is:
a= g/w [Thrust – Drag – Friction – Fslush]
Fslush = 1/2Ρ Vg2 Cdslush Atire where
P = Slush density equal to a specific gravity of 0.85
Vg = Ground speed feet per second
Cdslush = Displacement Drag and Impingement Drag
Atire = (Σb_main + Σb_nose) x slush depth (Σb = avg tire width)
So the depth of slush has a direct impact on your acceleration, the opposite is true for stopping.
This is taken from a 42 page Boeing presentation on the subject of Contaminated Runways. If you want more information, you can either ask Boeing for it or send me your snail mail address.
Rgds.
Mutt
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