PPRuNe Forums - Wet runway ops

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- - Wet runway ops (https://www.pprune.org/tech-log/525517-wet-runway-ops.html)

Just to get the facts right:

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For the Falcon 20, DCONTAM is negligible below 0.1 inch EWD (approximately 3 mm). And then it rises and becomes an issue above 3mm.

And the wrong assumption again:

Quote:

What matters is the fact that the wheels must push the water out of the way in order to move forward. This requires energy. The fact that some of the available energy is being used to push water aside, means that there is less energy available to accelerate the aircraft. So the distance required to accelerate to a given speed is greater.

...which was a response to:

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I have a question regarding the take-off on a wet runway. (Wet less than 3 mm)

Are we done?

Quote:

Originally Posted by cosmo kramer

(although I believe the first P in PPRuNe stands for Professional)

I used to believe that too, but it was explained to me that's no longer the case.

By my math, a strip of water 3mm deep, 1 M wide, and 1KM long would weigh 3000 KG. That's not an insignificant amount of weight to move out of the way, especially since it probably gets accelerated to something like the aircraft's own velocity. (Of course, that's pretty slow for the water at the beginning of the takeoff run, but not for all of it.)

Wet Tulips! Very amusing. :D