If it matters, the contaminated correction was applied before the crosswind. No doubt, it’s specific to the Lockheed certification and test. It was flight test data. The only question I had and have is that the basic physics are the same—B737-200 or C-5 and everything in between; so it should only be the magnitude, not the direction, if I may say. A lot of the Lockheed and USAF procedure was very conservative.
Having that chart in mind at the time, I did a very wet runway, strong crosswind (20 knots, at least) take-off in a Challenger at Biggin Hill. Being Biggin Hill, it was downhill, too. After airborne for Geneva, I mentioned to the F/O that I’d love to have the Vmcg chart for that take-off. “Why?” “Well, let me explain.....”