>i know it varies by wind and weight and such but how much of a range does that speed have?
Without getting into all the details, a quick look at my AA 737-800 performance charts show Vr ranges of 100 to 157 knots and V2 ranges of 118 to 162 knots. Too many variables to list all possible ranges. Personally, I don't recall any Vr lower than 116 nor greater than 150.
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