Here are some simple speed and runway length estimators for the Embraer Legacy 600/ERJ-135. The Legacy 600 is based on the shortened ERJ 135 model, but includes added range with extra fuel tanks and added winglets, similar to those on the ERJ 145XR.
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Empty Weight: 30148 lbs
Max Fuel: 10195 lbs
Max payload: 5291 lbs
MTOW: 49758 lbs
TOW = Take Off Weight, lbs.
LWT = Landing Weight, lbs.
WT = Weight, lbs.
Takeoff (Flaps 18)
V1 = 49.336 + 0.0017 * TOW
Vr = V1
V2 = 68.387 + 0.0013 * TOW
Vfs= 81.535 + 0.0019 * TOW
Land (Flaps 45)
Vtarget = 81.52 + 0.0019 LWT
Vref45 = 69.327 + 0.0014 LWT
Runway Length = 1369.1 + 0.759 * WT
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