Originally Posted by
choefman
V1 and Vto are the same thing...
There's also (any pilots please correct me if I'm wrong) Vr, which is the minimum velocity at which the pilot can initiate rotation (or pulling back on the stick to get the front gear off the ground). V1 is the maximum velocity at which the takeoff could be aborted and still have runway on which to stop.
Actually, there's a whole slew of V speeds:
https://en.wikipedia.org/wiki/V_speeds