"Wade Hasbrouck" wrote:
Taking off after a heavier aircraft you want to stay above their flight
path and rotate before the point where they rotated.

That's the theory. In practice, I know of very few spam cans that can
outclimb a jet. There's no way you're going to stay above their flight
path if you follow their ground track.

The only way to avoid the wake of a departing jet is a quick turn away from
their track. It helps to be familiar with the IFR departure procedure, so
you can predict which way they'll turn. At HPN, I'll just ask for an
immediate turnout for wake avoidance. I've never had it turned down, and
I'm in my turn before I reach 100 AGL.