[exDM69]

1000m is much higher than real rockets pitch over, but good for KSP with forgiving aerodynamic stress. It's just a convenient round number and gives a few seconds of breathing room to make sure the fiery end of the rocket points to the ground before start of maneuvering.

[dotancohen]

I do remember the Shuttle pitch and roll real early, though I thought that was to point the antennas (K-band was it?) at the receivers.

[exDM69]

The roll is to change the orbital inclination, the pitch is to set ascent trajectory.

[dotancohen]

Got it, great. Much appreciated!