horiz tail airfoil observations

With a lifting tail, the center of gravity can be moved aft for normal
flight regimes.

Jack Womack

I'm curious, though - with a lifting (i.e. positively-cambered) tail,
how do you avoid serious drag penalties and/or airflow disruption when
deflecting the elevator upwards enough to induce negative Cl (...in
other words, to have enough pitch-up control authority)? Everything
I've read points towards needing a roughly balanced Cl range for
adequate control authority in both pitch directions... I'm curious,
but a little confused...

Thanks! Take care,

--Noel


Jack wrote:
With a lifting tail, the center of gravity can be moved aft for normal
flight regimes.

Jack Womack