Poor fella probably wishes he never asked! 4L3X, just tell your instructor about the greater lift required due to the inclination of the lift vector, and the increased drag that results.
Beags, Wiz, Deliverance: Talk to me about the kinetic energy of the aircraft in my example at 30kts GS and 90kts GS. You've got to input energy if you wish to maintain airspeed. If you don't you'll come out of the turn at a reduced airspeed.