C'mon guys let's go back to the basics.
The horizontal component of lift, which is the centripetal forces acting on the airframe in a turn, causes a loss of lift for a given angle of attack and airspeed.
This is why either back cyclic, or increased collective will be required to maintain constant altitude. (The two dynamic components in the lift equation, angle of attack, and velocity).
And for Bertie, I personally believe its better to at least have an idea of WHY you're doing WHAT you're doing, rather than work it out as you go.