Charlie S Charlie - typo error on my part - it should be 20 kts IAS, 40 kts GS. I could have just edited the post but I thought I ought to own up!
Coyote - "managing your airspeed" just means maintaining it by maintaining your attitude. As mentioned before, the natural tendency is to use groundspeed as a reference and keep it constant - this will lose you airspeed as you turn downwind.
Overpitched - if you transition forwards, backwards or sideways - at 10 to 15 kts of airflow across the disc the rotor will experience translational lift and an increase in thrust. That is why the rotor doesn't care which way the wind is coming from, it just responds to airflow across it.