DG Flugzeugbau DG-1000 Flight Manual page 62

Flight manual DG-1000T
Stall turn
To fly a stall turn safely, proceed as follows:
Don't choose an entry speed of less than 200 km/h (108 kts.).
During the pull out, when reaching the vertical flight path initiate rotation at
min. 150 km/h (81 kts.) with the rudder. Push the rudder quickly, but not
abruptly. During the turn apply a little aileron against the direction of turn and
full forward stick deflection to execute the turn correctly in one plane.
As soon as you reach the vertical dive, start to pull out of the dive to minimize
the increase of airspeed and the g-loads.
Be careful not to exceed the airspeed for max. control surface deflection as
indicated in section 2.2.
Caution: A classical stall turn with almost no airspeed at the highest point of the
turn is very difficult to fly with a glider with larger wingspan, due to the high
moment of inertia.
This effect is taken into account when using the above mentioned procedure.
Only a pilot who is trained in the technique to execute during the pull up a slight
side-slip (with a little aileron deflection in the intended turn direction and
appropriate rudder deflection against turn direction) can start to initiate the
rotation at a lower speed of 120 km/h (65 kts.) with fast rudder deflection. The
turn will look nicer and be narrower than with the method described above.
Warning: If the rudder is applied too late and the rotation is insufficient, it is
possible that the glider tailslides (falls tailwards) or falls sideways.
If this happens it is important to hold all controls firmly, preferably at one of the
stops, until the nose swings down. Then, immediately perform a flare out.
Otherwise, due to the reverse airflow, the control surfaces may flap against their
stops and be damaged. In addition holding the control stick at the stop prevents
the stick from making unnecessary movements due to the massbalance weights
in the elevator control system.
Issued: January 2007 TN 1000/10 EASA app.
4.24