Flight manual DG-1000S
Issued: March 2002
LBA app.
4.20
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. 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.
Then flare out immediately.
Flight manual DG-1000S
Issued: March 2002
LBA app.
4.21
4.5.8.2
Category A, Aerobatic
Only approved with 18m span and without waterballast, max. mass 630 kg
(1389 lbs.) and with the weight of the rear pilot compensated by ballast in the
ballast box in the fin see section 6.8.7 and with the required equipment installed
see section 2.10.
Execute only the approved manoeuvres.
Don't execute aerobatics below the safety altitude required by national law.
Approved manoeuvres
(Category A, Aerobatic):
All manoeuvres approved for category U, Utility and additionally:
Approved manoeuvres
recommended airspeed
g-load
Inverted flight
120 - 200 km/h (65-108 kts.)
-1
Approved manoeuvres
entry speeds
g-loads
half loop and half roll
220 km/h (119 kts.)
+5.0
half roll and half loop
180 – 200 km/h (97-108 kts.)
+4.5
slow roll
180 - 200 km/h (97-108 kts.)
+/-1.5
half positive flick roll from normal
to inverted flight with half pos.
loop
120 - 140 km/h (65 - 76 kts.)
+4.0
half negative flick roll from
inverted to normal flight
130 – 150 km/h (70 - 81 kts.)
-3.5
Caution:
the DG-1000S is equipped with a powerful longitudinal trimming
device. In addition the mass balance weight of the elevator is incorporated in the
elevator control system. Due to these facts the elevator control forces during
inverted flight change considerably with trim position.
It is strongly recommended to trim the glider to approx. 140 km/h (76 kts.) in
horizontal flight prior to executing aerobatics, especially prior to inverted flight.
