Schempp-Hirth Flugzeugbau Ventus-2cM Flight Manual page 67

SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK
Ventus-2cM
For rearward c/g positions and low all-up masses the powered sailplane is lifted
off with flaps set at "0".
In the case of forward c/g positions or high all-up masses a setting of "+1" or
"+2" may be used to shorten the ground roll distance. After lift-off, between
about 80 to 90 km/h (43-49 kt, 50-56 mph), depending on wing loading and flap
setting, the elevator trim (if necessary) can be set for minimum control stick
loads. With flaps set at "0", normal towing speed is in the region of 120 to 140
km/h (65-76 kt, 75-87 mph) and between about 130 to 150 km/h (70-81 kt,
68-93 mph) for higher all-up masses. At higher towing speeds and low all-up
masses, i.e. above about 150 to 160 km/h (81-86 kt 93-99 mph), flap setting
"-1" or "-2" should be used (see diagram below). With these settings, speeds up
to V are covered by the elevator trim.
T
0
0
GROUND RUN
Only small control surface deflections are necessary to keep station behind the
tug.
In gusty conditions or when flying into the propeller slip stream of a powerful
tug, correspondingly greater control stick movements are required.
At lower speeds the undercarriage may be retracted during the tow; this is not,
however, recommended at low altitude, because changing hands on the stick
could easily cause the powered sailplane to lose station behind the tug.
When releasing the tow rope, pull the yellow T-shaped handle fully several
times and turn only when definitely clear of the rope.
November 2003
Revision --
31
27
50
+2
+1
LIFT-OFF
62 75
54 65
100 120
+1
0
0
ON TOW
FLIGHT MANUAL
93 112
81 97
150 180
HIGH MASS
-1
-1
LOW MASS
-2
mph
kt
km/h
LBA-app.
4.5.1.2