SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Ventus-3M „Performance“
FLIGHT MANUAL
March 2019
CS 22
Revision –
4.5.7.1
4.5.7
Approach
Power plant retracted / power plant removed
Normal approach speed with airbrakes fully extended, flap position
L
and wheel
down is 105 km/h (56 kts, 65 mph), or 115 km/h (62 kts, 71 mph) at maximum
permitted all-up mass.
The yellow triangle on the ASI at 110 km/h (59 kts, 68 mph) is the recommended
approach speed for the maximum all-up mass without water ballast
With fully extended airbrakes and maximum all-up mass, the L/D is around 1 : 6.9
at 18 m wing span.
The airbrakes open smoothly and are very effective. There is no noticeable
change of trim.
Caution:
For the approach or for the landing, especially at cross wind, the flaps can also
be set to “+2” or “+1” to improve the effectiveness of the ailerons and the
handling of flaps for approach and landing. The approach speed quoted
previously should then be increased by at least 5 km/h (3 kts, 3 mph).
Side slip
Side slipping is very effective landing aid, please also see page 4.5.7.2.
Side slips in 18 n configuration may be conducted in a straight line with up to 80%
of the rudder travel, resulting in a yaw angle of about 40° and a bank angle of
about 15 to 25°.
Due to a control reversal a significant amount of opposite pedal pressure is
required to keep the rudder displaced.
To return to level flight, normal opposite controls are required.
Side slipping causes the IAS to read lower than the actual speed. Side slipping
was tested up to an IAS of 150 km/h (81 kt, 93 mph).
