Schempp-Hirth Flugzeugbau Ventus-3T Sport, Руководство по эксплуатации самолета, Страница: 19 / 177

SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Ventus-3T „Sport“ FLIGHT MANUAL
April 2018
Revision –
1.4.3
Propulsion system
The propulsion system was first developed to avoid outlanding or to overcome zero
lift conditions, but it also can be used to realize soaring safaris or for example to
reach a wave after winch launch or aerotow.
Off-field landings may now be safely avoided and even if the system fails, the sink
rate with the power plant extended is only about 197 to 256 fpm ( 1.0 – 1.3 m/s), so
the “Ventus-3T” still has satisfactory performance.
Extending and retracting the power plant is very simple and is done with the aid of
an electrical spindle drive (actuator).
The installed two-stroke engine is started by the windmilling effect of the multi-blade
folding propeller (by OEHLER). Throttle or choke are not required as the engine is
preset to operate at max. continuous power.
The engine is stopped by shutting off the ignition.
After shutting off the ignition the engine control unit automatically manages the
retraction procedure. The power plant is retracted completely after its complete
stop, regardless of the position of the propeller blades as they fold up automatically.
Except of the control unit, the ignition switch, RPM-indicator, decompression handle
and fuel shut-off valve, no other engine controls are to be observed. Available fuel
quantity is displayed in LITER on the engine control unit.
The power plant (engine and propeller) may be removed in short time if necessary.
The Ventus-3T can afterwards be flown in the pure glider configuration with a
reduced weight.
The remaining components of the power plant system (spindle drive, pylon, fuel
tank etc.) remain in the aircraft as the saving in weight is not worth the efforts in
removing/reinstalling them.