Vertical Takeoff With Acceleration In Ground Effect; Vertical Takeoff With Acceleration Out Of Ground Effect; Running Takeoff - Kazan Helicopters Mi-17-1V Flight Manual

Mw·17-1B. Flight manual
4.4.1. Vertical Takeoff with Acceleration in Ground Effect
(1) It is allowed to execute vertical takeoff with acceleration in ground effect
in conditions when the helicopter is capable of hovering at a height of not
less than 3 m above the ground with the engines running at limited take-
off power.
The maximum gross weight for takeoff and acceleration in ground effect
is derived from the graph in Fig. 1.3 proceeding as instructed in Section
1.
(2) Before takeoff position the helicopter headed into the wind as possible, lift
it off the ground and perform check hovering. Make sure the instruments
readings are normal and the hovering height is adequate for vertical
takeoff, descend down to a height of 0.5 to 1m and smoothly push the
control stick forward along with simultaneous advancement of power up
to takeoff so as to avoid a main rotor speed drop below 92%. Accelerate
in the ground effect with shallow climb so as to have 60 to 70 km/h lAS at
a height of 20 to 30 m.
Alleviate changes in the helicopter lateral and directional trim, as well as
its tendency to loose height at the initial moment of acceleration by appli-
cation of the flight controls. After acceleration to 60 to 70 km/h lAS pro-
ceed to climb with simultaneous acceleration up to 120 km/h.
(3) In takeoff in crosswind alleviate the sideslipping tendency by deflecting
the control stick into the wind. Takeoff in RH crosswind is more difficult
than takeoff in LH crosswind and requires elevated alertness.
4.4.2.vertical Takeoff with Acceleration out of Ground Effect
(1) The vertical takeoff with acceleration out of ground effect is executed in
cases when the airfield is limited dimensionally and surrounded by obsta-
cles and the helicopter takeoff weight is low enough for hovering out of
ground effect.
The maximum gross weight for takeoff and acceleration out of ground ef-
fect is derived from the graph in Fig. 1.1 following the procedure given in
Section 1.
(2) l3efQretakeQffposition the helicopter headed into the wind as possible, lift
it off the ground and ascend strictly in vertical direction to a height ensur-
ing flyover of the obstacles with a clearance not less than 10 m. In the
course of increasing the collective pitch, monitor the main rotor speed
which may not drop below 92%
Smoothly push the control stick forward to accelerate up to a speed of 20
to 50 km/h and thereafter proceed to climb with simultaneous accelera-
tion up to a speed of 120 km/h.
4.4.3.Running Takeoff
(1) It is allowed to execute running takeoff if the helicopter is capable of hov-
ering at a height of not less than 1 m above the ground with the engines
running at limited takeoff power. In so doing, only the roll and pitch chan-
nels of the autopilot should be engaged.
The maximum takeoff weight for running takeoff is determined in accord-
ance with the instructions covered in Section 1.
(2) Make sure the instruments readings are normal and the throttle control
twist grip is turned to the rightmost position, execute check hovering, land
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