Eiri KY PIK-20 E - Takeoff in Aerotow; Takeoff in Winchtow

PIK-20 E Flight manual
A
Takeoff in the rain is prohibited
With wet or frosty wings the takeoff distance is remarkable longer and
the wings must be kept clean and dry before takeoff.
Prolonged flying in the rain may cause wearing of the leading edge of
the propeller and the drag is doubled referred to the given values in
chapter 7: "Performance".
5.12 Takeoff in aerotow
The flaps are recommended to be neutral or +4° down. The trim is
slightly back of central position. During tow +8° down can be used.
Recommended towing speeds are 105 km/h (65 mph, 57 kts) with
370 kg weight and 120 km/h (75 mph, 65 kts) with 470 kg weight.
-12° up deflected flaps are not allowed in aerotow because of high
stall speed and poor controllability at low speeds. Maximum airspeed in
aerotow is 190 km/h (118 mph, 103 kts). Maximum crosswind is 10 kts.
Before coupling the towing wire the pilot should check that the right
towing ring and weak link is used.
5.13 Takeoff in winchtow
The flaps are recommended to be in position +4° down. Negative and
more
than +8° down flap position are not allowed during takeoff be
cause of difficult handling. To get as much height as possible, the take 
off can be made with + 4° down deflected flaps and from 100 m (300 ft)
height use +12° down deflected flaps.
With central C. of G. position and flaps + 4° down the trim should be
in the middle and with +8° flaps 1/3 from the forward position.
Recommended airspeeds are 110 km/h to 125 km/h (68. . .78 mph,
59. . .67 kts). Maximum airspeed in winchtow is 125 km/h (78 mph, 67
kts).
Maximum crosswind is 10 kts.
Before coupling the towing wire the pilot should check that the right
towing ring and weak link is used. Winch tow is allowed only with the
rear tow hook installation at station 1850 mm.
EIRI KY
y
Kisällinkatu 8
SF-15170 Lahti 17
Revision 2.21.8.-79
page I-28