Yak 18T Flight Operations Manual
Page 48 of 82
Disclaimer: This manual is to be used as a reference only, it is based on translated Yak 18T Flight Operations
Manuals and has not been approved by the Yakovlev Design Bureau or any other authority.
•
When the angle of climb is increased by more than
20°-30°
, gradually
INCREASE
the
rate of the yoke motion until the aircraft starts its transition to the upside-down position
•
After this,
REDUCE
the pulling (pull forces) of the yoke. At the top-most point of the
normal loop, the yoke is pulled
SLIGHTLY
just so as to provide nose-down pitching
•
If signs of aircraft
INSTABLITY
are present at the top-most point of the loop, move the
yoke slightly
FORWARD
with a subsequent pulling
BACKWARDS
to create the required
stabilisation effect
•
As soon as the aircraft passes the line of horizon, smoothly reduce the boost to the
minimum value
•
WEAKEN
the depression exerted on the left rudder pedal and feel the aircraft's
“pushing” over
•
When the
VERTICAL
dive position is achieved, slightly PUSH the yoke forward in order
to provide a smooth dive recovery
WITHOUT
an abrupt transition to large angles of
attack
•
When the diving IAS is
190-200km/h
, initiate the recovery to level flight in such a way
as to obtain an IAS of
270-280km/h
8.13 Half-Loop and Half-Roll
•
BEFORE
entry into this manoeuvre, study the surrounding airspace to make sure that no
other aircraft are flying in proximity of your aircraft, that you will remain clear of cloud,
congested areas and that sufficient altitude is available should the manoeuvre is not
successful. Select the necessary ground reference points for completing the manoeuvre.
Special attention should be paid to the space under the aircraft
•
PRIOR
to commencing this manoeuvre, achieve
HORIZONTAL
flight and select the
intended recovery ground reference point
•
Perform acceleration with full engine boost and a small descent. The initial indicated
airspeed of the half-loop is
300km/h
•
When the designated speed has been
ACHIEVED
, perform the first half loop by pulling
the yoke backwards more vigorously (i.e. with a g-load of +5g) than in the case of an
inside loop
•
Continue with the pull until a vertical angle of 60° has been achieved, then lower the g-
load to about +3-4g
•
On approaching the top point, with the aircraft in the inverted position and its nose-over
does not reach the horizon line by 5°-10° (the IAS must be at least
150km/h
)
•
Now
DEFLECT
the yoke and rudder pedal towards the desired side, turn the aircraft
about its longitudinal axis by 180° to perform the half-roll
•
SET
the controls for recovery at
20°-30°
before recovering to level flight
•
As soon as the aircraft's
LEVEL
attitude is achieved,
SET
the controls to the
NEUTRAL
position
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