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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