Yak 18T - Half-Roll; Normal Loop

Yak 18T Flight Operations Manual
Page 47 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.
• Then by means of a fast pedal deviation by 1/3
rd
of its motion towards the roll to be
performed and by a slight pulling of the yoke and simultaneously deflecting it towards the
deviated pedal, impart rolling to the aircraft
• The position the controls and the engine control lever is not changed during X-
rotation/roll
• 20°-30° before the aircraft levelling out, SET the controls for recovery
• After the RECOVERY to level attitude, SET the controls to the NEUTRAL position. The
aircraft X-rotation/roll should be a UNIFORM one
• Rolls are performed actually WITHOUT altitude loss. The procedure of making left and
right rolls is the SAME
8.11 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
• Entry into a half-roll is carried out from horizontal flight at an IAS of 160km/h
• PRODUCE a pitch-up angle of 10° to 15° and then by simultaneous motions of the yoke
and rudder pedals towards the desired half-roll, impart a ROTATION to the aircraft
about an axis with such a rate that the aircraft will be turned upside-down in 2-3
seconds
• When the given position has been achieved, PLACE the rudder pedals in the NEUTRAL
position and by using the yoke STOP the aircraft rotation
• REMOVE boost and by a smooth pulling of the yoke backwards make the aircraft go into
a dive
• On achieving an IAS of 190-200km/h, gradually recover from the dive in such way that
the IAS is 240-250km/h at the end of the dive recovery
• When performing the dive recovery, abrupt motions and excessive pulling of the yoke are
NOT allowed as considerable g-loads will be produced
8.12 Normal Loop
• 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
• Using full engine boost and a small descent, accelerate to an IAS of 280km/h prior to
loop entry
• With a SMOOTH pulling of the yoke backwards, proceed to making a normal loop with a
g-load of +3.5 to +4g
• To PREVENT bank and turn caused by gyroscopic effects and yoke reaction torque,
HOLD the aircraft firm using the left rudder pedal