Yak 18T Flight Operations Manual
Page 12 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.
2.2.1 General Data
Length 8.39m ±1.6cm (27’6”)
Height 3.4m (11’1”)
LG wheel track 3.12m ±2cm (10’2”)
LG wheel base at rest 195.5cm ±0.6cm
Tyre size (braked wheel tyres of main undercarriage
legs)
50*15cm
Tyre size (nose undercarriage leg) 40*15cm
Distance from tip of propeller blade to the ground (at
parking position with compressed shock struts and
wheel tires)
16cm
Pitch angle at rest 2°
2.2.2 Wing
Section Klark YH
Area, Span 18.8m², 11.16m (36’7”)
Length of mean aerodynamic chord 1.74m (5’8”)
Aspect ratio 6.6
Dihedral (along ¼ chord line) 7°20’
Angle of wing setting 2°
Ailerons area 1.92m²
Aileron deflection (up/down) 22°-1° / 15°-1°
Landing split flap area 1.6m2
Deflection angle of the landing split flap 50° +3° / -1°30’
2.2.3 Horizontal Tail
Area 3.185m²
Span 3.54m (11‘7”)
Elevator area (incl. trim tab) 1.235m²
Dihedral 0°
Elevator deflection (up/down) 25° -1°30’ / 25° -1°30’
Elevator trimmer deflection (up/down) 20° +3°40’ / 20° -1°15’
2.2.4 Vertical Tail
Area 1.7m²
Rudder area 0.982m²
Rudder deflection (left/right) 27°-1° / 27°-1°
2.2.5 Engine Conditions
Engine Condition Power nr. Ground (HP) Crankshaft Speed Supercharger
pressure, mm mercury
column
Specific fuel
consumption g/l,
s.hr
Take-off regime 360-2% (reduced) 99-4% ground
99+1-2% air
Po+125±15 285-315
Nominal I 290-2% (reduced) 82%-84% Po+95±15 280-310
Nominal II 240-2% (reduced) 70% Po+75±15 265-300
Cruise I 0.75 of the measured
power at Nominal II
64% 735±15 (absolute) 210-230
Cruise II 0.6 of the measured
power at Nominal II
59% 670±15 (absolute) 215-235
Idling ≤ 26%
1. Higher power limit and boost pressure behind the supercharger at take-off, Nominal I and II is not limited
2. 99.4% of the crankshaft rotational speed corresponds to 2900rpm
3. Time of continuous engine operation in the take-off regime must not exceed 5mins at peak rpm conditions are
1min at rest conditions
Maximum engine speed (rpm) 101%
Idling (26%) to take-off regime engine acceleration
capacity at V=0, H=0 does not exceed
3 seconds
Maximum over-speeding at acceleration application in
flight (duration does not exceed 1 second and time
during service life – 30 minutes)
109%
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