Yak 18T Flight Operations Manual
Page 14 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.
2.15 Propeller
Symbol V530TA-D35
Type Variable-pitch tractor
Action Direct
Direction of action Left
Diameter 2.4m (7’10”)
Blades 2
Minimum blade angle at 1000mm radius 14°30’±10’
Maximum blade angle at 1000mm radius 14°30’±10’
Range of blade rotation 20°±40’
Weight 40kg+2% (88lbs+2%)
2.16 Main Flight Performance at Standard Conditions
Maximum indicated horizontal airspeed 262km/h, 141kts 162mph
Maximum service ceiling 13,120ft, 4,000m
As standard oxygen equipment is not available in the aircraft, flights at altitudes above
4,000m (13,120ft) are PROHIBITED
. In order to avoid the engine overheating, the climb to
3,000m (9,900ft) should be made at Nominal II (70%) conditions -
• V(limit) = 170km/h (91kts) at ambient temperature near the ground up to +20°C
• V(limit) = 180km/h (97kts) at ambient temperature near the ground over +20°C
Climb from 3000m and higher is allowed to be performed at Nominal I conditions V(limit) =
165km/h (89kts). Time to climb to an extreme high altitude is ≤35 minutes.
2.17 Airfield Performance
Take-off
Weight
Rotation
Speed
Take-off
Run
Take-off
Distance to
10m (33ft)
Length of
Aborted
Flight
Touch-
down
Velocity
with Flap
Landing
Run
Landing
Distance
from 15m
(50ft)
At mean conventional bearing power of soil 8-9 kgf/cm²
1,650kg 135km/h 370m 670m 850m 130km/h 470m 790m
1,510kg 125km/h 265m 540m 650m 120km/h 390m 690m
3,637lbs 73kts 1,214ft 2,198ft 2,789ft 70kts 1,542ft 2,592ft
3,329lbs 67kts 870ft 1,772ft 2,132ft 65kts 1,279ft 2,264ft
At mean conventional bearing power of soil 4-5 kgf/cm²
1,650kg 125km/h 500m 920m 700m 125km/h 350m 650m
1,510kg 120km/h 455m 830m - 124km/h 350m 610m
3,637lbs 67kts 1,640ft 3,018ft 2,297ft 67kts 1,148ft 2,132ft
3,329lbs 65kts 1,493ft 2,723ft - 67kts 1,148ft 2,001ft
Landing without the extended split flap is permitted in the following cases:
• at headwind speed of less than 10m/s (19kts/22mph)
• at crosswind
• in case of faulty flap extension mechanism
• in the cases where the pilot possesses adequate skill
• in the case of aircraft ditching
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