MSFS 2024 · General Aviation

DHC-6 Twin Otter Quick Reference

V-SPEEDS

SpeedValueDescription
Vs058 KIASStall - flaps full, landing config
Vs180 KIASStall - flaps up, clean config
Vr70-80 KIASRotation (weight dependent)
Vx87 KIASBest angle of climb (flaps up)
Vy100 KIASBest rate of climb (flaps up)
Va130 KIASManeuvering speed (max weight)
Vfe (Flaps 10)103 KIAS105 CAS - max speed extending to flaps 10
Vfe (Flaps 10 to 37.5)93 KIAS95 CAS - max speed beyond flaps 10
Vmc64 KIAS66 CAS - minimum control speed, flaps 10
Vmo (SL to 6,700 ft)166 KIAS170 CAS. Floatplane limited to 160 CAS
Vmo (10,000 ft)156 KIASReduces with altitude
Vmo (20,000 ft)126 KIAS112 KIAS at 25,000 ft
Va / Vb132 KIAS136 CAS - maneuvering and gust penetration, to 18,000 ft
Vref (Flaps 20)80 KIAS at 12,300 lbs70 kts at 9,500 lbs - see weight table
Vref (Flaps 37.5)74 KIAS at 12,300 lbs64 kts at 9,500 lbs - see weight table
Go-Around (Flaps 10)88 KIAS at 12,300 lbs1.3 x Vs - 75 kts at 9,500 lbs

POWER SETTINGS

PhaseSetting
Takeoff / Max Continuous50 PSI torque / T5 725 degC / Ng 101.6% / Np 96%
Max Climb / Max Cruise50 PSI torque / T5 695 degC / Np 96%
Normal Climb75-96% Np as desired
Idle~52% Ng at ISA / T5 limit 660 degC
Generator load on groundIdle Ng + 15% when load exceeds 0.5
Intake Deflector Extension80% Ng minimum
Hot and high takeoffStabilise at 85% Ng before takeoff power
Max Reverse50 PSI (1 min) / T5 725 degC / Np 91% +/- 1

FLAP SCHEDULE

SettingMax SpeedUse
0 deg (UP)AnyCruise / Climb
10 deg<= 103 KIASNormal takeoff / Go-around
20 deg<= 93 KIASSTOL takeoff / Recommended landing setting
37.5 deg (FULL)<= 93 KIASLanding - runway length limited only

ENGINE LIMITS

ParameterValue
Engine2x PT6A-27, 620 SHP
Max T5 (Start, 2 sec)1,090 deg C
Max T5 (Takeoff / Max Continuous)725 deg C
Max T5 (Max Climb / Cruise)695 deg C
Max T5 (Idle)660 deg C
Max T5 (Acceleration, 2 sec)825 deg C
Max Ng101.6% (102.6% acceleration)
Max Np96% (110% acceleration)
Max Torque50 PSI (68.7 acceleration)
Min Ng for Fuel Introduction12%
Idle Ng~52% at ISA
Oil Pressure80-100 PSI (40 min at idle)
Oil Temp-40 to 99 deg C

KEY NUMBERS

ParameterValue
Usable Fuel (fuselage)2,268 lbs (1,029 kg)
Forward Tank181 USG - feeds the LEFT engine
Aft Tank197 USG - feeds the RIGHT engine
Optional Wing Tanks37 USG each (222 lbs total)
Low Level Warning75 lbs forward / 110 lbs aft
MTOW12,500 lbs (5,670 kg)
Hydraulic Pressure1,300-1,600 PSI
Start OrderRIGHT engine first
Prop levers to MAX RPMNo later than 500 ft AGL on approach
Flaps 20 landing distance1.3 x the flaps 37.5 distance
Icing onsetVisible moisture below +5 deg C OAT
Max Passenger Capacity19 passengers