TM 55-1510-215-10
Section VI. NORMAL TAKEOFF
7-26. Description.
normal takeoff distances in chapter 7.
Rotate at
recommended rotation speed (V r), establish a pitch
The Takeoff-Normal Chart (fig. 7-10), shows the
attitude that allows liftoff at recommended liftoff speed
ground roll distance and the total distance required to
(Vlof ). When flight is assured, retract the gear and
clear varying obstacle heights at a known free air
establish proper initial climb attitude (obstacle clearance
temperature, pressure altitude and weight.
climb speed (V x) or (best rate of climb speed Vy )
dependent on existing conditions.
7-27. Use of Chart.
e. Wind - All data presented are based on calm
In order to achieve these distances, airspeeds
wind conditions. Since surface wind speed and direction
obtained from the Normal Rotation/Takeoff Airspeed
can not be accurately predicted, all takeoffs shall be
Chart (fig. 7-11), and power set according to the Torque
planned based on calm wind. Distance decreases
Available for Takeoff Chart (fig. 7-9), shall be used.
approximately 1% per knot headwind.
Distance
increases approximately 3% per knot tailwind.
7-28. Conditions.
f. Runway - Runway conditions for this chart are
a. Engine - Both engines operating with takeoff
based on a dry, hard-surface, level runway. Conditions
power and 2200 RPM with torque set according to the
other than these will vary aircraft takeoff distances.
Torque Available for Takeoff Chart (fig. 7-9).
Ground roll distance decreases approximately 5% per
1% downhill gradient. Ground roll distance increases
b. Flaps - UP.
approximately 7% per 1% uphill gradient.
c. Landing gear - UP (after liftoff).
NOTE
d. Technique - Apply maximum allowable takeoff
Refer to the Single-Engine Climb
power and accelerate on the runway. Takeoff power
Chart (fig. 7-15), to determine if
must be applied prior to releasing brakes to obtain the
adequate performance is available in
the event of engine failure during
takeoff.
7-22
