Page 160 - Aeronautical Engineer Data Book

Aircraft performance 133
Stepped cruise
Climb Descent
Transition to
climb
Landing from
Taxi out and 1500 ft
take-off to
1500 ft and taxi in
Range
Mission time and fuel
Block time and fuel
Fig. 9.1 A typical operational profile

Table 9.1 Operational profile terms
Take off Take-off run available: operational length of
the runway.
Take-off distance available: length of runway
including stopway (clear area at the end) and
clearway (distance from end of stopway to
the nearest 35 ft high obstruction).
V s : aircraft stall speed in take-off
configuration.
V R : rotate speed.
V 2 : take-off climb speed at 35 ft clearance
height.
V mc : minimum speed for safe control.
V LOF : Lift off speed: speed as aircraft clears
the ground.
Transition V TRANS : average speed during the
to climb acceleration from V LOF to V 2 .
: final climb gradient.
Take-off c : best climb angle.
climb 1st segment: first part of climb with
undercarriage still down.
2nd segment: part of climb between
‘undercarriage up’ and a height above ground
of 400 ft.
3rd segment: part of climb between 400 ft
and 1500 ft.
Climb from 1st segment: part of climb between
1500 ft to 1500 ft and 10 000 ft.
cruise 2nd segment: part of climb from 10 000 ft to
initial cruise altitude.
V c : rate of climb.
Cruise V T : cruise speed.
Descent V mc : speed between cruise and 10 000 ft.
(See Figure 9.2 for further details.)
Landing Approach: from 50 ft height to flare height
(h f ).
Flare: deceleration from approach speed (V A )
to touch down speed V TD .
Ground roll: comprising the free roll (no
brakes) and the braked roll to a standstill.