16.100
2002
1
Brequet Range Equation
f
i
t
t
Range
Vdt
=
∫
In level flight at const speed:
LW
=
, Lift = Weight
TD
=
, Thrust = Drag
The aircraft weight changes during flight due to use of fuel.
Relate weight
change to time change:
dW
dW
dt
dt
fuel weight
dt
time
fuel weight T
dt
time
T
=
=−
The quantity:
1
fuel weight
time
T
is known as the specific fuel consumption or sfc.
It has units of:
sfc units =
()
fuel
lb
force
or
lb
hr
force
time
−−
1
f
i
W
W
dW
sfc T dt
V
Range
dW
sfc T
⇒=
−
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 Fall '03
 willcox
 Dynamics, Force, Aerodynamics, Aviation terminology, Breguet Range Equation, Louis Charles Breguet, sfc D W, sfc D

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