Fuel; Horizontal Flight Fuel - Kazan Helicopters Mi-17-1V Flight Manual

MI1-17-1B. Flight manual
The helicopter range and duration of flight at a selected load depend on
the helicopter fuel load and flight condition characterized by altitude and
indicated airspeed (lAS).
The helicopter load and fuel quantity determine the helicopter actual take-
off weight which should not exceed the maximum takeoff weight derived
from the graphs for the selected takeoff procedure and actual ambient
conditions at the takeoff field (Ref. Figs 1.1, 1.2, 1.3, 1.4).
1.7.2. Fuel
The total fuel load (TF) is determined by the formula:
TF
=
TOW - OZFW
+
GF, where
TOW - helicopter takeoff weight (less fuel used on the ground);
OZFW - operational weight including all operational items less fuel (Le. opera-
tional zero-fuel weight);
GF - fuel used for engines ground run determined by the engine ground run
time and average fuel flow rate (7 kg/min).
The total fuel load (the amount of fuel before takeoff) is equal to the volume of
fuel filled in liters multiplied by the fuel specific gravity.
If the fuel actual specific gravity is unknown, use the design values depending
on the fuel grade.
The helicopter fuel system capacity for various variants of fueling, the total fuel
load with the tanks full and for various fuel grades, as well as the design val-
ues of specific gravity for each grade are given in Table 1.2.
GF
=
35 kg is assumed for calculation with the engines running before take-off
for 5 minutes (starting, warming up, ground testing and taxiing to take-off posi-
tion).
Table 1.2
Capacity of Fuel Tanks and Design Specific
Gravity of Each Fuel Grade
Capacity of tanks filled,
Total fuel load, ko
Tanks T-1 fuel of 0.8 kg/lit TC-1 orT-7fuel of 0.775
liters
specific cravitv
ko/lit specific cravitv
Main tanks and service
2615 2092 2026
tank
Main tanks, service tank
3530
2228 2735
and one auxiliarv tank
Main tanks, service tank
4445 3556 3445
and two auxiliarv tanks
Main and service self-
2585 2068 2003
sealino tanks
1.7.3. Horizontal Flight Fuel
Fuel consumed in horizontal flight (HFF) is determined by the formula:
HFF
=
TF - GF - TOF - GLF - RF - UF, where
TOF - fuel used for takeoff, establishing of steady flight condition and climb
(derived from Table 1.3).
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