Flight Range And Duration - Kazan Helicopters Mi-17-1V Flight Manual

MI1·17·1B. Flight manual
1.7.4. Flight Range and Duration
The range of flight (R) is determined by the formula:
R = HFR + TOO + LD, where
HFR - horizontal flight range equal to HFF , where
q
q - fuel consumption per kilometre (derived from Table 1.5 for the average
gross weight).
TOO - climb distance at the best climb speed (derived from Table 1.3).
LD - glide distance at the best glide speed (derived from Table 1.4).
The duration of flight (T) is determined by the formula:
T=HFT+TOT+LT, where
HFT- duration of horizontal flight equal to HFF , where
Q
Q - hourly fuel consumption (derived from Table 1.6 for the average gross
weight).
TOT - duration (time) of climb at the best climb speed (derived from
Table 1.3).
LT - duration (time) of glide at the best glide speed (derived from Table 1.4).
The values of the fuel consumption per hour (Q) and per kilometre (q) are de-
termined for a helicopter gross weight being average for the route segment in
question.
The graphs given in Figs 1.5 and 1.6 present the minimum values of fuel con-
sumption per kilometre and hour corresponding to the cruising and economic
speeds versus the helicopter gross weight at various altitudes.
The service range and duration of flight of the helicopter without the dust pro-
tection device, with 5
%
reserve fuel at various altitudes, for two takeoff
weights (11100 kg and 13000 kg) Versus the fuel load (fuel specific gravitY of
0.775 kgllit) are given in Figs 1.7,1.8,1.9,1.10. If the reserve fuel (RF) se-
lected exceeds 5 %, while reading the graphs (fig.1.7-1.10) reduce the fuel
load (TF) by the difference of the reserve fuel (RF - 0.05 TF).
The fuel consumption rates indicated in Table 1.5 and in Figs 1.5, 1.6, 1.11
should be increased:
By 1 % with the dust protection device installed.
By
2 %
with the main and tail rotors anti-icing on.
By 5
%
with the engines air intakes and IGV heaters turned on in flight.
With the KO-50 combustion heater on, the hourly fuel consumption is in-
creased by 8,7 kg/h.
During transportation of external loads the hourly fuel consumption depends
on the value of additional drag developed by the external load.
The additional drag is determined by the cross section of load in the ram air-
flow and the load configuration.
Note: In determining the load cross section in the ram airflow keep in
mind that long loads (tubes, logs, etc.) are positioned crosswise
relative to the ram airflow.
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