(pounds) (inches) (lb/inches)
Basic Empty Weight
Pilot
Fwd Passenger
Right Fwd Baggage
Left Fwd Baggage
Right Aft Passenger
Left Aft Passenger
Right Aft Baggage
Left Aft Baggage
Totals with Zero Fuel
Main Fuel Tank
Aux Fuel Tank
Totals with Fuel
CG
1,400
170
250
185
50
50
2,105
184
110
2,399
107.75
49.5
49.5
44
44
79.5
79.5
79.5
79.5
106
102
93.8
150,850
8,415
12,375
0
0
0
14,708
3,975
3,975
194,298
19,504
11,220
225,022
Longitudinal
2,500
2,300
2,100
1,900
1,700
1,500
CL
91 93 95 97 99 101 103
260
256
252
248
244
240
236
232
1,100
1,050
1,000
950
900
850
800
750
700
Fuselage Station (CM from Datum)
Gross Weight - lb.
Gross Weight - KG
Fuselage Station (in. from Datum)
Main
Rotor
Most Fwd
CG with
Full Fuel
Longitudinal
(Point A)
Figure 7-9. Use the longitudinal CG envelope along with the computed CGs to determine if the helicopter is loaded properly.
Figure 7-10. Computed Lateral CG.
Weight Arm Moment
(pounds) (inches) (lb/inches)
Basic Empty Weight
Pilot
Fwd Passenger
Right Fwd Baggage
Left Fwd Baggage
Right Aft Passenger
Left Aft Passenger
Right Aft Baggage
Left Aft Baggage
Totals with Zero Fuel
Main Fuel Tank
Aux Fuel Tank
Totals with Fuel
CG
1,400
170
250
185
50
50
2,105
184
110
2,399
0
12.2
–10.4
11.5
–11.5
12.2
–12.2
12.2
–12.2
–13.5
13
–1.6
0
2,074
–2,600
0
0
0
–2,257
610
–610
–2,783
–2,484
1,430
–3,837
Lateral
7-8
Lateral CG is often plotted against the longitudinal CG.
[Figure 7-11] In this case, –1.6 is plotted against 93.8,
which was the longitudinal CG determined in the previous
problem. The intersection of the two lines falls well
within the lateral CG envelope.
CL
260
256
252
248
244
240
236
232
8R
6R
4R
2R
0
2L
4L
6L
8L
Fuselage Station (CM from Datum)
Lateral - in.
Lateral CG - CM
Fuselage Station (in. from Datum)
Lateral
3R
1R
1L
3L
CL
Main
Rotor
(Point A)
91 93 95 97 99 101 103
Figure 7-11. Use the lateral CG envelope to determine if the
helicopter is properly loaded.
8-1
Your ability to predict the performance of a helicopter
is extremely important. It allows you to determine
how much weight the helicopter can carry before
takeoff, if your helicopter can safely hover at a specific
altitude and temperature, how far it will take to
climb above obstacles, and what your maximum
climb rate will be.
FACTORS AFFECTING PERFORMANCE
A helicopter’s performance is dependent on the power
output of the engine and the lift production of the
rotors, whether it is the main rotor(s) or tail rotor. Any
factor that affects engine and rotor efficiency affects
performance. The three major factors that affect performance
are density altitude, weight, and wind.
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