ENSTROM 280FX OPERATOR’S MANUAL 1-7
Rev. 6
Report No. 28-AC-020 Feb 21/12
3. Ratios
Lower drive pulley to
upper pulley
1.213:1 (3050-2514 RPM)
Upper pulley to main
rotor shaft
7.154:1 (2514-351 RPM)
Engine to main rotor 8.678:1 (3050-351 RPM)
Tail rotor input shaft
to output shaft
1:1
4. Rotor Systems
Number of blades, main rotor 3
Chord, main rotor blade 9.5 in
Disk area, main rotor 804 sq ft
Number of blades, tail rotor 2
Chord, tail rotor blade 4.4 in
Disk area, tail rotor 17.1 sq ft
5. Weight
Designed gross weight 2600 lb
Empty weight 1570 lb
Useful load 1030 lb
C.G. travel 96.3 to 98.0 inches at 2600 lb
92.0 to 98.8 inches at 2350 lb
92.0 to 100.0 inches at 2000 lb
NOTE
Four gross weight/c.g. envelopes apply to this
helicopter (reference Figure 6-1). Each envelope
is associated with a different maximum ceiling
and a different V
NE
limitation (reference Figure 5-
1).
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level of the 280FX Rotorcraft Flight Manual.
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