TM 1-1520-238-MTF
5-12
ROTATING COMPONENT
RPM
Main rotor 1 per rev
289
Main transmission sun gear
1,581
Main rotor 4 per rev
1,156
Tail rotor 1 per rev
1,403
Tail rotor 2 per rev
2,806
Tail rotor 4 per rev
5,612
Tail rotor drive shaft (main gearbox to
intermediate)
4,815
Tail rotor drive shaft (intermediate to
90 gearbox)
3,636
Engine output shaft
20,952
Main transmission input shafts
9,841
Main transmission output ring gear
39,882
Tail rotor gearbox gear mesh rate
79,992
Engine N1
42,000
Engine N2
21,000
Figure 5-7.
Rotating Component RPM Table
