TM 55-4920-390-13&P
EXAMPLE
The main rotor RPM of the CH 53 helicopter is 185 RPM and it has six blades. Thus 6 x 185 = 1110.
Figure 4-1. Rate Setting Chart.
From the graph we see that the "Multi-turn Dial" should be set to about 540 and the "Position" control to about 1/2 CW.
NOTE
The blank chart in the top right comer of the chart (Fig. 4-1) is provided so the operator can write
in the numbers for various helicopter types he might be using. The information can be erased and
re-written. Use pencil or ball point pen.
NOTE
We assume tracking at 100% RPM which is generally the case. However, tracking can be
accomplished at any other RPM. For example if a ship is so rough that 80% RPM is all that is safe
for a first ground run-up one simply uses 80% of 185 RPM = 148, and proceeds as in C.
d Deploy the 40' Power and Signal Cables and plug the DC power cable into its receptacle (4-3), and signal directly
into the magnetic pickup (4-4, b), or receptacle provided for the purpose.
4-5