WinGD X72DF - Page 55

Marine Installation Manual 2021-08 2-17
2 Engine Power and Speed
2.7 Prohibited operation area
X72DF
Power/speed range for
CMCR [Rx] =
R3 — R4 speed
In Figure 2-10, the engine’s CMCR speed is rated at the R3 — R4 speed. At this
speed, a minimum engine power (point F) of 7.9 % is required. Below this is the
prohibited area of operation for a disconnected propeller.
Figure 2-10 The prohibited operation area (CMCR speed = R3 — R4)
40 50 60 70 80 90 100
[rpm]
110
100
90
80
70
60
50
40
30
20
10
0
5
7
8
CMCR [Rx]
Field A
Engine speed
Engine power [% Rx]
[% Rx]
7.9 [% Rx]
12
11
E
F
Prohibited
operation area
34.527.6 41.4 48.3 55.2 62.1 69
X72DF
SM-0397