Division 2.3 Control area for engines tested on NRSC cycle E3

These engines are mainly operated slightly above and below a fixed pitch propeller curve. The control area is related to the propeller curve and has exponents of mathematical equations defining the boundaries of the control area. The control area is defined as follows:

Lower speed limit

0,7 × n _{100 %}

Upper boundary curve

%power = 100 × (%speed/90)^3,5;

Lower boundary curve

%power = 70 × (%speed/100)^2,5;

Upper power limit

Full load power curve

Upper speed limit

Maximum speed permitted by governor

where:

• %power is % of maximum net power;

• %speed is % of n _{100 %}

• n _{100 %} is the 100 % speed for the corresponding test cycle.