which of the following statements is correct concernign available astern powr for diesel main propulsion systems?
A.
Astern power is to be provided in a sufficient amount to secure proper control of the ship in all normal circumstances
B.
The astern powr of the main propelling machinery is to provide for continuous operation astern at 60% of the ahead rpm at rated speed.
C.
For main propulsion systems without reversing gears, controllable pitch propellers or electric propulsion drive, running astern is not to lead to overload conditions.
D.
Astern power available will be equal to ahead power when controllable pitch propellers are utilized, thus discounting the need for increased operating parameters.