In twin-screw engine installations while going ahead,maneuvering qualities are most effective when the tops of the propeller blades both turn().
A、to starboard
B、outboard from the center
C、to port
D、inboard toward the center
A、to starboard
B、outboard from the center
C、to port
D、inboard toward the center
A、one engine ahead and one engine astern,with full rudder B、one engine ahead and one engine astern,with rudders amidships C、both engines ahead,with full rudder D、both engines astern,with full rudder
A、Go ahead on both engines with the rudder hard to one side,if on a twin-screw vessel B、Back down with the rudder hard to one side,if on a single-screw vessel C、Take advantage of the tendency to back to port,if on a twin-screw vessel D、Turn so that the tendency to back into the wind can be used,if on a single-screw vessel
A、A.one engine ahead and one engine astern,with full rudder B、B.one engine ahead and one engine astern,with rudders amidships C、C.both engines ahead,with full rudder D、D.both engines astern,with full rudder
A、permits the rudder to move faster B、generates more power C、can turn without using her rudder D、can suck the water away from the rudder
A、one engine and a steering oar B、both engines at the same speed C、one engine at a time D、one engine running at reduced speed and controlling the vessel with the other
A、forward spring line and going slow ahead on the inboard engine B、after spring line and going slow astern on the outboard engine C、forward spring line and going slow ahead on both engines D、forward spring line and going slow ahead on the outboard engine
A、correct trim will be obtained more easily B、drag effect will be cancelled out C、side forces will be eliminated D、speed will be increased