The Correct answer is A - Port shaft Ahead Full, Starboard shaft Astern Full The Port propeller will push its side forwards while the Starboard propeller will pull its side back. Combined with a hard turn of the rudder, this will yank the entire ship to Starboard very quickly.

Gunnery Test

The main guns on a Canadian destroyer were 4.7 inch cannons ( the shell had a 4.7 inch or 12 cm. diameter) in single or dual mounts. Their muzzle velocity was 720 metres per second with a maximum range of 15000m. That means that at maximum range the shell would be in the air for 21 seconds. If an enemy ship is running parallel to your ship, at maximum range, with a speed of 30 knots ( 15 metres/second) how far ahead of the ship do you have to aim your guns, given how long the shells will be in the air?

a. 630 metres ahead

b. You aim straight at the ship. The two ship's speeds cancel each other out.

c. 315 metres ahead