Originally Posted by
chrisbl
The fore and aft axis is the roll axis so 30 degrees in fore and aft axis I would have thought was 30 degrees in the roll axis
It is poorly worded, but I think that by "fore and aft axis" they mean 30 degrees fore and aft of a perpendicular line dropped down from the aircraft (i.e.,
aligned with the fore and aft axis not rotated around it.) 60 degrees athwartships would mean 60 degrees left and right of the same perpendicular line.
In this sense, fore and aft is equivalent to pitch and athwartships to roll.
Note that athwartships is not an axis at all but a direction of orientation (across the ship) so 60 degrees athwartships is 60 degrees left and right, i.e., around the roll axis.