Here's a quick and dirty DPS comparison for you guys.
Corsair %DPS
Cannon: 380%*4*1.2/.69 = 2643%/s
Rapid: 160%*1.2/.12 = 1600%/s
Assume you use Cannon x seconds for every 90 seconds of Rapid.
Weighted average: [2643 - 93913/(x+90)]%/s
Buccaneer %DPS
Demolition: 400%*8/2.55 = 1254%/s
Barrage + DU: (230%*10+290%*2)/3.24 = 889%/s
Assume you use Demolition and Barrage + DU equally over time.
Weighted average: 1072%/s
Now, adjust for differences in damage range. Since this is a quick and dirty approximation, I'll take 4.8/3.6 (the main stat multipliers) and 200/220 (to account for the absence of bullet ATK) and multiply them by Buccaneer damage. This simplifies to a 40/33 modifier.
Final weighted average: 1299%/s
Now we set them equal.
1299 = 2643 - 93913/(x+90)
93913 = 1344(x+90)
69.87 = x+90
-20.12 = x
The Corsair would have to stay on the battleship for at least -20.12 seconds to match the Buccaneer over time.
I'm not even trying to sound sarcastic.
Corsair %DPS
Cannon: 380%*4*1.2/.69 = 2643%/s
Rapid: 160%*1.2/.12 = 1600%/s
Assume you use Cannon x seconds for every 90 seconds of Rapid.
Weighted average: [2643 - 93913/(x+90)]%/s
Buccaneer %DPS
Demolition: 400%*8/2.55 = 1254%/s
Barrage + DU: (230%*10+290%*2)/3.24 = 889%/s
Assume you use Demolition and Barrage + DU equally over time.
Weighted average: 1072%/s
Now, adjust for differences in damage range. Since this is a quick and dirty approximation, I'll take 4.8/3.6 (the main stat multipliers) and 200/220 (to account for the absence of bullet ATK) and multiply them by Buccaneer damage. This simplifies to a 40/33 modifier.
Final weighted average: 1299%/s
Now we set them equal.
1299 = 2643 - 93913/(x+90)
93913 = 1344(x+90)
69.87 = x+90
-20.12 = x
The Corsair would have to stay on the battleship for at least -20.12 seconds to match the Buccaneer over time.
I'm not even trying to sound sarcastic.