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mj12games.com/forum → Grand Fleets → Calculating Light Guns Firepower
Hi All,
How do you calculate the firepower for light guns?
I'm working on some ship stats for the First Sino-Japanese War and some of the light gun types used are not covered in the ship conversions section of the rules. When I use the firepower calculation I get results that are far higher than those already listed. Please see below an example of my calculations.
<IMG src="https://i.imgur.com/Q0H0sKA.png">
</IMG>
Any help much appreciated.
Thanks, George
You don't calculate the Firepower for light guns like you do for heavy guns.
Just multiply the number of each size by the Firepower rating given in the Light Guns Chart page 37 in the GF rule book.
Gun Firepower
37mm/1lb 1.0
40mm/2lb 1.3
47mm/3lb 1.6
57mm/6lb 2.0
76mm/12lb 2.7
88mm/15lb 3.0
88mm/20lb 3.3
Hi Paul,
Thanks for the reply.
Okay, I can use those factors to calculate the Firepower for most light guns but what should the Firepower be for the 50mm/4lbs & 70mm/9lbs? The size/weight of these guns is not listed on that table.
Thanks, George
The calculation for light gun firepower is (projectile weight)^0.4
So, your 4# gun would have a value of 1.7 and your 9# gun would have a value of 2.4.
Brilliant, thanks 
George
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