Found this on a board for springsharp so it *should* work for carriers.

By Rick Robinson

"Carriers.

Spring Style is designed for ships armed

primarily with guns, but carriers become important from the end of World War I on. Here is a method for simming carriers:

Design the ship as you normally would. Put in as much

miscellaneous weight" as you can - that will usually

determine how big an airgroup your CV can carry. Now,

get out your pocket calculator. You'll make two pretty simple calculations, each of which gives a possible airgroup limit.

1) Take the square root of miscellaneous weight; e.g., if miscellaneous weight is 10,000 tons, the eight-based limit for your carrier is 100 aircraft. (In addition, allow at least 25 tons per aircraft, i.e., if miscellaneous weight is just 100 tons, your ship can carry 4 planes, not 10.)

2) Multiply length x beam (both waterline) and divide by 750; e.g., if your CV is 900 ft x 100 ft, the space limit is 120 aircraft.

For the metric gang, divide by 70 instead; if your CV is 280 metres x 30 metres, the size limit is also 120 aircraft.

Use waterline dimensions (if available), NOT flight deck dimensions; they can vary a lot more, and we want a consistent rule.

Your carrier's airgroup is whichever number is LOWER.

So in the example above, your CV has an airgroup of 100

aircraft. (That is for WW II or earlier planes. For postwar CVs with jets, I'd estimate about 2/3 of the airgroup calculated by this method.) Usually, the weight rule gives a lower number of planes and thus sets the limit; the size limit will usually apply to CVEs converted from merchant ships with a great deal of miscellaneous weight.

Conversions: If you convert a battlecruiser, etc., to a CV, follow the same basic procedure. Start with the original ship, modify main guns, armor, etc., put in miscellaneous weight and there is your carrier.