I made a simple excel for calculating ribs. If I can find out how to share this excel document it will work. Till then visit my website at McSpuds.net and go to the how to section. how to section Just place your ship's length in inches in A3....
http://www.southeastattacksquadron.org/ribcalculator.shtml Brian K's version for MWC. Is also valid for IRC & other fast gun formats. I'm not familiar w/ big gun rules, so....