It would be easier to just ask for the base speeds of the ships, instead of the hidden value you highlighted which isn't even legal to extract from game files anymore I think. You could try dig up LordKelvins old thread from the old forum section, think he listed every USN ships 'c' value.

EDIT: Infact I even went and dug it up for you.

Values are Iowa 10.7267, Montana 13.45, Nebraska 15.5635. Though these might be out of date.

You know, if you have all the other values, and the base speed, you can derive the constant without breaking NF rules of extracting the values. Just a thought. 

Also, could you explain to me why this matters? The base speed is a given value that is widely accessible, why go though the trouble of using fractional denominators? 

   Benser33, thank you very much, this is just what I was looking for.

   OmegaViper,but no one and nothing is going to explain why and for what

Well, in extreme cases, can torment if you do not get an answer to that expected

 
Thanks for your answers