Power and Power loading Unit
Hello,
I'm at this moment reading a book : Basics of RC Model Aircraft Design of Andy Lennon,
There are some units however i don't know (and then can't understand): The engine disp. (cid) and Power loading (oz./cid). I know what is a power loading but not the term "cid". Could someone help and tell me what does "cid" means and what is the oz./hp equivalent of oz.cid?