Being scale doesn't dictate its size. What the scale is does. Full scale is the largest. I have seen full scale RC helis that were used as drones. The larger the scale, the larger the size. 1/4 scale would be bigger than 1/5th scale for instance. Size depends on the size of the original.

I have seen a scale jet ranger than was about 4 feet tall. Pretty big and hard to haul around. Heres a web site for you to look at some different helis.

http://www.centuryheli.com