3/8in = 1 ft
The true scale is 1/32 if you compare 16.5(modeled size) to 528(actual size). To find the in:ft scale, divide the modeled size by the actual size.
In reality:

This works because if you multiply 44ft by 12in you get, as stated, 528 inches. Divide both sides by 44 to get 0.375in (scalar) = 12in(actual)