1)what is the range of Pitch angle for standard Helicopters like Bell Uh-1 Huey ?

the max pitch angle is 15 degree,what is the range for helicopters? from 0 to something like 10 degree?

also,a Bell UH -1 Huey,with 2 blade,running at 324 RPM can lift 9500lbs(4200 Kg),

2)is the Max - take off weight of a Heli is calculated with its pitch angle at 0 degree?
if not at what degree of pitch angle?