Medium vs Heavy
 

Good day. Apart from wake turbulence categories, what is the dividing line between medium lift transport aircraft and heavy lift transport aircraft?

There isn't one. All Air Forces differentiate in a different manner, some don't differentiate at all.

If you can fit what you want in, it's heavy, if you can't, it's medium!:E

CG

2 Engines-medium; 4-engines-heavy....appx.

Excluding, of course, the Whistling Wheelbarrow

Now you are scoring it on `noise`!..2 Allisons would be enough.

So, you would class a Boeing 777 or an Airbus 330 as a medium and a BAE 146 as a heavy?

VERY approx...

If you're going on noise, the Andover would be considered heavy. :ok:

prOOne,...from a distance,maybe!
if you rate it on noise,then the B-36 has it...

Another distinction, perhaps more purpose-based, is strategic versus tactical airlift. The boundaries, of course, are not inviolable, but take for example the strategic airlifts, C-5's, C-17 and the venerable C-141, versus tactical airlifts like the C-130, C-123, C-7 and many others. Distance, capacity, speed distinguish these.