Purkle-chan said:
Well a C130 can carry 19 metric tonnes of equipment, rgouhly half the Bombard. It can also carry, in place of pure cargo, 92 combat ready troops or 64 fully equipped paratroopers.
I've been thinking about the same problem.
The C-130 would be a colossal aircraft (based on length)
If you assume an aircraft can transport one unit the size category smaller, two units two sizes smaller etc. you get a capacity of 64 personnel.
The problem is you get 16 HMMWV sized vehicles which is about 11 more than actual.
I would say an aircraft equipped with cargo bay doors (dedicated transport) could carry a number of vehicles equal to (size difference ^2)/2 and loaded combat troops (size difference ^2) and lightly loaded personnel
1.5 x combat troops. Minimum would be one unit of one size class smaller.
Aircraft without a cargo door could transport personnel/ troops but no vehicles.
As a reality check I'll use the small aircraft I frequently ride in.
It is size medium and normally transports 6-8 passengers in seats. This would be equal to the lightly loaded personnel rating. However we pack in 12 people (nut-to-but) for short trips.