CG Range: Single vs Tandem Rotor
A popular myth which has survived for years in spite of facts to the contrary. One example I was able to access online just now:
CH-47D Manual.
Max Weight: 50,000 lbs
CG Range at 50,000 lbs: 322-331 inches= 9 inches
MH-53E Natops
Max Weight: 70,000 lbs
CG Range at 70,000 lbs: 343.9-365.0 inches= 21.1 inches