Intermediates: These helicopters weigh from 3,500 to 7,000 lb / 1,590 kg to 3,180 kg MGW. Mediums: A little above the mid-range, these are helicopters weighing from 7,000 to 12,500 lb / 3,1880 kg to 5,670 kg MGW. Heavies: Here we find the heaviest helicopters weighing over 12,500 lb / 5,670 kg MGW.