Hi bro this is a MI-26 and is the largest helicopter in the world.nowadays iguess only 5-6 are in working condition and two of them came to Pakistan for rescue service after oct 8 earthquake.I went to abbotabad which was at that time Base camp for all the operations ineffected areas and there i saw them with my bare eye and they were huge imean there were only two standing in the whole golf course and there height was about 2-3 storied building.there were army personnel standing everywhere and they were not leting anyone to take pics so it was really a great scene to see such a huge thing.