I saw your post about the big helecopter that was used for the mining industry, and yes it it huge, but it is not the biggest by a long way. I have linked a picture to a machine made by the same people which has two twin engined heads and a body larger than a boing 737! Just check out the size of the fighter jets under its wing for a scale!
Click on the Link Below. The naration is in French but I think most of you will understand..