If you want to skip the build up to the aerial crash, fast forward to about the 1:15 mark on the video to see an 80-inch RC plane with 50cc gas engine hit a RC helicopter and then immediately nosedive to its destruction. The plane clips one of its wings when it hits the chopper and immediately spirals down and slams into the ground. Gnarly.
Also, really good camera work, guy. The World Models 80" Mitsubishi Zero with a Fuji-Imvac 50 cc gas EI engine and 450 size electric helicopter crash was captured at Santa Clara County Model Aircraft Sky Park. The drones are fallin'. [YouTube via The Awesomer]