very cool!
A sort of "miniature" version of how they run the full-size unlimited hydroplane races- once the boats are dropped into the water by cranes the (full-size) helicopters power-up and ultimately shadow the racing action over-head, directly above, providing a birds-eye view (ie. television coverage, etc.,...). Funny, as a spectator the helicopter's are very apparent, however watching on TV you don't really "feel" their presence