However, the rear rotors spin on its own quite fluidly. The belly of this craft is open, showing its legs and head. However, you will be unable to tell unless you're looking right at the belly. He has 2 plastic wheels for movement, although it is not useful. There is also a 'cage' on the copter's belly. This is to house Blackout's partner, Scorponok.
Picture Source:Google
Info Source:tformers.com