Hirobo have finally produced there version of the Hoverfly the XRB (X-rotation blades) system. This amazing helicopter has contra rotating blades making it extremely stable in flight. This indoor helicopter has an umbilical cord supplying power via a mains transformer.  

 

 

Main Roter:350mm
Length:360mm
Length:62mm(Frame)
Height:140mm
Gear Ratio:8.625:1
Weight:170g(with lama body)
Moter:Mabuchi FK-180SHX2
Rated:1900RPM
Hovering:1600RPM

Main body: Assembled and flight-adjusted.
Specific controller: Specifically developed for XRB series.
Power adapter: Stable long-time flights can be made by simply connecting to a home outlet.
Safety skids: Safe even for beginners to practice.
Spare rotors (12): Attached for replacement.

 

For more information take a look at Hirobo's site http://model.hirobo.co.jp/english/index.html