The power is about 10kW / 15 Hp, that's about 110 km/h or 72 mph max speed (not on hills). The engine and the swingarm are one part (exactly as on the Helix, only a little bit longer)
It is a nice bike when it works. Be prepared to invest in parts and time if you want to keep it working. Not exactly the everyday commuter bike (then you are better of with a helix).