Sikorsky X2 Flying with Propulsor on

The X2 advancing blade helicopter has returned to flight, and this time, the propulsor is hooked up.

It only reached 52 kts in its initial flights around the end of last month, but Sikorsky is hoping to reach 250 kts by the end of the year.

So far, there have been no game stoppers, and, unlike its ABC helicopter predecessor from the 1970s, vibrations appear to be very low.

I would assume that at some point, they will be adding some sort of shroud on the rotor masts to reduce drag a bit.