sentences:  Sikorsky states that the X2 has the same noise level at 200 knots that a regular helicopter has at 100 knots.Above 200 knots, the rotor speed is reduced from 446 to 360 RPM to keep tip speed below Mach 0.9, the rotor disc is slightly nose-up, and the lift-to-drag ratio is about twice that of a conventional helicopter.Hands-off flying was also successfully performed during flight tests.