Gravity, as sensed by the helicopter, would increase and be tilted towards the rear of the plane. (Try, as above, dangling a shoe lace, but add a heavy weight to the end. Not only will it tilt backwards but the "weight" will increase.)
Due to the inherend aerodynamics of the rotor system it will tilt towards the nose of the aircraft and, unless more power is applied to counteract the increase in gravity, it will sink.
OA