Abstract: A trailer tipper is disclosed having a sub-frame, a deck pivotally secured to a rear portion of the sub-frame, and means for raising the deck relative to the sub-frame. An adjustable backstop assembly is provided in embodiments. In one embodiment, the adjustable backstop includes cushioning members for cushioning an impact of a trailer with the adjustable backstop. In other embodiments, a safety hoop is generally centrally located on the deck to maintain the trailer on the deck.

Abstract: In a preferred embodiment, a tail rotor assembly for a helicopter, which includes: a first rotor disposed on a first side of the distal end of a tail boom of the helicopter and rotatable in a first geometric plane; and a second rotor disposed on a second side of the distal end of the tail boom, the second rotor being rotatable in a second geometric plane.