Abstract: An embodiment of the present invention provides a blocking door that is pivotally disposed on a fixed nacelle of a tiltrotor aircraft for pivoting between a stowed position when a proprotor pylon is in the substantially horizontal position and a protective blocking position in front of the proprotor pylon when the proprotor pylon is positioned in the non-horizontal position. In other aspects, there is provided a blocking door and a method of reducing infrared and/or radar signatures of rotorcraft with a rotatable proprotor.

Abstract: An embodiment of the present invention provides a blocking door that is pivotally disposed on a fixed nacelle of a tiltrotor aircraft for pivoting between a stowed position when a proprotor pylon is in the substantially horizontal position and a protective blocking position in front of the proprotor pylon when the proprotor pylon is positioned in the non-horizontal position. In other aspects, there is provided a blocking door and a method of reducing infrared and/or radar signatures of rotorcraft with a rotatable proprotor.

Abstract: The preferred embodiment consists of a rack comprising two separate parts, a nose piece and a tail piece, mounted in the pockets of either side wall of the bed of a pick-up truck. The nose piece consists of an adjustable, substantially horizontal, support plate with a protruding stud and nut for receiving and securing in place the nose of a personal watercraft. The plate of the nose piece is attached to the end of an extendable shaft mounted in the front pocket of the side wall of the truck, so that the height of the plate can be adjusted to fit the size and profile of the watercraft being carried. The tail piece consists of a similar shaft, mounted in the rear pocket of the same side wall, incorporating a cross member at its top end having a cradle-like concave upper face, preferably shaped like the underside of the watercraft, so as to provide a conforming support bracket for the watercraft.