Abstract: A rotor blade for a rotary wing aircraft includes a leading edge and a trailing edge defining a chordwise direction. The leading edge defines a forward end of the rotor blade and the trailing edge defines an aft end of the rotor blade. The rotor blade has a center of gravity and an aerodynamic center along the chordwise direction. The center of gravity is aft of the aerodynamic center.

Abstract: Photosensitive materials are described which may be used in a variety of applications such as making dry transfer materials, resist masks, printing plates and silk screen stencils. The material consists of two carrier sheets may be peeled apart and which are laminated together via at least two interlayers viz. a photosensitive layer and an image forming layer. Prior to exposure, if the carrier sheets are peeled apart the carrier sheet adjacent the photosensitive layer separates wholly from it leaving both photosensitive layer and image forming layer on the other carrier sheet. After exposure, if the sheets which are peeled apart the whole of the photosensitive layer and at least part of the image forming layer remains attached to the carrier sheet adjacent the photosensitive layer.By incorporating adhesive in or adjacent the shearable image forming layer, the photosensitive material may constitute a material from which dry transfers may be manufactured simply by imagewise exposure and peeling apart.

Abstract: A method of making signs is disclosed in which a photographically sensitive material is imagewise exposed and developed. The developed image is so constituted that, under the action of heat and pressure, it may be made to adhere to a surface of a transparent or translucent sheet, e.g. of plastics or glass, to form a sign in which the legend is visible through and protected by the sheet. In order to render the legend more visible, a coating or layer may be applied over the legend which accordingly forms a background to the legend as viewed through the sheet.Production of the legend photographically gives very great flexibility in terms of letter size, spacing and the like and allows the production of "one off" signs on a rapid and economic basis. A simple hot press may be used to adhere the legend to the sign sheet.