Abstract: A siding hammer having a depth control face spaced in front of a striking face of a hammer head of the hammer. The depth control face strikes a substrate into which a fastener is being driven when the fastener has been driven to a predetermined depth of penetration in the substrate to inhibit the fastener from being driven further into the substrate. In certain embodiments, the depth control face is removable to permit the hammer to be used without depth of penetration control. In certain embodiments, the depth control face is adjustable to adjustably control fastener depth penetration. Attachments are also provided for temporarily converting a hammer into a siding hammer.

Abstract: A siding hammer having a depth control face spaced in front of a striking face of a hammer head of the hammer. The depth control face strikes a substrate into which a fastener is being driven when the fastener has been driven to a predetermined depth of penetration in the substrate to inhibit the fastener from being driven further into the substrate. In certain embodiments, the depth control face is removable to permit the hammer to be used without depth of penetration control. In certain embodiments, the depth control face is adjustable to adjustably control fastener depth penetration. Attachments are also provided for temporarily converting a hammer into a siding hammer.

Abstract: A wind turbine comprises a vertical, rotatable shaft and at least one arm, preferably two or more arms, extending radially outwardly from the shaft and rigidly connected thereto at one end. An aerofoil-shaped blade is connected to the other end of each arm and has a normal operating position in which the blade chord line at the point where the blade connects to the arm is generally normal to a longitudinal axis of the respective arm. The leading edge of the blade is disposed at a fixed acute angle relative to the vertical at all rotational speeds of the blade about the axis of the shaft. The arms preferably also have an aerofoil-shape. An overspeed control mechanism is provided to prevent the blade and arm from rotating beyond a predetermined speed limit about the shaft. The control mechanism includes a hinge mount pivotally connecting the blade to its respective arm.