Abstract: The present invention is a hidden fastener for securing deck boards to supporting joists. The fastener consists of a head shaft; one or more blades attached to the head shaft oppositely, if there are two blades, at the top outer surface of the head shaft and being formed to penetrate into deck boards, whether wood or composite, when rotated therein to; a driver attachment being located in the upper portion of the head shaft and shaped to fixedly hold a driver for turning the head shaft and one or more blades; and a fastening device in a lower portion of the head shaft. The fastening device may be an integral part of the head shaft or a screw mounted in lower port of the head shaft. After the location of the fastener is defined on the joist, the fastening device is driven into the joist to hold the head shaft thereto. One or more adjacent boards are butted against the head shaft.

Abstract: The present invention is an improved wind turbine having multiple blades mounted in a turbine rotor. The tips of the blades are attached to a blade ring. The blade ring holds the blades in place, provides support to the rotor in a stator/guide track, provides a location for energy transfer either by mechanical means or electrical means, and provides at least one location for means for reducing friction between the rotor and the stator. The rotor may further include a device for controlling the direction of the rotor axis based upon the wind direction such as a rudder. The stator/guide track holds the blade ring, in a frictionless manner, and provides locations for levitation devices as well as energy transfer devices that complement devices on the blade ring. The guide track is mounted to a pedestal secured to the ground. The pedestal may also include devices for controlling the direction of the rotor.