Abstract: A horizontal axis wind turbine includes a vertically extending tower 117 having a rotatable long shaft 121. A bottom end of the long shaft drives an electric generator 122 and a top end of the long shaft is connected to a power output gear assembly of a bearing tooth angle drive 120. The power output gear assembly is engaged with a power input gear in the bearing tooth angle drive 120. The power input gear is connected by a drive shaft 86 through a preferably planetary gear drive 119 to blades 106 of a wind turbine to receive power from the wind turbine and to deliver torque to the long shaft 121 to drive the generator 122. The planetary gear teeth preferably have flat surfaces providing contact with related gear teeth.

Abstract: A horizontal axis wind turbine includes a vertically extending tower 117 having a rotatable long shaft 121. A bottom end of the long shaft drives an electric generator 122 and a top end of the long shaft is connected to a power output gear assembly of a bearing tooth angle drive 120. The power output gear assembly is engaged with a power input gear in the bearing tooth angle drive 120. The power input gear is connected by a drive shaft 86 through a preferably planetary gear drive 119 to blades 106 of a wind turbine to receive power from the wind turbine and to deliver torque to the long shaft 121 to drive the generator 122. The planetary gear teeth preferably have flat surfaces providing contact with related gear teeth.

Abstract: A combination solar roof collector and roofing system includes a plurality of discrete small overlapping tempered glass panels of a polygonal shape which do not require exterior molding around individual panels to provide weatherproofing. The overlapping tempered glass panels are applied like ordinary roof shingles to naturally shed water on a roof. Elastomeric moisture proof caulking is provided between the panels. The construction of solar collectors is conformable to any existing roof shape or dimensions by using specially cut perimeter glass panels. The panels are held in place by spacer fastener clips that support the glass panels and hold each panel down to resist uplift forces in strong winds. The glass panels support the weight of a person, do not require any reinforcing of the roof structure, and can be individually removed and replaced to perform any repair or adjustment to the solar panels underneath.