04708592 is referenced by 44 patents and cites 25 patents.

A collapsible structure comprising a non-rigid helicoidal sheet braced by light-weight members according to one of several methods. The structure is used in the construction of a wind turbine, wherein a flexible fabric sheet (21) is reinforced by wires (42) sewn into its edges, and may be further reinforced by ribs or battens (30) sewn crosswise into the sheet. One end of the turbine is cnnected via a swivel (24) to a fixed mast (22) while the other end is conneced to the shaft (26) of an alternator. The electrical output of the alternator is connected through a rectifier/regulator (34) to a storage battery (38), thereby providing constant DC power. An alternative method of bracing employs ribs (30) along with counterhelical cables (64).

Title
Helicoidal structures, useful as wind turbines
Application Number
723196
Publication Number
4708592
Application Date
October 28, 1986
Publication Date
November 24, 1987
Inventor
Robin E LeFever
Oakland
CA, US
James S Storey
South San Francisco
CA, US
Robert S Krolick
San Rafael
CA, US
Agent
David Pressman
Assignee
Wind Production Company
CA, US
IPC
B64H 1/22
View Original Source