Physics of autogyro rotors - or that of windmills at an angle of incidence to the wind

Several topics on this forum touch on autogyros:

Bryan Roberts' Gyromill (Sky WindPower)

Crosswind gyroplane?

Toward the worst AWES

This topic is to collect resources on the physics of autogyro rotors. Or on the physics of a windmill (not necessarily wind turbine) at an angle of incidence to the wind.

THE AUTOGYRO FOR SHIP PROPULSION.pdf (1983, 8 pages) (4.9 MB)

NASA/CR—2003–212799 | An Overview of Autogyros and The McDonnell XV-1 Convertiplane (2003, 284 pages)

The Autogyro Rotor as a Sail.pdf (1934, 5 pages) (1.5 MB)

This topic is a nice excuse to post this:

Horizon - The Chopper (BBC2 Documentary, 1982)