Usually AWES are classified into two main categories: drag wings (for flygen) and lift wings (for yoyo). But numerous AWES doesn’t enter these two categories.
If the “two main categories” were defined in regard to the swept area instead of the wing features almost all AWES could be included. Let us try:
1.Stationary swept area (almost all methods excepted yoyo)
2.Swept area going downwind (yoyo).
Stationary swept area refers to torque systems like rotors (flygen like Sky Windpower, or groundgens like Daisy or Rotating Reel), carousels and also crosswind flygens (Makani) which should enter a subcategory as drag power systems, but not as one of the “two main categories”.
Swept area going downwind (yoyo) could remain one of the “two main categories” .
Some researches comprising that below could justify the classification with the swept area, as
- Stationary swept area refers to some AWES reaching theoretically 16/27 Betz limit (with corrections in the details), while
- Swept area going downwind refers to AWES reaching theoretically 4/27 Betz limit, so 1/4, involving in a possible lower power/land use ratio.
Indeed beside it the power/wing area ratio of a wing is certainly important, but the power/space-land use can be still more important, in my opinion.
Stationary swept area (almost all excepted yoyo)
Swept area going downwind (yoyo)
could also be called as:
Torque-based AWE systems
Traction-based AWE systems,
Stationary AWE systems
Downwind AWE systems.