The wing covering is attached to the tensioning rib (located at the root of the wing) using screws that go through the black velcro and into the rib.

The tensioning rib is then adjusted to tighten the wing skins by turning 2 long threaded rods (one threaded rod is visible in this photo).

Camera Maker:Canon
Camera Model:Canon EOS 7D
Original Time Taken:2010:06:20 16:33:08
Shutter Speed:1/250 sec
ISO Sensitivity:800
Exposure Compensation:0 EV
Metering Mode:Center Weighted Average
Flash Fired:Compulsory Flash
Focal Length:61 mm