Changes included reducing the number of full wing ribs and cutting lightening holes in the main spar.

The wing ribs are also made of epoxy and carbon fiber.

The wing ribs were identical and created from a single master die to ensure uniformity.

The fabric covered fuselage was made of welded steel tube with wooden wing ribs.

This caused the wing ribs to disintegrate and the ailerons to break away in flight.

Is this the same as a wing rib?

The wing ribs had a camber of 3.75 in.

The wings were made of wood with aircraft fabric covering and closely spaced wing ribs.

The aircraft was predominantly made from aluminium, with some stainless steel used for the wing ribs, controls and fittings.

To simplify construction, each wing rib is a single piece and slides onto the main spar.