2687435-A2 is referenced by 1 patents.
[en] An air vehicle has a gas-filled hull (1) of flexible sheet material. Strakes (7) extend along an exterior of the hull, each strake comprising a gas-filled tube (10) of flexible sheet material. A rigid board (12) may project outwardly from the gas-filled tube (10) and away from the vehicle. A further layer of flexible sheet material (13) may extend from one side of the strake (7) over the board (12), to another side of the strake, to provide a strake (7) generally triangular in cross section.