Explanatory notes
… panels). (3) Carrier hoops. (4) Ballonets. (5) Rigid frames and sections thereof. (6) Stabilisers and rudders . (7) Propellers for dirigibles . (II) Parts of … not movable (ailerons, slats, spoilers, flaps, elevators, rudders, stabilisers, servo-tabs, etc.). (4) Nacelles, …