Inflatable airbag for improving aerodynamic properties of e.g. vehicles improves flow favourable shape and/or ratio of cross-section to length at higher speeds

摘要

The flow-favourable shape and/or ratio of cross-section to length is enhanced by providing one or more airbags which can be filled gradually from a certain speed. A resetting spring can be used to minimize the bag volume when there is no or only slow movement.