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The Future Flight Standards Hub is designed to accelerate the development of Future Flight demonstrators and wider industry innovation based on emerging best practice, knowledge sharing, and standards support.

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  • BSI Flex 1903 v1:2023-08 formally released

    This is an interactive version 1 of BSI Flex 1903 v1.0:2023-08. The aim of the standard is to create a lexicon of standard terms and acronyms used in this sector.

    We welcome your engagement and comments on this version to help inform the development of the next version. Comments on clauses or terms in the standard should be made via the BSI Standards Development Portal. We would also welcome general feedback including what terms could be considered for future versions and these can be made through our dedicated feedback page.

vertical take-off and landing (VTOL) aircraft



  • Definition

    heavier-than-air aircraft capable of vertical take-off and vertical landing, which depends principally on more than two distributed propulsion units for lift during the take-off and landing phase of flight 

    NOTE A VTOL aircraft might be equipped with a fixed aerofoil(s) for lift during horizontal flight (i.e. it may have a multirotor or powered lift configuration)

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