News

Coming to Terms: Research is Not Development (But Development is Sometimes Research)

• 02 May 2023 10:05 AM
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This series addresses terminology that is misleading or erroneous, and proffers definitions to be used as canonical.

A Taxonomy of VTOL Aircraft Configuration Types — Part 3: Reinventing the Wheel

• 24 Feb 2023 09:57 PM
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This series addresses terminology that is misleading or erroneous, and proffers definitions to be used as canonical.

Coming to Terms: Taxonomy of VTOL Aircraft Configuration Types — Part 2

• 11 Jan 2023 09:06 AM
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This series addresses terminology that are misleading or erroneous, and proffers definitions to be used as canonical. Here the basic terms of propulsion architectures are discussed.

Coming to Terms: Taxonomy of VTOL Aircraft Configuration Types — Part 1

• 13 Nov 2022 09:33 AM
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This series addresses the uses of terminology that are misleading or erroneous, and proffers definitions to be used as canonical.

Coming to Terms: Rotor Redux

• 04 Jan 2022 11:57 AM
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This series addresses the uses of terminology that drift toward becoming routine expressions or idioms — or already are — but are misleading or erroneous. Last issue’s “Coming to Terms” column on the definition of the word “rotor” generated a significant amount of discussion. The article was featured on the VFS eVTOL.news website and e-newsletter, with several thoughtful comments posted the first day, followed by emails to the author and Vertiflite.

Coming to Terms: Rotor

• 27 Oct 2021 11:49 AM
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This series addresses the uses of terminology that drift toward becoming routine expressions or idioms — or already are — but are misleading or erroneous. This installment proposes a more rigorous approach to the terms for rotary-wing propulsors on vertical lift aircraft.

Coming to Terms: Model Based

• 02 Sep 2021 11:22 AM
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This series addresses the uses of terminology that threaten to become routine expressions or idioms — or already are — but are misleading or erroneous. This installment clarifies what is a model-based method, and identifies distinctions between and complexities of various approaches.

Coming to Terms: The Design

• 29 Jun 2021 08:05 PM
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When someone talks about “The Design,” keep in mind that it’s a reference point… but it’s only the plan. 

Coming to Terms: Aircraft Survivability is Revered — But What About Availability?

• 01 Mar 2021 04:01 PM
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Most consider aircraft survivability only about reduction of aircraft radar signature, or radar cross section (RCS), through shaping and materials. Lowered RCS reduces the range at which a threat radar can detect, locate and identify a target, ideally reduced to a range so small that one can act with impunity — a significant military advantage.

Coming to Terms: “Levels of Autonomy” is Unsound

• 21 Dec 2020 09:26 AM
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Autonomy, among the hottest topics in aviation today, lacks a clear and agreed-upon definition, though a consensus is emerging.

Multiple aviation “level of autonomy” scales have been put forward, such as Autonomy Levels for Unmanned Systems (ALFUS) by US government’s National Institute of Standards and Technology (NIST). But the adjective “autonomous” is binary: either an actor (person or system) performs a task autonomously or it has supervision.