korrents

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Bjorn’s Corner: Sustainable Air Transport. Part 27. Multicopters.

Bjorn Fehrm · 8 Jul 2022 · leehamnews.com ↗

2 korrents from this piece

Bjorn Fehrm did not write this page.

Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.

  1. Our reading

    Every aircraft propulsion system is an air pump, and accelerating a large mass of air a little is always more efficient than accelerating a little air a lot.

    Their wordsAll propulsion systems are air pumps, and they work more efficiently if they accelerate a large mass of air to a small overspeed than vice versa.
    Interesting

  2. Our reading

    The multicopter air taxi is energy-intensive by construction, which holds its range to about twenty miles however good the batteries get.

    Their wordsThe drone-like architecture of the multicopters is simple, but as the rotors are responsible for keeping the unit at a constant altitude with hover power, they represent an energy-intensive version of VTOLs. Their range is, therefore, short, typically less than 20 miles.
    Interesting