the.com/monoplane

One wing to rule them all, after decades of pilots insisting two were safer.

means An aircraft with a single set of wings, as opposed to the stacked double wings of a biplane.

from A 19th-century scientific compound: Greek 'monos,' alone or single, bolted onto 'plane,' from Latin 'planum,' a flat surface — the same 'plane' that names a wing's lifting surface. So literally 'one flat surface,' coined alongside its sibling 'biplane' as aviators sorted out how many wings the air actually demanded.

early skeptics
Militaries banned them as too dangerous around 1912
the holdout
Biplanes dominated until structural advances won out in 1930s
wing count
The default modern airliner has exactly one
the trick
Internal metal bracing replaced external struts and wires
for instance

cessna 172 — most produced aircraft in history with over 44,000 built since 1955

supermarine spitfire — iconic british fighter used in wwii, first flew 1936

de havilland beaver — canadian utility aircraft with 1,657 built, widely used in remote regions

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