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(Source)

The propeller on the Linke-Hofmann R.II (1919) holds the record at 6.9 m (22 ft 6 in).

What are some of the largest propellers post-WWII? Top 5 or so.

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    $\begingroup$ Proprotors on the V-22 Osprey are around 11.5 m (38 feet) $\endgroup$ Commented Jan 27, 2017 at 14:47
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    $\begingroup$ The Limke-Hofmann R.II had FOUR engines. $\endgroup$ Commented Jan 27, 2017 at 16:44
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    $\begingroup$ The largest propellers today are mounted on top of a large mast and connected to a generator. Here the record was held for many years by the Growian experimental windmill, which ran first in 1983 and had a rotor of 100m diameter. Modern offshore windfarms have now reached dimensions of up to 170m rotor diameter. $\endgroup$ Commented Jan 27, 2017 at 17:58
  • $\begingroup$ So, are we not counting propellers on helicopters? $\endgroup$ Commented Jan 27, 2017 at 22:52

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From Google, here are some of the largest post WWII propeller diameters:

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  • $\begingroup$ Depends on what measure you use. None of them ceased production before 1946. $\endgroup$
    – Aoeuid
    Commented Jan 27, 2017 at 18:17
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    $\begingroup$ It would be wonderful to see metric equivalents of these fine numbers $\endgroup$
    – Nayuki
    Commented Jan 27, 2017 at 18:28
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    $\begingroup$ @Aoeuid post-WWII means "after WWII." That is, they started production 1945 or later. $\endgroup$
    – reirab
    Commented Jan 27, 2017 at 20:00
  • $\begingroup$ Tu-95 and Tu-114 would also be in there, as they used the same engine as the AN-22. $\endgroup$
    – reirab
    Commented Jan 27, 2017 at 20:01
  • $\begingroup$ A400M blades are missing $\endgroup$ Commented Jan 28, 2017 at 22:20

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