The propeller of a anti-submarine warfare airplane the EP-3E Orion↗. Note the blade's attack angles are variable, and in this case turned flat.
above: The propellers of a cargo aircraft Hercules↗. full size 1800x1322 Note the blade's attack angle are variable, and in this case turned very sharp.
A contra-rotating propellers of a modified P-51 Mustang fitted with a Rolls-Royce Griffon. Photo by Eric Gideon. source↗
For encyclopedic info on propellers, see: Propeller↗
See also: