Just to add another, larger diameter turbo-prop to the mix.
The Lockheed P3 Orion, and therefore the Electra props are constant speed (in flight) at 1,021 rpm, with an 11 foot diameter prop if I recall!
Though the Electra had square-tipped and the Orion round-tipped prop blades.
Last edited by EW73; 3rd November 2012 at 23:53.