Dowty props, at least the ones on the RR Dart, the blade angle at feather was 87 degrees a certain percentage of blade span, 75%?? The slipstream turned the prop at about 100 rpm when feathered in order to supply oil pressure to the engine bearings as well as apply a positive pressure on the air seals in the engine.
MarkerInbound you are correct. Ground fine pitch was 11 degrees. (The flight fine lock was 16 or 18 degrees depending on the installation and the cruise pitch lock was at either 30 or 32 degrees, again depending on installation. Least that's how I remember it.)
Last edited by pigboat; 29th November 2012 at 01:29.