Originally Posted by
NutLoose
I do believe there is a Seafire floating around with the facility, but that is because they fitted an ex Shackleton engine, so as it had the facility they added it.
Seafire FR.47 VP441 has that option. As you stated it uses an ex-Shackleton engine and the feathering option was also retained because it can cut down on the drag. Some of the contra-prop Reno racers found out the hard way that six blades in full-fine produce a lot of drag (perhaps it was just Red Baron, I can't remember the details right now).
PS890 also flew with a contra-prop for a while, I don't know if it had a feathering option at the time. It has since been restored to a standard five-bladed prop.