Koppers Aeromatic F200 propeller

[Tom Laird-McConnell]

I was looking through the type certificate (since at this time of year it rains in the Pacific NW I don't have anything better to do!) and I happened to notice that under approved propellers there were 2 adjustable pitch propellers approved for the Ercoupe.   One is called a Koppers Aeromatic F200 hub.  What little I have been able to research is that it was an adjustable pitch propeller with wooden blades that had no control...aka, it would automatically adjust the propeller pitch based on load.   The other is a controllable Beech R002 or R003 which has a propeller control, although aparently is not constant speed. (?)   Does anyone know anything about these?  Are they still available, if not, why not?  Sounds like a great idea!   -Tom