Decathlon, 150 hp, fixed pitch or 2 blade aluminum constant speed prop
Super Decathlon, 180 hp, 2 blade aluminum or 2 or 3 blade composite constant speed prop
Extreme Decathlon, 210 hp, 2 or 3 blade composite constant speed prop
As far as I know. Every time I think I've got a handle on all of these Aeronca/Champion/Bellanca/ACA variants I find out I'm wrong.