Great Planes Stuka, 9 pounds. I have never flown it with a two blade as I wanted the thrust and braking effect that you mentioned, it has an effect on speed when I put it into a dive and flies slowly and scale. The big blades on the graupner 3 blade are different to a MA 2 blade which I fly a lot of my other smaller planes on, mostlt in the above mentioned areas.
Good Luck
Paul