RE: Maybe if I post this I'll be shamed into finishing it..
It may well be the best prop, but I was ordering some props for my .65's and could not resist some little CF 1/2A speed props. They are pretty conventional design & look like little MA props. This thing with the engine hanging out like that may not be clean enough to use any more pitch. But it will be interesting to find out! Maybe the next generation (due to be started in 2012 or so..?) will have a cowl.
As I recall the Profi is set up for max hp at 36k. What prop it will spin there remains to be seen. I have a few of Larry Driskill's 1/2A combat props but they are all pretty low pitch for this type of application. Might be perfect for test flights to keep the speed down, the vertical should be killer at least.
I'll try to get it on the bench this week. Now where did I put my ear plugs?