Thanks for the intro Scott but can't help Gary with the 74. My RM 1000 (1000 sq. in. area) uses it's big brother, the 78 and is yet to have enough time on it to evaluate. The 78 comes in at 19 ozs. and is a power house and a half.  so far the only info I can give yiou is that it is more than adaquate for my purposes. Plenty of power to go over the top and it has a somewhat 4-2-4 break. All this still needs to be worked out, different props etc. I run 15% nitro 22% castor. The prop I am using now is a 14-5. As far as fuel consumption try 8.5 ozs/7 min flight. That is all I can tell you right now.

  "Billy G"   

Gary;

  Here is what we did on the bench. Run the motor in a fast 4 cycle. Run it for a few minutes then pinch the fuel line, it should go to a 2 cycle. Let the line go and see how long it takes to go back to a 4 cycle. This will give you an indication of what will happen in the corners. It was instantanious for us. All is well in "G-Man" land.

  That Sweeper is a handful according to Bob Zambelli. Should be fun though. Good luck it is a bib undertaking.

  "Billy G"

 EDIT --- If you do not have one the venturi and NVA are available from Fox, it is the same one we use on the 78. Just unbolt the carb and replace it with the venturi.