All, I am going to install a counter-weighted c/s prop on my IO-360 powered (with inverted oil) RV-7 as I intend to do enough vertical and inverted aerobatics that it is the thing to do. Looks like my choices are the Hartzell metal or the MTV-15B-C/C 183-50. The WW 200C would be a choice, but it is 77" whereas most RV props are 72" or 74". I have experience with the Hartzell on a different airframe and like it, but it is heavy and not so smooth with some rpm restrictions. The MT is lighter, smoother and has no rpm restrictions. I would like to install the MT, but it seems like most MT props are the slowest of the bunch cruise-wise. There is some guidance in the archives regarding 3 bladed MT's but none that I can find on the 2 bladed version. I am building the RV-7 for a dual role, and I would like the cruise speed to be fast. Anybody out there with some experience that can help me with this decision? Thanks for your input.