The MSC is a good prop I tried them when they first came out. Mike Clemmens makes a good product, they just didn't really suit my flying style. They have alot of bottom end bite, but as the airspeed increases I found like the Prince the bite dimminshed. As for size for a 2-blade on the 3W 100 I would start in the 27" range for diameter such as a 27x10. The thing that you have to remember about a 3W is that they are a very torquey engine you can prop them down alot more than a DA. A DA needs a bit more RPM to make the power. So don't relate performance to sound. The 3W likes the bigger props. Try a 27x10 wood first if you like it then you'll like the 3W 27x11 it is a bit more efficent so it is quieter and pulls harder.

Jeff Pfeifer