Sorry, we're not set up for PayPal. A check works fine. I test fly them all to be sure they land without bouncing.

Again, the reason for the 4 stokes is noise. One site we fly at is along the Clinch River in Knoxville, TN. A developer has bought the river front property and is in the process of building 250-500k homes. We wouldn't last long flying Rossis and Hannos turning 15k in a 130mph rocket.

I have a Curare with an OS91 in the nose. I'm still making friends with it, but it does just fine with the thrust of a bigger prop generated at lower rpm. There does seem to be a lower limit to how slow it wants to fly, but I'm not sure of that yet. I also flew an Atlas several years ago with a Saito 91. That was a very nice combination with almost unlimited vertical. It is common practice to use a taildragger configuration to help offset the weight of the 4c. This is allowable within the rules.

We've got a couple guys who experimented with YS61s. They were REALLY FAST, but wouldn't idle without the pipe. A dynathrust muffler helped some, but reliability was a problem.