I have a couple of those orange props. I was using them for a direct drive tail system on one of my helis.

I've got a couple videos that I'll be posting. One is done. It's a short one with one of my Bipes taking off in the driveway. It may take a few minutes to show up.
[link=http://www.youtube.com/watch?v=8jGwobpjy94]http://www.youtube.com/watch?v=8jGwobpjy94[/link]