Hey Larry;
  I have a memory of you looking for Tornado 5-3 three blade props for a 1/2A stunter. Might have been a while ago, and you had just broken your last one?? I just acquired some Master Airscrew 5X3 three blades of the latest generation and they look pretty nice!! You might want to give these a look. They are available in left and right hand rotation also. I got a few but have yet to try one, may put on on a Cox Viper     with hopped up engine to try it out. Let me know what you think.
  Type at you later,
  Dan McEntee

I would love to have a matched set of lh and rh props. The Cox ones are all different configurations. Send me a PM on how to get a set. 

   Ask and ye shall receive!    https://www.masterairscrew.com/collections/3-blade

    Your local hobby shop should be able to order. As far as matched left and right hand props. I'm working on a twin IC stunt project with counter rotating props, and the Xoar website actually has a section for matched sets of counter rotating beechwood props for IC use. getting them ain't easy and cheap but I'm working on that. They also have a left version of every prop that they make a tractor version of, but they don't have a listing for them. They just have a different designation for them. These are what I am trying to acquire for my project. I got some of the Master Airscrew units off an eBay auction, some over stock hobby place pretty cheap and just got them. At full retail they are still reasonable. They have improved their stuff quite a bit from what I have used so far on regular stunt applications, so these small 3 bladers should be promising.
   Type at you later,
    Dan McEntee

Good, news- but I always liked the way the Tornado 3 blades. Worked great on String Beginners plank kits w a Cox SuperBee.