Keeping the kit as close to its originial condition, copying the kit is what I had in mind. It can almost be done by using a copy of the drawing for tracings, but difficult. There would have to be a few areas drawn out by the builder.

The Veron kit that you built sounds interesting, as I was unaware that Veron made more than just impellers (say, ahh...still have the plans? ) I never heard of the company until the search for a modern blade for the build made one turn up. The two that I was able to purchase (out of buisness I believe) are going to be tested in the plane.

They are both a Type "C" (.061, but this was before TD's I'm pretty sure) and 3.625" in diameter - same as original but has more blades and pitch.

If I can't get the revs out of a stock one, I might try narrowing the blade width, and saving the other one to try out on a Norvel .061, but that would take some re-engineering for the tractor set-up so I'm saving it. Currently manufactured impellers for this size engine and duct are hard to find. I'm wondering if I am looking past them, like in a dustbuster unit or something like it that I could take apart or order a replacement part and adapt it.