I fixed the problem - my spline was out-of-whack, which is why it wasn't lining
up with the sphere sweep, and producing all sorts of weird results.

I thought that using triangles would be faster than cylinders - but it's slower?

The other thing that I noticed is that using triangles with a small loop step
made the SKY render slower.  I'm not sure why that would be.

Anyway, after much plotting and puzzling, and backtracing, I fixed it up and I
think it looks pretty good.

Shown with the propeller are the coordinates of the spline and the scaled trig
functions I use to curve around the hub.

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