Roger Halstead wrote:


Then we also have to deal with certification issues. The manufacturer has only
certified my aircraft for one prop. I suppose that STCs would be developed pretty
rapidly if 3-blade props were mandated, of course.

And if they were mandated they'd probably run between $1,000 and
$2,000 each plus the cost of the prop and labor.

Usually it's the prop manufactoter who lets his props be certified for a
type of plane, because it's him who wants to sell the prop. So you can
buy a fully certified prop. That's how it works in Europe, and how it
would in the US, too, I suppose.

Stefan