Posted for "Steve Colwell" <mcmess1919@yahoo.com>:

> "Les advised checking prop orientation for parallel alignment of one of the
> blades with #6 cylinder at Top Dead Center on compression. This is best for
> smoothness."
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> To clarify this:  If one of the blades can be positioned horizontally and
> directly in front of #6 cylinder at Top Dead Center on compression, it has
> the lowest potential for vibration.  This is Hartzell's engineering opinion.
> No doubt, confirmed by testing.   Why #6 and not one of the others?  I did
> not press him because I wanted as much advice as time allowed.
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> I'll try anything that might help at this point.
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>
> Steve Colwell
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>