Crown without soundboards

[Delwin D Fandrich]

Ron Nossaman wrote:

> To the general populous:
>
>
> There is one thing that confuses me concerning what I've been reading and
> hearing about rib crowning. I hear more and more talk about putting the high
> point of the crown along the bridge line. If the rib is machined to a
> section of a circle, this is not possible. The high point will always be in
> the center of the rib. You can put the center of load other than on the
> center of the rib by tapering the rib, thinning the panel, or both, but the
> high point doesn't move. Are the people who talk about doing this mistaken
> in their belief that they are doing something they are, indeed, not doing?
> Another obvious possibility is that they are machining a parabolic curve
> into the tops of the ribs instead of a radius and indexing the ribs into the
> jig to get the tightest part of the curve where the bridge will fall....
>
>
>  Ron Nossaman

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Yes, there is a theoretical advantage to ribs built with a parabolic-crown.

>From a practical standpoint, however, if you could directly substitute parabolic-crown ribs for constant radius ribs, with
all other factors being kept exactly the same, it is doubtful that you, or anyone else could actually tell the difference.

Del