Unusual rib structure?

[Ron Nossaman]

>I noticed, the other day, on a Hamburg Steinway C, that the cutoff bar was
>notched to allow for the feathered part of the rib to extend beyond it to
>the rim.  Is this counterproductive?  Generally, with cutoff bars do the
>ribs terminate at the cutoff bar?
>
>David Love

A big area of panel unsupported by ribs outside the cutoff will buckle with 
humidity swings. It's not acoustic, just administrative.

Ron N