Crown, was RE:Curve on Bridge Bottom

[Richard Brekne]

Thanks kindly...

So, just chewing on this one  a bit.... take your rib # 5 at 9.4 mm crown...
that gives a rib length of 1163.291262 mm for an 18 meter radius. With a
segment angle of 3.7 degrees that gives an arc length of 1163.49380 mm yeilding
a difference of 0.2025412 mm or roughly 0.008 inches.... no ??


Ron Nossaman wrote:

> >Not quite sure I understand these figures below... you say crown heights.
> >Are you
> >refering to crown as measured when taking a straight edge along the bottom
> >of the
> >soundboard and measuring the gap in the middle ?
>
> Yes.
>
> Ron

>
> Hi Dale,
> Look at unloaded crown heights for "standard" 18M (60') radius ribs in a
> generic board.
> Rib #1, 2.6mm
> #3, 7.2
> #5, 9.4
> #7, 6.3
> #9, 1.8
> #11, 0.5
>



--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html