[SML] FOH hang and focus safety improvement needed

[Bill Conner]

Chain driven? I assumed manual.  I know too little about the room to
understand why not on ceiling, but I'm sure there are reasons.  And a 30'
span is easy, and only slightly beefier than an 18' span with 6'
cantilevers.  The tracks could also be hung from overhead adjacent to
walls, and not bear on walls.

On Nov 28, 2017 1:06 AM, "Bill Nelson via Stagecraft" <
stagecraft at theatrical.net> wrote:

> > Why the need for beams spaced out from the walls?
> >
> > Bill
> >
> >
> >
> > Old fashioned simple  beam design. IIRC a cantilever of 1/3 the span is
> > best use of material. So 1/3 cantilever either end theoretically - by
> > simple structure design - require least depth truss.  If supported at
> ends,
> > it would have higher bending moments.
>
> That would require putting the tracks over the audience seating. That is
> not
> going to happen. If we go the chain driven catwalk route, the catwalk will
> have to be supported only at the ends.
>
> Bill
>
>
>
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