[SML] Rigging calculation question...

[Steve Payne]

I agree. But personally I would get an engineer to do it for liability
reasons. Maybe be the engineer would show you how it's done.

On Wednesday, October 5, 2016, Bill Sapsis via Stagecraft <
stagecraft at theatrical.net> wrote:

> Asking is how you get qualified to do things….
>
> Bill  S
>
> bill at sapsis-rigging.com
> <javascript:_e(%7B%7D,'cvml','bill at sapsis-rigging.com');>
> http://www.sapsis-rigging.com
> +1.267.278.4561   mobile
> +1.215.228.0888   x206
>
>
> On Oct 5, 2016, at 8:57 PM, JIM VOGEL via Stagecraft <
> stagecraft at theatrical.net
> <javascript:_e(%7B%7D,'cvml','stagecraft at theatrical.net');>> wrote:
>
> As a person who asks questions, I disagree.
> If you don't know enough to ask, your probably not qualified to do it.
> If your knowledgeable enough to ask intelligent questions, you may very
> well be qualified to do it.
> And a licensed structural engineer is very often a good idea, even when
> you think you don't need to ask.
>
> Sent from my iPhone
>
> On Oct 5, 2016, at 17:34, Bill Conner via Stagecraft <
> stagecraft at theatrical.net
> <javascript:_e(%7B%7D,'cvml','stagecraft at theatrical.net');>> wrote:
>
> Well, not trying to be mean but if you have to ask, you're not qualified
> to do it.  If the screen is wider than the middle 4 points, then the center
> two are carrying a majority and the next one each side less, and the long
> and short nearly nothing. That all assumes the controls are perfect.
>
> A licensed structural engineer would be a good idea.
>
> On Oct 5, 2016 3:05 PM, "Jason C via Stagecraft" <
> stagecraft at theatrical.net
> <javascript:_e(%7B%7D,'cvml','stagecraft at theatrical.net');>> wrote:
>
> So how do you all calculate loads for large items that have several
> connection points to the truss they are hung from?
>
> Example, 70' Truss flown off 6 motors to steel beams.  Hanging an LED wall
> off the truss.  Wall is 44' long, centered on the truss.  Total weight of
> wall and hanging hardware is roughly 4600lbs.  the wall/hardware will
> connect to the truss at approximately 20 points along the length of the
> wall.
>
> To get a rough estimate, I was encouraged to just do an evenly distributed
> calc across the 6 motors, but I know this is not accurate as the wall only
> extends a few feet past the inside 4 motors.  Almost all the weight is
> contained to the inside 4 motors if I understand it correctly.
>
> Any thoughts as to how should I be calculating this load so I can get an
> acceptably accurate idea of load per motor point?
>
> Thanks!
>
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