ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1]   Go Down

Author Topic: Sm80F Flown thoughts?  (Read 847 times)

Douglas R. Allen

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1348
Sm80F Flown thoughts?
« on: June 30, 2021, 09:41:10 AM »

   Just a Facebook picture I came across. Sort of looks like a SM80F flown by one hook?  I'd want a little more than that. Even the Mobil stage setup looks a little weak? The Sm80F is around 215lbs. Not over the top heavy but there is a fair amount of weight up there. Or is this fine? People can easily walk under it.

Douglas R. Allen
Logged

Tim McCulloch

  • SR Forums
  • Hero Member
  • *
  • Offline Offline
  • Posts: 22198
  • Wichita, Kansas USA
Re: Sm80F Flown thoughts?
« Reply #1 on: June 30, 2021, 10:01:12 AM »

It looks like they do things the hard way (chains) and I'm not happy with the lack of stays or guys on the speakers.  There may be other issues but those grabbed my eyes right away.
Logged
"Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven's sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something."  - Kurt Vonnegut

Robert Healey

  • Sr. Member
  • ****
  • Online Online
  • Posts: 269
Re: Sm80F Flown thoughts?
« Reply #2 on: June 30, 2021, 10:56:03 AM »

   Just a Facebook picture I came across. Sort of looks like a SM80F flown by one hook?  I'd want a little more than that. Even the Mobil stage setup looks a little weak? The Sm80F is around 215lbs. Not over the top heavy but there is a fair amount of weight up there. Or is this fine? People can easily walk under it.

Douglas R. Allen

Terrifying rigging... I see open eyehooks, incorrectly oriented eyebolts, potential for huge dynamic loads from the speaker swinging around, and I would hazard to guess that the truss and the frame isn't rated for the moment (twisting) from having the support point off axis from the load.
Logged

Bob Faulkner

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1156
  • Raleigh, NC
Re: Sm80F Flown thoughts?
« Reply #3 on: June 30, 2021, 04:58:08 PM »

The truss where the speakers are hanging from does not look like it's made to support a hanging load.  The "X" (where the speakers are hanging from), looks like it's used to tie truss sections together.
Logged

Steve-White

  • Hero Member
  • *****
  • Online Online
  • Posts: 704
  • Fort Worth
Re: Sm80F Flown thoughts?
« Reply #4 on: June 30, 2021, 05:13:11 PM »

No guys on the stage either, in a wind gust that thing would twist and easily collapse.
Logged

David Sturzenbecher

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1817
  • So. Dak.
    • Sturz Audio
Re: Sm80F Flown thoughts?
« Reply #5 on: June 30, 2021, 05:23:57 PM »

No guys on the stage either, in a wind gust that thing would twist and easily collapse.

Hydraulic mobile stages like this don't need guylines.

In general they have a far higher wind rating then aluminum truss roofs with guylines.

That said, I am not speaking for this roof in particular.
Logged
Audio Systems Design Engineer
Daktronics, Inc.
CTS-D, CTS-I
AES Full Member

Doug Fowler

  • Member since May 1995, 2nd poster on original LAB, moderator on and off since 1997, now running TurboMOD v1.826
  • Administrator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1982
  • Saint Louis, MO USA
Re: Sm80F Flown thoughts?
« Reply #6 on: June 30, 2021, 05:45:59 PM »

The truss where the speakers are hanging from does not look like it's made to support a hanging load.  The "X" (where the speakers are hanging from), looks like it's used to tie truss sections together.

My guess is the X accommodates up/down points for a line array.  Or not.

In any case I would get a fly bar welded for that loudspeaker. We just covered that in another thread.
Logged
"It's got electrolytes.  It's got what plants crave."

John Schalk

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 292
Re: Sm80F Flown thoughts?
« Reply #7 on: July 03, 2021, 10:32:42 AM »

It could be a coincidence, but that exact system is for sale right now on FB in the Everything USED Stage, Sound, Lighting & Video for Sale or Swap group.  The seller's location is Melbourne, FL.

I like the idea of the SM80F, but my back hurts just thinking about moving a 200lb speaker around these days!
Logged

Riley Casey

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1690
Re: Sm80F Flown thoughts?
« Reply #8 on: July 03, 2021, 01:54:34 PM »

I see what appears to be a single guy wire from the back center of each box to an off stage ground point. That and the swagged chains appear to be the only things countering any twist. This kind of “rigging” makes everyone’s insurance more expensive.


It looks like they do things the hard way (chains) and I'm not happy with the lack of stays or guys on the speakers.  There may be other issues but those grabbed my eyes right away.

ProSoundWeb Community

Re: Sm80F Flown thoughts?
« Reply #8 on: July 03, 2021, 01:54:34 PM »


Pages: [1]   Go Up
 



Site Hosted By Ashdown Technologies, Inc.

Page created in 0.064 seconds with 22 queries.