Re: Another flying issue
Milt,
Whether "overbuilt" or not, the triangle truss is loaded in it's weakest direction.
The load is carried well in front of the truss, putting the two forward (downstage) members in compression, while the single rear (upstage) member is in tension, each weld and pin is being pulled apart by the lever arm holding the 1000+ pounds of speakers, flying frame, top rig and motor weight.
The outrigger load point looks to be about twice the width of the truss, so well over a ton (2000 pounds) of tension is on the rear member, assuming Mark Dawson's figure of 251 pounds per speaker is correct.
A tension failure is far more likely than a compression failure in that rig, turning the truss around so two members are in tension would cut the tension load in half.
Art
