Quote:
Originally Posted by Hugh R
We no longer all the use of aerial boom lifts for two reasons; 1) OSHA doesn't like them because they aren't rated for lifting people and 2) we think they're underrated for this purpose. A stuntman wanted to know if I had any "math" to prove their underrated, let alone illegal. So here is what I came up with from a few websites that seem to be in agreement with each other, but intuitively I think differently, and at the end I'd like the PPOT Brain Trust to weigh in.
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As for the 467 pounds, I think it must be a derivation error coming from the fact that jyl forgot that the measurement "pounds" is a force, not a mass, so he has an extra factor of "g" floating around.
As for the original question, it's true that OSHA does not like people under booms and cranes (in fact, it's against the rules to be under a load, no matter how light the load and how big the crane). Also, the crane rated at 500 pounds static lift IS undersized for 525 pounds of humans in a dynamic lift situation. That doesn't even take into account the lateral forces on the crane (since the people are not all standing directly under the boom, there's some angle on the rope, and that creates lateral "swinging" forces on the boom which is a BIG no-no).
Now, if you had a big static platform that was engineered, you'd be fine for doing this. Problem is, big static engineered platforms are not particularly mobile, so all of your stunts would have the exact same background...