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Quick quention from a noise boy


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I was in a theatre recently and had to have a pair of speakers flown. From the speaker spec they were 27kg each. Allowing additional weight for flying frames and cable, I estimated a weight of 75kg as a starting point for the fly man. At the end of the gig, I enquired how much weight they had to put on as this might be useful for future times when we have to fly a pair. I was told that the bar had 170kg on and that unladen it has 15kg on. When I expressed surprise, I was told that this was a double purchase system. With some assistance from Wikipedia do I understand correctly, that this is simply double the weight do to the limited movement distance of the arbor, meaning that the actual weight was 77.5kg which if not a DP system, 75kg is a reasonable place to start?
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