Never used one by my guess is that much depends upon the capacity of the storage tank taking the compressor output then sending it downstream to the...
Neil Gaiman's The Ocean at the End of the Road, John Higgs' William Blake vs. the World, Michael Connelly's Desert Star, and a bit of Reuel Parker's...
My experience would lead me to think copper's gonna be too soft for this purpose. One good, hard blow may very well fold your canopy's frame in half...