in case the sand doesn't work, you could also use a spring style tubing
bender. they look like an old screendoor spring and
the copper tubing fits snugly inside the spring. these benders are in any
plumbing department. your mandrel diameter would need
to be reduced somewhat to allow for the thickness of the spring (probably
about .06").
you could quickly try out this method with a piece of scrap tubing.

bill

"Wayne Whitney" wrote in message
. ..
Hello,

Is it feasible to bend 1/2" type L soft copper pipe in a helical
pattern around a cylinder of diameter 2 1/8"? Let's leave my
motivations out it. What tools would be required to bend the soft
copper pipe?

Thanks,
Wayne