Rebar radius bending

[YukonJack]

I will need to form horiz #4 rebar in 20ft lengths into a circular footing (53' diameter and 30 ft diameter circles). I was hoping I could do this by hand pressure (rebar on the shoulder and pressure) if the rebar has enough give. Any other tips?

[Rich]

Just use rebar chairs against the forms and tie the bar back to the formwork. Just got done doing a 32' radius, 38' radius, and a an oval in that fashion.

[YukonJack]

Sorry Rich, I'm having trouble picturing what you described. I have some rebar chairs but I don't see how what you described would bend the rebar. Iam also not using 2x forms but a fabric bag called FastFoot. One other idea was to create a jig in an arc using stakes.

[Rich]

IC.. yeah the chairs against the sides probably won't work then :)
#4 bar isn't too bad to bend.. mark out every 4' or so and put a kink in there. I've welded pipes to a piece of sheet metal and bent rebar between to pipes before.. works pretty good if you have some pipe and a welder.