Thanks MJCD.
I am building one just like yours for a rocking chair based on Hall Taylor plan. That chair is still its infancy. It will probably stay there for a while.
The table leg I need the arch for is 3×3 cross section and 26" in radius. I would have to stack a lot of 2×4 to get the form for that kind of radius.
If I go 4×6 I will need about 9 pieces of 35"-40" long to make the form. I was hopping to minimize $$ and wood waste.
Abbas, Castro Valley, CA