Hi Ed
Thanks for the comments, the big one is 3feet dia, 4 feet height. I would not build any bigger than this one. I hate to say this but have another one on the board just a size up from the little green one. The big one is has alot of torque and have some big long rods pounded down at each leg, I thought is still might take off but still holding my breath. The larger one on camper is on its way to top of 3 leg 40 foot tower, I hope soon, just have the last 20 feet to bolt up, its scary up there! Once the bearings break in this one spins very nice. I don't know if you remember my little 6" one, well this one spun its bearings to death, another repair one day.
Wayne