Anyone remember that convection fan thing from the 80's?

Hi. You put it in your home oven to make it work like a convection oven.

It was about the size of a large dinner plate

shaped like a 2 pie tins (like a flying saucer)

made out of metal and had a fan blade that sat on the bottom tin and rotated to circulate air in the oven.

I cannot remember if you had to wind it or if it just turned from natural convection

If you remember this thing please let me know what the name was.

Thank you