Making hatch ribs

Hello. I'm ready to make the hatch. I've read various threads about the rear hatch using the search function.
But my question is , how many ribs am I able to get from a 4 x 8 sheet of plywood? I'll use 3/4 thickness. They will be 5' 6" long and have the curve that's pretty typical of a teardrop. Seems like a simple question but I'm having trouble with a visual.
They'd be about 2" wide at the top and the bottom.
Thanks,
But my question is , how many ribs am I able to get from a 4 x 8 sheet of plywood? I'll use 3/4 thickness. They will be 5' 6" long and have the curve that's pretty typical of a teardrop. Seems like a simple question but I'm having trouble with a visual.
They'd be about 2" wide at the top and the bottom.
Thanks,