Curved drill bit?

[stateless]

I'm looking for a curved drill bit for a project. Rather than explain, here's a picture:

photo.jpg

The red is the cutting edge. It would leave a fluted bowl shape behind, like a shallow, curved speaker cone. Ideally about 80mm in diameter.

Does anyone know if such a thing exists? Or something similar?

Thanks very much.

[rod1949]

Similar shapes / cutters are avaliable in router bits

[AlexS]

The drill I've seen for drilling curved holes was like a 1" coving router cutter. Made for drilling short, curved holes for, say, threading wiring through. It was at the long-gone Academy Saws, but you may find one at Henry Bros. or other saw places.