Lawn mower blade design does not vary wildly. Variations are how steep the wing is on the outer back side of the blade,, whether the blade is flat from one end to the other or stepped,,, gator type mulch blades,,, Ninja type bi-plane blades and MTD even had a mulch blade for its 30" rear engine riders that had 8 or 10 blades attached to one center hub (I would love to see one in action). How about one big disc with holes or slots in it like a cheese grater blade? I'm sure it would be heavy and hard on clutches and belts. It might be a pain to sharpen, but it might cut like nothing else on earth.