Based on a few month's digging, I think there's a whole lot of us that would like more scale multi-blade props, but apparently the multi-blade naysayers have convinced all the manufacturers that it's a bad idea, because there just aren't any. Besides Iron Bay, there are several European manufacturers that make pattern-style high efficiency three-blades (mostly *very* expensive), Zinger who makes a line of three and four bladed wood props with metal hubs, and Master Airscrew who make three-blades up to 16". That's it.