Look in Archives
This topic has been covered quite a bit in the past. You can search for "Prop", "folding prop", "feathering prop", etc. Flex-O-Fold is one of a few brands available (also Gori comes top mind). Their website (link) has a performance comparison with other brands that should, if nothing else, sensitize you to some of the technical issues and how they might be measured. Chuck Angle in Marblehead, MA is the North America Distributor -- a very nice guy, too. BTW: The standard 2- or 3-blade prop on a C320 has a 15" diameter these days. Are you sure yours isn't undersized?
