a true 3 blade set has completely different span and chord CG requirements to perform properly. they are much lighter too. simply matching up blades that were designed as 2 blade sets wont perform. they will fly, but they wont perform. I have been testing 3 blade setups on the E7SE for several months. now that helix blades are gone, there are no good blades left (I haven't tried aligns 3 blade set yet). I actually just disassembled the 3 blade setup and sold it yesterday. it is fun, feels great, flys differently (in a good way), but the lack of decent blades has made me back off of the project.