Dave - I am suppose to send a couple of the APC 15x4W props to Andrew for him to cut me a couple of wood versions to test on my Ecstasy with the ST90, though haven't yet because of an ice storm that we have here in Greenville, SC. Pretty nasty to say the least. I have been experimenting with a modified version of the Zinger 16x5. I cut it down to 15" and modified the tips (according to 3Dreaming's experiments) and have run that, though it runs at about 1K RPM less than the APC 15x4W. I am going to do some more carving on it to see if I can get the RPM back up because the response rate was GREAT! I will let you know how I make out.

By the way, my PBXL short kit has been a great success! I've shipped PBXLs all over so far. I am finishing building a modified version right now with conventional landing gear that I hope to finish covering this weekend and test fly next week end. I may even fabricate a set of CF LG for it to keep the weight down. this thing is a BLAST!!!
Kevin