16X6 should work,I used a Zinger 16.5X5 but didnt get the performance I wanted to hover an 8.3# plane. I got some videos of the Do hovering and harriers,a friend of mine came up with a new 3-D maneuver:hover-to- landing with 33% H-9 Cap,the engine still running! I got that on vid too,just need to figure out how to get it on the computer,its a DVD Camcorder so I think its ready to go as is,no capturing software or firewire needed,will find out soon.