Just surfin and thought I would try to help better explain y the X prop. I did see this on wings about 15 years ago, and always wanted to try it. I was tempted to try it before the last worlds after test flying the plane Jason flew but we had no time. That was a fairly small plane and while Jason flew it awesome, the big disk was definately not a plus. I only flew it one time and that was for about 4 min on the first flight. (The reason I had the honor was because, Jason being severely allergic to CA and due to all the mods we had to make to it,could of easily been blind folded by dental floss and was in no condition to do anything)

Anyway there was not the selection of props then that there is today, and the batteries were nowhere near what they are now so I am sure it would not of worked. That brings us to this year and when I teamed with Hacker and Aeromodel , I immediatly saw the potential for this to work. The way we went about it was more a common sense approach, then a scientific one. I know how props work for the most part and to me this just seemed like the way to minimize the three drawbacks IMO came with the move to electics.
1. Big disk, little plane (Bad)
2. Big disk lots of prop noise noise (Bad)
3. Downline breaking like a two stroke on a pipe. (---) <G>

Anyway the smaller disk is definately better for noise, in fact its erie at times, but that is a good thing.
It is also much better for spins and snaps making both direction an option at all times, and
Finally the down line speeds are far slower due to the extra blades.

Now for the negatives
1. Less power no doubt about it, however Its still more then enough for all wind and temp. combinationations, but you have to move the trottle stick in order to get results. I fly at full some days when the temperature here (or in Vegas) is well over 100F and we have 15-25 MPH winds. I don't care if I put 4200mah back in or 3200mah after my flight because its not costing me anymore to do so, just a little time.

Anyway, those were my objectives and it has solved them, along with its a much smoother throttle response as well as being a half ounce lighter then a two blade.

Chip

BTW I came up with the two motor counter rotating deal last year and mentioned to HL it was my goal to have it working by the worlds. Looks like the AXI boys listend. <LOL>

The funny thing is, I listened to a guy tell my dad about 20 years ago about how he figured out how to actually do this same thing with a couple of geared OS 90's for the 82(or84) TOC. He was just a little ahead of his time and couldn't get it quite get it perfected so he went back to the single big prop for the contest. I am sure he was in the Top 5 that time. Can anyone name that pilot.