I talked directly with Chip at the May Vegas pattern contest, though now I can't remember the prop sizes.........

Its 2 different props with a small piece of balsa (or plywood) between them and glued together. He is using the 4blade mainly to stay away from the large size of the 2 blade. He didn't put them at 90 degrees for the same reason the Helo's don't.

Here's my problem with it, you have engineers that actually put the props on the Helo's at specific angles with lots of models and testing. Chip just placed his at those angles and hoped for the best, there is no way to know if at that specific angle its performing at optimum ranges.




------------as far as performance........I saw 2 Genesis electrics fly that day. They both looked fine, no problems at all. Did chip's look better? Yes and no. He flew better but I don't think the prop had much to do with his smooth lines. Infact he had a midair and lost most of a wing, then borrowed a wing from another Genesis and finsihed his round. He flew just fine like that. He can fly......no matter what, basically.