I'm trying to get as much endurance out of my Y6 as possible. I was impressed by the Tiger Motor MN3506-16 motors mentioned on Forrest Franz's post here, so I shelled out for them. I'm using a 3c battery with the recommended APC 12x3.8 props which, according to the manufacturer should produce 470g thrust drawing 2.8A. 

Here's my problem. With the Y6 co-axial setup I'm drawing closer to 4.6A per motor at hover, which works out to a load of 390g per motor. My guess is that I'm loosing all this efficiency because of my propeller choice. 

What propellers do you use on your Y6? What kind of current draw are you getting? Anyone else using the Tiger Motors for the coax setup?