new multirotor(hex) engine configuration? XY6

helo,

I wanted to disign and make a 3in hexacopter for competetaive racing. It had to fit a tramp HV , runcam micro swift V2, graupner GR-18 and 3in props. after lots and lots of prototyping in inventor I ended up with a Y6.

After building and flying it i noticed that the yaw was very unstable at 80+% throttle(to an uncontrollable amount). This was probably caused because the rear bottom motor created less thrust and torque because of the top motor blowing into it. The front motors were no issue since they would cancel themselves out. To solve this issue i decided to place the rear motors next to each other. This however could induce some unwanted roll/yaw mixing since i am using a Y6 configuration on the FC. 

After building and flying it i think it flies waaay better than the Y6 setup. Now i wonder has anyone build or see such a configuration or is this a completely new way of mounting the motors.

!!!!the rear motors are not redundant!!!!

used componets:

-6 X EMAX 1306 4000 kv motors

-6 X oversky MR-20 pro f396

-Graupner GR-18 FC/receiver combo

-Immersion RC tramp HV 

-runcam micro swift 2

-some wires

-XT60

-a max 15 mm wide velcro strap

-9 X 22mm m3 bolt and nut

stl files:

https://www.thingiverse.com/thing:2753555

notes:

i will make a version that fits a 20 X 20 mm FC but the usb port will not be accessible so BF osd is recommended for changing pid values

any micro cam will fit

it is specifically designed for the tramp

the motor mounts have to be printed in a semi flex material. if not the motor screws will not be mountable.