Asymmetrical Tricopter thoughts

Hi all, I'm a new member of Diydrones, but I've been flying for about a year now with my hexacopter (550 clone) and I recently decided I was yearning for longer flight times. I did a bunch of research and basically my results have been

- fewer, larger rotors spinning slower (assuming same total massAUW) < which is why most full-size helis are of the single lifting rotor with tail configuration

- more cells, lower KV < I'm assuming this is because it reduces i^2 losses 

- bigger machine, larger batteries. < batteries as a larger % of the payload

so I decided I should build a quadcopter with 15"ish blades (or steal the 14" off my octo) and see how it went, but it seems that a lot of the really efficient setups are running like 18-20" blades and 100KV motors.

I decided that 4 18" blades an the appropriate motors, etc to support them is way too much money, and would produce far too large of a machine anyways, so I turned my thoughts towards tricopters.

And I decided that 3 of them was still too much, and the torque on a servo trying to rotate the plane of an 18" prop could be silly large

So here's my premise: the asymmetrical tricopter. 

The basic Idea is instead of being a Y tri with 3 Motors the same size, and three props the same size, it could be a T tri, where the tail motor is much smaller, and the center of mass lies on the axis between the two main props, then we would have a smaller, counter yaw and attitude tail prop on a long CF boom to provide leverage. 

I'm hoping this would provide me some of the efficiency of the quad with equivalent sized props, but at 55~ish% of the total AUW, and cost. 

3D rendering to come, working on it now 

Any thoughts would be most appreciated. 

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