Small flying with differential thrust, do I need to add dihedral

[Barrett]

Hey guys, I just met a guy that is trying to get started in RC flight. He recently purchased one of those stealth bomber planes from Wal-mart. It uses differential thrust from two independent motors for control. However, he couldnt get it to fly well before it was so beat up that it is now unrepairable. He brought it over and I took a look at it. I noticed that it was about the same size as the SKINNI MINI which is a small foamie flying wing that I make and sell as a kit. I told him that I could look into putting the gear and motors into a Skinni Mini. He let me keep the plane and I pulled all of the gear out of it.

So my question is do I need to add a little dihedral into the wing in order for the differential thrust to work well? Any other thoughts you guys might have about this type of project?

Span is 24"
I think I can keep the AUW to around 4 or less oz.
Battery is a small 4x300 2/3AAA pack.
RX and ESC are combined into one small unit,
Two small "slot car" type motors.
the props look about like 3x2

Should be a fun experiment even if it doesnt fly.
Thanks for any help!
Barrett Moffett
barrettsrcplanes@yahoo.com

[Ollie]

The swept back flying wing has yaw to roll coupling because the wing that leads produces more lift than the wing that lags. The resultant bank is basically what produces the turn by tilting the lift vector toward the center of the circle. This is somewhat like the action of dihedral which is another way to produce yaw to roll coupling. If the turn response is weak, the plane needs more differential of the thrust for more yaw or stronger yaw to roll coupling.

[Barrett]

Thanks Ollie.