This is the Dubro mechanical mixer and is commonly avaliable at Tower (around 12 Bucks):

http://shop.dubro.com/products/productdetail/V-Tail+Mixer+(QTY/PKG%3A+1+)/part_number=215/101.0.1.1.5161.5191.0.0.0?pp=12&

They work OK and I have used them a number of times with various Scimitar flying wings. Of course now I would simply use Radio mixing.

They are listed as a V-tail mixer but can also be used as a elevon mixer makes no differance in the way it works.

Jhsmith

Two concerns, if you try to use a surface radio for your homebrew airplane is if it is a pistol grip that is not going to be practical and you will almost certainly not be able to control the airplane because of poor ergonomics.

The other concern is If: your surface transmitter is on the 75 Mhz band then it is illegal to use for an airplane. If it is 2.4 then that is shared and OK. If it is on the 27Mhz band then that also is a shared band and can be used for an airplane or surface.

John