Pegasus, great project!
The "co-pilot" is made by FMA
https://www.fmadirect.com/site/fma.h...roducts&cat=29
Another choice could be the futaba PA-2
http://www.futaba-rc.com/radioaccys/futm0999.html
I have the old version of the FMA co-pilot on a heli. It works very well.
/Doug