RE: Extra260 setup
For what it's worth, here is what I am using on mine:
SmartFly power expander Comp 12
SmartFly safety switch
8 x Hitec HS7955TG on flying surfaces
1 x Hitec HS7985MG on throttle
2 x 2300Mah A123 batteries
SmartFly ignition cutoff
Smartfly ignition regulator
HD Ignition switch
1 x 1100mah A123 battery
I use MTW 75 canisters on a DA-100L anda 25x12 three-bladedAir Model prop (or 26x12).
Has been working fine and the plane is very quiet. I don't use JR servos because I have had some bad experiences with reliability (use to have 40 of them).
The Hitecs are programmable (no matchboxes), can take up to 7.4V without any problem and do not develop slop over time. I use a JR9303 DSM2 for radio.
I would alsoreplace the gas tank that comes with the kit - I use the B&B Specialties 32oz. tank. If you don't see tri-stock in the motor box, apply some with epoxy.
Plane flies great - build quality is average, at best.
Hope this helps...