Hi Cris,
Well, I use to have a 2mtrs Piper.. But with a .60 . More than enough.
You can use your 26cc on the Piper, but in my opinion, that will be a bit too big for the structure.
But you can still do it, but you will need to have a proper look first if the plane can take this amount of power.
You can always reinforce the structure a bit, and most important the firewall, as, I guess this is RTF plane, they are generally not generous in glue on these places :wink:
I will stick to a .60 or .70 myself as the plane might be too light for the 26cc.
After that, well, the throttle is a proportional channel !