You're running too lean . Yes..tune it on the ground.
But you have to compensate your tunning for flight. Richen it up a bit. (on the high speen needle)

that's why youre dead sticking on both engines.


If you tuned your engine from the previouse day in the afternoon when it was warmer.

Then you went out to fly the next morning persay. You'll be too lean if you don't compensate....in the morning when it's cooler
or the the air is more dense.

Also try sealing the engines backplate.
some engines are like that..that's all they need is just to be seal better.
Air being suck in through the backplate will cuase you to run lean and the engine will get hotter faster then cut out.

If both of your engines are fairly new, maybe they just need to be break in a little bit more.


prop size will also effect it..try going to a larger diameter, smaller pitch . On .46....12x4 is an odd ball size but it'll give
you torque like a 4 stroke.