Well, after flying my Kadet yesterday for the first time in hot humid weather, I can definitely say the temp and humidity play a big role. The plane was just not the same. It lost altitude quickly, the motor wasn't producing as much power, I normally fly at half throttle, but I was almost at full to get at near same performance.  My last flight I was doing some T&G and after the last touch, I went to go, and the motor just didnt want to spool up fast enough. By the time it produced enough power the plane was brushing the tops of the corn and took out 1 plant to the root. There were 2" pieces of corn plant scattered around the plane. Thankfully nothing got damaged.

Live and learn.

I had tuned my DLE20 yesterday too. It seems to run ok, but after taxiing about at small throttle inputs, when I went to throttle up it died, twice, in the same spot.  Just wondering if the humidity and heat played a art in that.