I always assume I am the one doing something wrong before saying the airplane is not good.
So I tried the Robin DR400-100 Cadet.
It seems extremely weak as engine… I mean… seriously weak. I can’t durably climb at 500 fpm even under 4000 feet.
I attempted lean the mixture until I was loosing RPM… nothing. The engine was steadily above 2500 but it looks just super weak.
Ti climb from 5000 to 6000 feet I had to make various “jumps” literally to have the airplane to gain back speed before climbing a little more.
Possibly I did something wrong?