Power stall
Thanks for you clear answer FlyingStone.
I wanted to see the natural reaction of the airplane while stalling with engine so I climbed 4500 feet AGL, I started the manoeuver and I did nothing to recuperate the stall until the very last moment (when the nose was down and the aircraft entering into a left turn). I then tried to follow the aircraft tendency, pushing the stick forward and the yoke to the left. I lost 500 feet of altitude before it stabilized again in straight and level flight.
It worked quite well without any problems but I'll have anyway a look at the link you just gave me to see what they say.
The thing is that the C152 seems to me an extremely stable aircraft and sometimes it gives me the impression that I could do almost anything with him (always with sufficient height above terrain of course) and it would not betray me by entering into a spin or a spiral. Am I wrong ? (I did many stalls before with instructors).
Have a good day,
Emmanuel.