Can Savannah be stalled with agressive yoke pull? My friend fly ultra light Savannah, 2 seats plane,wings dont have slats ,it has vortex generators at leading edge.
He says that he cant stall plane with agressive yoke pull (I talk about speeds above stall-speed).
My question is this really true,why airflow dont separate from wing at high AoA and cause reduction in lift and sudden drop in altitude when pull yoke as fast you could?
He says plane just starts climb an that is what happend.
I have 500 hours in one, more or less... This one:

In my experience, if –with the engine at cruise, say 2/3 power– you start pulling the stick slowly, the machine does obediently pitch up, with no stall, but one has to be careful, and fast with the pedals. At the extreme, the airplane is pointing more or less to the zenith, and starts falling tail first while rolling, in reaction to the prop's torque. But it doesn't stall...
If you try the same gliding with the engine at idle, you won't be able to avoid a wing dropping down, more or less when the pitch reaches 30--40º...