Noticed that too and the 1st 90 degrees in about 3 seconds. That is about 30 degrees per second.
Anyone knows how many degrees or seconds are needed for instantaneous turn rate calculations? Do you calculate is over 45, 30, 90 degrees, etc?
I could be wrong, but I don't think you can calculate instantaneous turn rates like that.
By its very definition, instantaneous turn rates cannot be sustained. That means as you pull hard into an instantaneous turn, you start to loose energy and airspeed faster than your engine could replace it and you start to loose airspeed and control, which in turn will adversely affect your turn rates.
The max instantaneous turn rate, as advertised in brochures, is thus a peek, unsustainable figure. In a real world situation, you would not be able to hold that for much time, and as you approach that maximum peak rate, your turn rate will start decreasing.
So just picking numbers out of the air to illustrated, in the first second of that turn, the JF17 may well achieve its maximum instantaneous turn rate of 33 d/s, but half a second after that, its turn rate will drop to 32 d/s, half a second after that 30 d/s, then 25 d/s and so on until it drops back to its sustained turn rate.
