Its not a two-stroke its a Wankle and yes it does make an anoying buzz.
I don't know where you have been Mostafa but its been flying out of Boscombe for a month now and so some of us are begining to mentally switch its noise off.
It must be really dangerous though, as on its first flight out of Boscombe it was sheparded by a Gazelle, now when its anywhere in the circuit everything else flying out of Boscombe either foxtrot oscars or sits on the ground until its safely out of the way.
As for the Gaza Strip my one memory of the place was the constant noise of two-strokes at altitude and still being able to hear the UAV when it was 40 miles away.