Aerowerx Well-Known Member Joined Dec 1, 2011 Messages 5,463 Location Marion, Ohio Jul 12, 2019 #1 Note the control surfaces at about 5:00 in. I counted 3 on each side. Outer ones are most likely elevons. The two inner ones are deflected opposite of each other for use as drag flaps. This would slow it down without causing any pitching moment.