you really don't need flaps to fly it as it lands super slow without them but if you do use them you do need to mix down elevator as the nose pitches up when you lower the flaps. And then you need to fly it and adjust the down elevator mix percentage as needed. I have a O.S. 91 four stroke in mine and it lands very slow.This is not true generally with this type of plane but it is extremely light which makes slow landings possible. Tim