Actually flaps can have two effects on the wing. One is to increase drag but it can also increase lift by changing the surface area of the wing which reduces the stall speed there by letting you land a airplane at a slower speed then without flaps. Most of the time (in our world) you do not need to use steeper approaches but rather reduce the throttle and let the airplane glide in. A steeper approach would increase your airspeed which you would have to bleed off some how prior to landing. The increased drag associated with flaps also increases the strain or stress on the wing and this would increase if you did a steep approach and increased your speed with the flaps down.

The surface area of the ailerons on the Dragon Ladies wing's will not be really effective as they are small and I do not believe that they will cause much drag instead they would cause a increase in lift. I had a Razzle 3D setup with flaps and that airplane shot up due to the the size of the ailerons. It had massive ailerons therefore when I selected flaps it just ballooned upwards. I turned off the flap switch and never used that function again. Never was really needed for that airplane due to the wing loading be so low. The Dragon is a very gentle flyer and is really easy to land just bring back the power and let it come right in. Yes it will float as the wing loading is pretty light but it is not a real huge floater like the 3D models out there such as the Sig Mayhem or any really low wing loaded aircraft.

Without modifying the wing to much the easiest way to introduce flaps would be to install the second servo as someone suggested into the center portion of the wing. Use a computer radio to program flaps and allow the full aileron surface be used as the flaps in lieu of modifying a portion to be flaps and a second area to be ailerons.



"Flaps are hinged surfaces on the trailing edge of the wings of a fixed-wing aircraft. As flaps are extended the stalling speed of the aircraft is reduced. Flaps are also used on the leading edge of the wings of some high-speed jet aircraft, where they may be called slats.

Flaps reduce the stalling speed by increasing the camber of the wing and thereby increasing the maximum lift coefficient. Some trailing edge flaps also increase the area of the wing and, for any given aircraft weight, this reduces the stalling speed. The Fowler flap is an example of one which increases the area of the wing.

Extending the flaps also increases the drag coefficient of the aircraft so, for any given weight and airspeed, flaps cause higher drag. Flaps increase the drag coefficient of an aircraft because of higher induced drag caused by the distorted planform of the wing with flaps extended. (Induced drag is a minimum on a wing with elliptical planform.) Some flaps increase the wetted area of the wing and, for any given speed, this also increases the parasitic drag component of total drag." Wikpedia

John