..Simple and rigid aileron structure..
.Sheet surfaces and ribs make the aileron/flap light and rigid. Ailerons typically run 7 rib bays, flaps 4 bays.
.Each flap is moved by a single servo and bellcranks/pushrods. 45 degrees down is more than enough travel.
..Flaps on a Seniorita and a Senior..
.Construction and layout sketch.