RE: programming flaps on futaba
Flaps (CH6) should be assigned to SW C Disabling the rotary knob, and will provide 3 positions. Up, Down stage 1 and Down Stage 2. By playing with the ATV for CH6 you can achieve the movement you desire. For example I have 34% for stage 1 and 100% for stage 2.
To add the second flap servo - say CH8 - open an unused P-Mix make CH6 the master and CH8 (in this example the slave). You may need to reverse the slave servo if the linkage is on the oposite side to CH6.
Dennis