On the 9c For extreme 3d throw can I use the ailerons to act like spoilerons when I pull the elevator stick past a certain point? i.e. elevator channel as the master, and the flap as the slave (you're already using flapperon mix for the two aileron servos). Set a curve so the ailerons don't move until the elevator stick is about 75% toward the stop in each direction. How would I do this

You need to use either mix 6 or 7 which are 5 point mixes. Keep the middle 3 points set to zero but make points 1 and 5 the percentage of spoilers you want. This is called snap spoilerons as they only come on after 75% of stick travel on the elevator. Hope this helps.

Tom

Will this help with some 3d manuevers like the parachute and others? Thanks for the help too

Yeah its in Pmix 6, you set

Step 1: -75
Step 2: 0
Step 3: 0
Step 4: 0
Step 5: 75

Depending on your aileron servos, you may have to reverse the -75 and 75

Usually spoilers help with harriers and parachutes and waterfalls etc. Helps with the wing rocking making the plane a little more stable.