You are flying your 4 channel glo or electric plane. You use R/E/T/A - rudder,
elevator, throttle and ailerons.

Standard 4 channel flies that fine. No issues at all.

Flapperons -

Put in two servos for the ailerons and assign them to different channels.

Under normal flight conditions the ailerons work exactly as before, but using
two servos; No difference.

You are coming in for a landing. You turn on final approach to the runway and
line up for the center line. If you had flaps, here is where you would use
them, but your plane does not have flaps.

You level up the wings. At this point, you flip a switch and
your ailerons just became flaps. You can still use the same stick and you can
still use the ailerons to bank/steer the plane, but they are both turned down
now so you will get a different aileron response than normal.

This is the flapperon mix. You now have the ability to come in much slower
which gives you a much softer more controlled landing. Flaps lower the stall
speed so you can fly at much slower speeds without stalling. Very useful!

That is surface mixing and that is what a computer radio can do for you.

A popular way to do this on gliders is to set up spoilerons. Spoilers spoil the lift of the wing and help you bring the plane down in a
level flight path for a slide in on the belly landing. Without spoilers, if your glider has too much energy and you are committed to landing, you have to put the nose down which can result in a hard landing, or "glide it out", if you have the room, until it comes to a rest and then take the long walk. You can't hit the gas and go around again, you have to come down somewhere. Spoilers make it easier to control where.

Gliders have such efficient high lift wings and such light wing loading it can be hard to get them down, especially in gusty conditions. Really! You have to see it and feel it to understand. It is amazing!

I have one glider that has ailerons but no flaps or spoilers. It goes in the air this weekend. I will be setting up flapperons AND spoilerons on that plane, for landing situations. Then I will see which I like better on this particluar plane, or I will leave both acive. It is just a question of whether you flip the ailerons up or down.

If you want to see what flap/aileron mixing looks like in motion, visit this link. There are videos posted near the bottom of the page and you can watch the surfaces move.
http://airfieldmodels.com/informatio...l_aircraft.htm