Thread: New Product E-Flite Mystique 2.9m ARF
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Old Feb 13, 2013, 03:14 PM
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Quote:
Originally Posted by aeajr View Post
Since my name has been mentioned, let me help out with some terms, as I understand them because I think we have a terms issue. We are also talking about mixes and how mixes are used may vary from radio to radio.

Let me define things as I use them and the mixes I use. I have a Futaba 9C Super that has sailplane programming.

Flaperons - This is a mix in my radio that is used when the plane has no flaps so I can use ailerons as flaps based on the flapperon mix in the radio. My Easy Glider is set up this way. I would not expect this to appy on a full house sailplane since it has flaps. At least I would not use that mix in my radio on a plane like the Mystique.

Aileron to flap mixing or flaps following ailerons, is a mix when the flaps move in the same direction as the ailerons. This is done to reduce the amount we need to move the ailerons to minimize drag. One might call this flapperons but I would say it is a missuse and confusing use of the term. This requires that the flaps are each on their own channel and that your radio has a mix that will do this. I would not use the flapperon mix for this for the Mystique .

Full trailing edge camber control. This is the ability to change the trim of the full trailling edge. This can done with the flaps on a Y cable as the flaps will move together. Your radio would typically have a mix called camber or it might have a "speed/reflex" mix. You might also use crow or butterfly that allows you to change the offset of the trailing edge. Different radios have different names and different mixes.

In my radio I have a

speed/reflex mix - full trailing edge up - I have it set on a switch so it goes to the same spot every time. My reflex/speed mix also has the ability to add in elevator compensation if I wish.

Camber - Full trailing edge down a little, again with elevator comp, for thermals. I have it on a switch.

Flap to elevator - This is my preferred landing mix on most of my gliders. No aileron involvement. I have it on the left stick. It changes the glide path and lowers the stall speed. Some radios put it on a 3 way switch.

Crow/butterfly - this is a landing mix that gives me a variable mix that I have assigned to my left stick. Typically crow is set so that the ailerons go up as the flaps go down to create drag and provide a lot of breaking action. It changes the glide path. Depending on the % aileron to %flap it may or may not change the stall speed.

Using the crow/butterfly mix I could have the ailerons go down instead to create full span flaps. Again, someone might call this flapperons, but I would consider this an incorrect use of the word as Iam not using teh flapperon mix. This would lower the stall speed a lot and let me land very slowly.

So, on my full house gliders, based on my radio, I have no use for the flapperon mix. Your radio may be different.


Did that help or did I just create confusion? Different radios have different mixes and sometimes different names for those mixes. And sometimes we use mixes in unusual ways to create mixes that we don't have. So, in a DX7 you might actually use the flapperon mix to try to try to create a mix that is something like one of the mixes I use.
aeajr

I got my flaperon idea from this post (see below). This is a huge learning curve for me and I may have misunderstood. My thick skull needs to understand this. LOL.

Oct 30, 2009, 04:33 AM
Post 9
http://www.rcgroups.com/forums/showthread.php?t=1134127

Typically, during programming a flapperon function for spoilerons you will need to use negative numbers in the menu. That surprises many people.

I have many planes set up with flapperons where I can deflect up for spoilerons, or down for flapperons, according to my preference at the time. I use this on my Easy Glider, my Sky Runner and my XP-5 DL glider, just to name 3.

My experience is that flapperons, down, will slow the plane more effectively and allow you to land more slowly. Combine the downward deflection with some down elevator till the plane remains essentially level when you deploy the flapperons or it could "baloon up and stall.

Spoilerons work well when you want to get the plane down, either from height, or near the growd. Again you want to mix in some elevator to help keep the plane level when you deploy the spoilerons or it can tend to stall. On some planes that will be up elevator and some it will be down. In gusty conditions I use the spoilerons to "stick" the plane when the wind might want to lift it, just as I am landing.

Experiment with your elevator mix while you are up at least 50 feet so you can see what the plane will do while leaving yourself room to recover if it does something bad.

Flapperons increase the lift of the wing, allowing it to fly more slowly. They also increase the drag which slows the plane.

Spoilerons decrease the lift of the wing allowing it to decend more steeply without diving so you can lose height fast while maintaining a moderate air speed. A combination of spoilerons and up elevator will really slow the plane since it wants to climb but you have decreased the lift of the wing.

If you can assign the function to a slider or a dial, you may be able to have both. Or if you have them on a 3 way switch, you can deflect up or down as you see fit. Then you can see which you like better. Or you may find you like them both, but for different reasons to be used at different times.

On a hotliner you may also want use "snap flaps" in conjunction with flapperons. This would deflect both ailerons ( flapperons ) up with down elevator and down with up elevator. This allows you to make much tighter turns and loops. It can also allow you to make more square loops, or so I am told. It would be nice if this could be on a switch so you can turn the mix on and off, depending on how you want to use it.

Start with very very small deflections of the ailerons to see how it works, then build up during testing. You will probably only add a few MM or less than 1/4 inch of deflection but the effect can be dramatic at speed.

Not sure what mixes your radio has but I would expect it has these.

Flapperons can also help you fly your hotliner as a thermal glider. When in lift you can set up a "thermal" mix that drops the flapperons just a couple of MM making for a more undercambered wing, giving you more lift when in a thermal.
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