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-   -   Dynam Waco Aileron/Rudder Mixing (https://www.wattflyer.com/forums/showthread.php?t=73936)

garyp1029 06-21-2014 02:50 AM

Dynam Waco Aileron/Rudder Mixing
I have never tried mixing on any plane and wonder if the Waco would benefit from aileron/rudder mixing. If so, what would be your suggestion as to the proper degree/amount of the mix? How about switching from a non-mix on takeoff to a mix during flight? Thanks. Gary

fhhuber 06-21-2014 12:00 PM

Aileron-rudder mix is typically used to combat "Adverse Yaw" which is generally worse for flat bottom (or under-chambered) airfoils and low airspeed.

In many cases its better to use differential aileron throw than to use the aileron-rudder mix unless you are trying to correct for trims needed when doing knife-edge (when you'd mix rudder to aileron to counter the rudder trying to roll the airplane)

You can use the aileron-rudder mix for low speed flight where you might experience adverse yaw and turn the mix of for higher airspeed.... That can help some aircraft, especially for landing approach. But even then, the use of differential is superior to use of aileron-rudder mix in most cases.

Many computer radios have a differential aileron function which can be put on a switch. Check your radio's instructions.

Differential can be done mechanically or electronically.

Mechanical differential is VERY EASY: (especially with one servo per aileron as with all of these Dynam models)
If the aileron horn is on the bottom of the wing (as with all of the Dynam models) center the servo then adjust the arm so it is pointed forward somewhat (more forward = more differential) Then the linkage will give more push than pull and the aileron will move up more than down.
Match the amount for both sides.
If the control horn is on top then you angle the servo arm back instead of forward

Simple and very effective.

The issue being addressed is a tendency to have the downward moving aileron add so much drag that the airplane might tend to yaw opposed to the commanded direction of applied aileron. In extreme cases this can cause the airplane to turn opposed to the direction desired and applying more aileron trying to get the desired response would just initiate a snap into a spin.

If you are not noticing a problem with adverse yaw there is no reason to do the aileron-rudder mix or to use differential ailerons.
(If it ain't broke then don't fix it)

JetPlaneFlyer 06-21-2014 06:25 PM

Or just use your little used left thumb to apply a bit of rudder in the turns:D

mclarkson 06-21-2014 10:00 PM


Originally Posted by JetPlaneFlyer (Post 951080)
Or just use your little used left thumb to apply a bit of rudder in the turns:D

I knew that was coming.

fhhuber 06-21-2014 11:22 PM

But... you can't ask people to actually fly the airplane. :eek:

mclarkson 06-21-2014 11:41 PM

And that. :D

JetPlaneFlyer 06-21-2014 11:54 PM

Joking aside. I really do think using the left thumb is by far the best approach to rudder 'mixing' in turns. I'm not anti-computer Tx mixes, I use them on all my models for certain things, but the advantage of using your thumb in turns is that you aren't stuck with a fixed rudder input but can vary rudder deflection as required through the turn. Probably more important is that under use of rudder is the biggest failing in RC flying for many if not most flyers, so anything to get the lazy thumb working is a good thing.

Dont take my word for this. Scott Stoops is a world class aerobatic flyer of both RC and full size aircraft and the author of the worlds best book on RC flying (IMHO). The book is called "The Pilot's Guide to Mastering Radio Controlled Flight"

Here's a quote from the book:

Another mission of mine is to increase the manipulation of the left stick by RC pilots...... The rudder is without question the most underused and misunderstood control we have. You've got a throttle and a rudder, lets lean how to use them

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