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Throttle Mixing

fliteadmin

Administrator
Staff member
Admin
Moderator
#1


Throttle mixing is something that can really improve your flying experience, but most people don't do it. Let's say you have a plane that flies great but has a few flaws, like with our Retro Pioneer which takes a nose dive whenever you chop the throttle. Well, throttle mixing can correct this issue!


You may be thinking that throttle mixing is the same as trimming, but it's not. If you trimmed out a nose heavy plane on a glide your plane would then porpoise up every time you gave it throttle. Throttle mixing allows you to setup the adjustment to the elevator only when the throttle is chopped, so when you throttle up, the elevator would return back to it's original trim and allow the plane to fly correctly.

Throttle mixing can also be setup to correct issues like involuntary banking caused from engine torque, which was the case with our E-flite Carbon-Z Scimitar.

You can also create compound mixes, tying your throttle to ailerons, rudders and elevators to effect multiple control adjustments at once. But at that point you may just want to go back and check the balance and basic setup of your RC plane.

The problem with our Pioneer seems to be thrust angle issue, because everything about the plane flew great but when you chop the throttle, the air into the engine isn't pulling in that direction and plane suddenly wants to "take a dirt nap" (nose dive). So, we need to make a mix, we need the elevator automatically compensate low throttle. So when the throttles chopped it will have a little bit of up-trim in it giving our plane a nice glide-slope and making it an all-around great flyer.

With our computerized DX-8 we are going to dial in our mix. A quick tip, put this mix on a switch so if you don't like it you can switch back to the original setup. While making your mix adjustment, watch the plane to be sure the control surfaces are doing the movement you want. After your mix is setup, take your plane up a few mistakes high and switch on your new mix and see how it handles.


Links to some of the items mentioned in this episode:

The Retro Series - Pioneer 1020mm EPO (PNF)

E-flite Carbon-Z Scimitar

The Spektrum DX8

Balancing Your Plane

Balancing Props
 

Attachments

lobstermash

Propaganda machine
Mentor
#2
My eHawk 1500 does exactly what the Pioneer does when you chop the throttle! But when thermal gliding, I like that characteristic. It makes it easier to grab a bit of speed without hitting the throttle. I can see how it wouldn't be so great for a beginner plane though. Nice episode.
 

bicyclemonkey

Flying Derp
Mentor
#4
This was perfect timing for this video! I just started flying my Sig Four Star 120, it has a G23 on it and if I go below 2/3 throttle it wants to slightly dive just like the Pioneer did in this video. Now I know what to do!!!
 

RBM

Junior Member
#5
great video.! funny i just had to play with mixing for the first time 2 days ago with my scratch built dr1 fokker.=]
 
#7
A most useful episode, which convinced me to have a go at mixing. Quite easy after Josh's introduction to the process. Thank you, and keep up the great work.

Trevor
 

themajik1

Monkey/Bear Poker
Mentor
#8
I have a DX6i and it doesn't seem to have the same type of mixing... I am trying to mix a little rudder and aileron to my F4U corsair to compensate for torque on takeoff off of a grass field. any help?