dual rates and expo

[charlesgresham]

I am having difficulty flying my TechOne Power pop wing ...the low rate on aileron and elevator is 40 the expo is 20. when I finally get it airborne and increase speed the ailerons go uncontrollable and I crash it before I can respond. It is balanced. are the settings too much , too little? help.

[xviper]

What do you mean by "uncontrollable"? Do you have a stabilizer on it? Is the control rod loose on either end (ie, is there a lot of slop at the servo arm end or the elevon end?)

[charlesgresham]

it is a flying wing, just ailerons and elevators . No slop : by uncontrollable I mean it flies straight for about 10 seconds ,then usually stalls banks left , then stalls to ground. wings are fast flying . I am new at determining the high and low and " expo".

[TiredIronGRB]

it is a flying wing, just ailerons and elevators . No slop : by uncontrollable I mean it flies straight for about 10 seconds ,then usually stalls banks left , then stalls to ground. wings are fast flying . I am new at determining the high and low and " expo".

Have you tried launching at half throttle?

[fhhuber]

Most likely sloppy linkages and/or sloppy hinge lines. Possibly servos not securely mounted. could also be a major structural issue.

The indicated problem is it going uncontrollable as speed increases. 10 seconds is plenty of time after launch to indicate its not a launch issue. That sounds like it is launching fine.

You can try the above suggestions by others. I don't see a lot of hope there.

You can also push the CG forward just a little to see if that helps stabilize it. The listed CG is a starting point. Moving it forward a little is safe. (a little is 3mm or about 1/8 inch at a time)
Again, I doubt this will solve it, but if you miss-adjusted CG, you'll find out fast by the issues being less severe instantly.

[Skyboom]

I am having difficulty flying my TechOne Power pop wing ...the low rate on aileron and elevator is 40 the expo is 20. when I finally get it airborne and increase speed the ailerons go uncontrollable and I crash it before I can respond. It is balanced. are the settings too much , too little? help.

Is your wing type set to an elevon position in your transmitter?

[xviper]

Is your wing type set to an elevon position in your transmitter?

Good point. He did say it's "a wing, just ailerons and elevators". A flying wing doesn't have AIL and ELE. It has "elevons" and the aircraft type must be set in that way. If not, the thing will usually flip upside down as soon as you move the sticks and crash.

[James]

I am having difficulty flying my TechOne Power pop wing ...the low rate on aileron and elevator is 40 the expo is 20. when I finally get it airborne and increase speed the ailerons go uncontrollable and I crash it before I can respond. It is balanced. are the settings too much , too little? help.

Hey Charles, welcome to Squawk. When you bind up your aircraft and move the right gimbal to the left or right is only 1 control surface moving? I think people are right to believe you may have your wing set up for a normal aircraft which has separate ailerons and elevator. With a wing, you need to set up for elevons. So when you move your right gimbal right your right surface should go up and your left surface down. When you move your right gimbal left the left surface should move up and right surface down. Then when you move your right gimbal down, both surfaces should go up and when you move your right gimbal up, both surfaces should go down.

If you have it setup as a regular aircraft I have a feeling when you move the right gimbal to the right, left, up or down you are only getting 1 surface moving and not both?

Let us know, maybe take some cell phone pics. We should be able to get you sorted

[Hippie 64]

As Skyboom said make sure you are set for EVELON . After your sure of that start with no throttle and pushing or pulling the elevator full and make sure that the surfaces move level together . Any variance will give you turning you don't want . Us very low movements til you see what's happening. try adding 5-7 clicks of up trim to launch with then level it back out after you are under control

[ICM]

I fly my eFlite Cirrus and AT-6 with Dual Rates on a DX9 (actually 100, 80, 70% on a 3 position switch) depending on conditions and how I want to fly on a particular day, however I've never used Expo. I think I conceptually understand that if you dial in 30% Expo it desensitizes the first 30% of of stick movement. But how much? I assume there will be some control surface servo travel in the the first 30% of stick movement, but would it be proportional, ie. during the first 30% of stick movement you'd have to move the stick 30% more to get the same control surface servo travel with no Expo?

[xviper]

I fly my eFlite Cirrus and AT-6 with Dual Rates on a DX9 (actually 100, 80, 70% on a 3 position switch) depending on conditions and how I want to fly on a particular day, however I've never used Expo. I think I conceptually understand that if you dial in 30% Expo it desensitizes the first 30% of of stick movement. But how much? I assume there will be some control surface servo travel in the the first 30% of stick movement, but would it be proportional, ie. during the first 30% of stick movement you'd have to move the stick 30% more to get the same control surface servo travel with no Expo?

Expo is a mathematical principle and most transmitters will show you a graph in the "rates/expo" screen. To know what expo does and how it does it for any given number, look at that graph as you move the stick. If you understand a plot of x/y axis in math, that will tell you all you need to know. Move the stick in a particular direction and that is the x-axis. The resultant movement of the control surface will the y-axis. Do an experiment by keeping the rate at 100% and doing an expo at 0%, another at 25% and another at 50%. You will clearly see the difference in the graph as you move the stick. 0% is a 45 degree line and moving the stick gives a linear control surface response. Compare that to the other expos.

[ICM]

Thanks. I'll try it. I've seen the graph before but never understood what the x and y axis represented.

[Jeanes]

First thing first. Set the controls on the ground.... engine NOT RUNNING..HAVE ALL SURFACE SWITCHES FOR RATES ON LOW. Start with ailerons. Set these around 30-50 percent, then move on to the elevator, then do the rudder....next, do the same for expo this time flip all the switches to HIGH RATES... AGAIN starting with the ailerons and in the EXPO MENU. Try the ailerons to HIGH RATES at 75 percent and expo around 40 percent....See how it feels on test flight, land, and adjust the throws to your liking.....