Iris Loiter Problem

Posted by Beau on April 3, 2014 at 2:06pm

I bought the Iris as a durable platform for FPV but with my first few flights I have a problem that makes it un-useable for FPV.

In Loiter mode, with the left stick at 1/2 throttle, any forward movement beyond a slow crawl causes the iris to gain altitude.  When I stop touching the right stick it then returns to the altitude it started from.

Here's an an example...

I find a steady altitude hold in loiter at about 6ft above the ground in a flat open area, without touching the left stick at all, I use the right stick to fly forward approximately 50 feet, by the time I take my finger off the right stick the Iris is 30ft above the ground, and then it slowly settle back down to the original 6ft altitude

Anyone else experiencing this?  or even better... anyone know how to resolve it?

Any help would be much appreciated, and thanks in advance.

-b

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Replies

  • wayne April 3, 2014 at 2:41pm

    This sounds similar to the problem I'm having with a camera on the front.  Check the angbst parameter in your logs and see if it's causing the Iris to climb.  I think the GPS would eventually bring it back down, like you're seeing.

    http://www.diydrones.com/group/iris/forum/topics/iris-kept-climing-...

    • Beau > wayne April 3, 2014 at 2:43pm

      Well you guested I had a camera on the front so, I'm hoping you're right.

      Please let me know if you find out more.

      Thank you!

    • wayne > Beau April 3, 2014 at 6:55pm

      The first time it happened it would not stop climbing until I pushed the right stick forward (or maybe it was back).  Something to keep in mind if it takes off on you.  I think the "right" thing to do is put your throttle at half mast and then go to stabilize mode.  Don't just switch to stabilize with a closed throttle - drops like a rock.

      Hopefully somebody in the APM programming arena has at least seen this for the next revision.  I don't know that there's a way to fix this this problem in the current code - at least nobody has responded with one of the 200-ish views.

  • Nitro April 3, 2014 at 2:22pm

    Not sure if your throttle trim tab would cause it to gain altitude as you fly forward or not but make sure all your trims tabs are centered.. Even though your throttle is centered your trim tab could be set higher. A lot of guys bump their trim tabs accidentally and run into all sorts of drifting problems.

    I'm no expert (in fact, not even close) but I had a similar problem with a helicopter.

  • Mark Prince April 3, 2014 at 2:17pm

    I see almost the same thing but only in alt hold mode. It keeps the alt good in loiter. When alt hold it just keeps dropping alt when flying forward until you stop it and then it will climb back. Additional throttle doesn't help unless you are just hovering in alt hold.

    mp

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