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Can't hover my 3DR Hex in Stabilize mode

Posted by Jim Townsend on May 25, 2013 at 3:14pm

I've got a 3DR Hex with 850KV motors 10" props and I'm using a 35C battery.

The ESC's were calibrated.

The TX is a Walkera Devention 7 and it's been calibrated using MP.

I'm running the latest APM2.5 firmware and Mission Planner version 1.2.52 mav 1.0

The PIDs I'm using right now are the defaults that come with the Hex firmware.

I've got everything hooked up and it flies.  Pitch, Roll and Yaw are great.  In Stabilize mode, it stays nice and level, it's responsive and very easy to control.

But throttle is another matter.  In Stabilize mode, the hex bobs up and down a lot and I need to constantly adjust the throttle stick  to keep it reasonably level.

Today I was trying to put it into a hover.  It will go up or down, but won't sit in one spot. 

My transmitter has a digital readout showing the throttle setting from 0% to 100%..  At 27% the hex will sink, at about 28% it will either rise or sink, and at 29 percent, it will rise.   I spent 13 minutes trying to get a reasonably stable hover and I couldn't.

I'm wondering if there's a PID that needs to be tweaked in order to level out the throttle?

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Replies

  • T3
    Richard Boyhan May 26, 2013 at 5:20am
    The best advice I can give is to learn to fly really well in stabilize mode. I mean really well, cause the day will come when one of the auto modes will fail and you will need good flying skills to recover with. Ah, the wisdom of experience, you just got to love it. LOL
  • pyrosamz May 26, 2013 at 2:51am

    bro im always ever so slightly feathering my throttle to keep it dead level in stabilize, its defiantly envorimentals that will effect a perfect hover, every so often when the conditions are right it will hover in stabilize hands off, throw it into loiter and watch it hold alt nicely.

  • T3
    Richard Boyhan May 25, 2013 at 6:28pm
    I assume your radio transmitter is not a ratchet transmitter. When you move the throttle it clicks when it moves. These ratchet transmitters are for planes. You need a helicopter or non ratcheted transmitter. If that is not your issue then you need to play with altitude hold flight mode. It's virtually impossible to get a perfect hover outside in stabilize mode. There is just to much happening in the environment that makes you copter fly. Air pressure, wind, backwash just to name a few. Good luck and fly safe.
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