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09 Apr 2020 19:33:13
All shipping from china has gone up, so much that some of the heavier goods are now only sent by sea  :rolleyes:
ched:
09 Apr 2020 16:54:13
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27 Mar 2020 21:41:51
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3d - Printworx

Printing 3d Forum

Location of FC - Does it matter?

Started by Beaver2206, Thursday,April 07, 2016, 21:45:25

Previous topic - Next topic

Beaver2206

Hi

Resurrected the Tarot 250 and threw a CC3D atom on there.  Great piece to set up, though I was wondering if mounting the FC near the nose effected performance in any way.  I know with setting up DJI systems you correct the x y z location of the controller.

I am getting some oscillation in the hover and wondered if this may contribute to it at all?

Is there any way to set the FC location in the software?  I am using Openpilot and Libre Pilot.

Pids are low which has helped (in the 20';s rather than 50';s)

Thoughts?
650 Ironman, Inspire 1, Tarot 250, DJI S900
RPQs Qualified with PFAW

DarrellW

It';s always better to have the gyros and accelerometers as near to the cog as possible so the fc has less to correct obviously the further away the harder the fc has to work to correct errors.
I think..........I think I am........therefore I am.............I think!

Cheredanine

For oscillations it matters but not in a predictable way, frames flex to a greater or lesser degree and therefore oscillations effect different parts to a greater or lesser degree.

Mounting in the centre of a box frame puts you as far away from the motet probable sources of vibration (each motor and prop) as possible so this is a good idea

If you only fly rate mode, you only use a gyro, this detects changes in aspect, this is constant regardless of where you mount on a frame

If you use your acc however, for example you use angle or horizon mode, this would respond incorrectly increasingly as it moves further from the centre of rotation

Fletch

I';m sure there is some maths somewhere that says it';ll suck

I';m sure somebody else will tell you it works

Try it and see! 

bazzerh

Your oscillations are due to too high pids. That';s a very light frame so will require lower pids than a frame of the same size but higher mass.
Round By Round Qualifying and Finals For All.

it just makes sense