some questions regarding Quatos tuning

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some questions regarding Quatos tuning

Postby jet » Wed Jul 08, 2015 4:38 am

Hi, all.
This is my first time to use Quatos.
I had some problems:
1.Based on AQ wiki, for Quatos Thrust curve measurement, "Note down these numbers and copy them into the RPM and thrust culumns of this spreadsheet."
I can arm and start motors; but, what command to down these numbers?

2.When I armed my motors with Quatos FW and ESC32, from the mid-throttle to the max-throttle, the speeds of motors were same. If I used non-Quatos FW, the speeds of motors changed depending on the value of throttle.
What is the problem?

Thanks for help.
Jet
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Re: some questions regarding Quatos tuning

Postby chschmid » Wed Jul 08, 2015 7:04 am

Hi Jet

To find the quatos numbers you need a thrust measure rig.
http://autoquad.org/wiki/wiki/quatos-adaptive-control/quatos-thrust-curve-measurement-and-interpolation/

Then you run your motor from QGC or putty at different RPM's. Note RPM and thrust. You must calibrate your ESC32 first.

Post your mot and prop here, maybe someone already did that combo.

Cheers
Christof
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Re: some questions regarding Quatos tuning

Postby jet » Wed Jul 08, 2015 7:19 am

Hi, Christof.
Yes, I had calibrated my ESC32.
My motors are LD Power MT3110 and props are tarot 12x55.
My question is how to copy the numbers into a spreadsheet as figure shown.
For example, I can arm and start motors with RPM300.
Then, how to understand the thrust, Scale rpm by 10, etc?
Thanks for help.
Attachments
thrust_sheet1.png
Thrust spreadsheet
thrust_sheet1.png (67.38 KiB) Viewed 3520 times
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Re: some questions regarding Quatos tuning

Postby aBUGSworstnightmare » Wed Jul 08, 2015 1:06 pm

jet wrote:Hi, Christof.
Yes, I had calibrated my ESC32.
My motors are LD Power MT3110 and props are tarot 12x55.
My question is how to copy the numbers into a spreadsheet as figure shown.
For example, I can arm and start motors with RPM300.
Then, how to understand the thrust, Scale rpm by 10, etc?
Thanks for help.


Hi Jet,
as Christof already pointed out you Need to use a thrust measurement jig. I'm using a good Quality (1g Resolution) digital kitchen scale and this test stand http://www.krick-modell.de/frameset.asp ... m%3D491018

You then Need to prepare the Excel sheet, and make the measurements.
I'm using a terminal Programm, connected to the ESC32 and the RPM command. The spreadsheet then calculates A1/A2. Another example is here viewtopic.php?f=25&t=4543&start=10#p33920

So you Need to
- ARM
- RPM300 --> note the value from your scale into the spreadsheet
- RPM600 --> note the value from your scale into the spreadsheet
etc.
- RPM <highest achivalbe RPM value; known from R2V calibration (= PWM_RPM_SCALE)>
- STOP
- DISARM

Done!
No Need to bother with the rest since this is the MATHS behind A1/A2 calculation.
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Re: some questions regarding Quatos tuning

Postby jet » Wed Jul 08, 2015 1:49 pm

HI, aBUGSworstnightmare.
Hmmm...thanks for your clear description!
I got it!
I will try soon.
Thanks again.
Jet
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Re: some questions regarding Quatos tuning

Postby aBUGSworstnightmare » Wed Jul 08, 2015 7:32 pm

o.k. QUATOS adds a little work but the tuning is pretty easy.
Made the maiden with the Nylon RCTSpider today -- looks like a good .xml-file and a nice parameter set.
Have a look at it here viewtopic.php?f=25&t=4543&p=34000#p34000
'Tuning' was quite simple: Lowering A1/A1 and gain --> adjusting it before take-off with trims (based on sound and vibration (if you can see some) --> liftoff.

O.K. some more tuning is required but you're faster done as when using PIDs
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