Yaw tuning in 3inch quadcopter

[shanker (Gowrishanker p)]

hello,
I made a 3 inch quadcopter with speedybee f405 mini and flashed latest firmware 4.5.2.
After reading the documentation, i saw yaw usually don’t required tuning.
quad is flying ok, but i feet like some noise is coming from motor. after landing i checked the motor , as per the layout motor 3 and motor 4 is more hot than motor 1 and mot 2.

frame was good and properly screwed . motor & propeller screwed well. also noted the vibration status but it value come under 30.

question : Do i need to tune this quad before flying in alt hold and pos hold.?

also on log file it show radio failsafe in some point. i don’t lose control throughout flying. and i have telemetry connected to laptop , there is no warning showed on HUD . any further details required for this please ask.

advance thanks
1 1-1-1970 5-30-01 AM.bin (868.6 KB)

[amilcarlucas]

Such a small quad does require tuning.

The ArduPilot Methodic Configurator software provides a template for a 3’’ quad, with the correct sequence to tune it.

Read the user manual and start using it.

[shanker (Gowrishanker p)]

thankyou @amilcarlucas ,
i would like to know is there any problem in my quad…did you find anything specfic issue in log file?

[amilcarlucas]

The main issue is that it is not tuned and vibrates like crazy.

Section1 of the Blog post will help you.

[shanker (Gowrishanker p)]

Do i downgrade firmware version… On it’s title show it is based on ardupilot 4.4.x.
I am using 4.5.2…
Or i can use same method to tune this .
also could you please specify where i can see the vibration on log file that you mentioned in last .

advance thanks

[amilcarlucas]

No need to downgrade, everything is valid for 4.5.2

Read the blog post. It explains vibrations in a couple of points. I will not repeat myself here.

[Janno (Jan Ole Noack)]

@shanker

also could you please specify where i can see the vibration on log file

You already posted a picture of it. Ideally you want to get below 10 on all axis.

@amilcarlucas

• Vibrations over 30 are very bad
• Vibrations over 20 are causing issues even if you don’t know it yet
• Vibrations over 15 are in a grey area - it could go either way - check clipping, it must be zero
• Vibrations below 10 are good

[shanker (Gowrishanker p)]

thank you @Janno

Measuring Vibration — Copter documentation,
But here they saying it 30m/s/s are acceptable. that’s make me more confused. that’s why i asked him where i can find the vibration that he mentioned. ( Is there any option for vibration checking other than VIBE in log)

[amilcarlucas]

No, Vibe is the only method.

But you should also look at the fft produced by the filter analysis webtool

[dkemxr (Dave)]

@shanker

But here they saying it 30m/s/s are acceptable.

That’s generally wrong. Vibe levels that high will create difficulties in obtaining the best tune.

[shanker (Gowrishanker p)]

@dkemxr thank you, so the documentation is wrong or it is based on any specific condition?

[dkemxr (Dave)]

It’s wrong. 30 is not a good target to be below.

Your motor heating problem is not directly related to vibe levels. The outputs are oscillating badly:

Tune the craft.