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# State of the Art
1. RCBench macht probleme. --> konstant verbindungsprobleme und stürzt ab. Zu viel vibration hinter scich? Crack irgendwo?
2. Konnte keine wirklich messbare kraft/moment in pitch oder roll messen too much noise
1. Soll ich highpass filter verwenden um etwas zu erkennen? #question
3. Äussere achse verbogen, kriege teil nicht weg: teil ist nachgeschickt worden von inigo, kommt morgen an
4. Werde morgen mit alter testplatform und unterem propeller fixed pitch testen abzuheben.
5. Neue motoren sollten morgen ankommen.
# Probleme
- Krasse vibrationen, vorallem wegen teststand, sobald mit virt-swash getestet wird.
- Fixed blade holder ist kein problem, resonance peaks können übersprungen werden
- Rcbench beschädigt?
- Position sensor not perfectly mounted --> non-linear distortions
- Create sensor calibration method (use stepper motor to control exact position?)
- Non linar distortion induce vibrations
- Vibrations
- RCB mount too flexible
- Props not perfectly balanced (3D prints are not precise)
- Haven't found a good way to balace articulated lead-lag props
- Actuation not perfect due to position sensor distortion (see above)

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Swash leveling
[https://www.rchelicopterfun.com/blade-tracking.html](https://www.rchelicopterfun.com/blade-tracking.html)

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Animations
[Coaxial Helicopter Rotor Animation](https://www.youtube.com/watch?v=akgJO5GCe6I)
![Embedded YouTube video](https://www.youtube.com/embed/akgJO5GCe6I?feature=oembed&autoplay=true)

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First tests until 15:21 (time) were with
![Exported image](Exported%20image%2020231126172026-0.png)
Second part: starting from 15.23 I used all default parameters.

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> [!caution] This page contained a drawing which was not converted.
![Exported image](Exported%20image%2020231126172028-0.png)
# Buylist
- [ ] Grease, wd40
- [ ] Metall röhrchen (ptfe,
# Mechanical Part
Blade holder pin to 11.5mm
3.4mm
10mm
11.5mm
4.5mm
45°
![0 01
AS604EtS_E K—AB ](Exported%20image%2020231126172028-1.png) ![A utoSave '"'38)
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Page Layout Formulas
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Review
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General
Motor Rotation Calculations 2
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Problems:
- Sinusoidal noise in the position encoder, as seen [here](https://www.melexis.com/en/product/MLX90324/Triaxis-mainstream-rotary-position-sensor-IC-Analog-PWM-SENT)
- Do calibration and use calibration points to linearize output from position encoder.
![ESC
1085
Servo 1
1 500
Servo 2
1550
Servo 3
1047 ](Exported%20image%2020231126172028-3.png)