How Does the Number of Blades Affect Propeller Noise? 4" Sub 250g Do-All FPV Drone Project (PART 4)

Описание: Thanks to PCBWay for sponsoring this video. Check out https://www.pcbway.com/ for custom printed circuit boards, electronics, and rapid prototyping services (Use my referral link to get $5 of New User Free Credit https://www.pcbway.com/setinvite.aspx...!

What are your thoughts on this?

BLUF: More blades equals less noise. There are many caveats to that statement, but that seems to be the continuing theme based on my experience with small drone/plane propellers. But why? Well, it appears that two bladed propellers tend to produce a more distinct and concentrated tone which is more noticeable, even if it may not be actually louder in volume. Interesting stuff. Here's the research I mentioned:
Effects of number of blades on propeller noise paper: https://www.sciencedirect.com/science...
and
What Is Tonal Noise? https://cirrusresearch.com/tonal-nois...

I'm experimenting with the idea of a small FPV drone that can be sub 250 grams AUW with a small battery, while also being able to carry a gopro and larger battery when needed.
In this video I'm testing different 4" size propellers to see which ones are quietest (or, least annoying!) at a hover or slow speeds.
Propellers tested:
Gemfan Hurricane 4023 x 3
Gemfan Hurricane 4024 x 2
HQProp T4x2.5GR-PC x 2
Gemfan Floppy Proppy F4019-3
HQProp DT90mmx5

Learn more about this design in these previous videos:
Part 1    • Adam's Do-All Sub250 4" inch 60g 3D Printe...  
Part 2    • My 4" Do-All FPV Drone Project // Carbon F...  
Part 3    • FPV Flight and Durability Testing Adam's D...  

3D-Fuel is my favorite PLA+ for durability and practical prints: https://www.3dfuel.com/RCWITHADAM use code RCWITHADAM for 10% off.

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*DISCLAIMER: Remember to always use caution and your best judgement when building and flying RC aircraft, and when working with 3D printers, electronics, or electrical devices. Be mindful of the laws, regulations, and best practices for your particular location. Be a good neighbor, and HAVE FUN!*
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About RCwithAdam: Adam's goal is to HELP YOU build your skills and eliminate frustration and confusion through creative, educational, and encouraging videos featuring Radio Control airplanes, FPV drones, electronics, and 3D printing!
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