SteveR43 in another post was working on reducing noise with 4 bladed props, but unfortunately can't login. He accomplished a 13 dB Drop

[GwenHaney]

Results of the former memeber SteveR43's quad prop esxperiment:
I am associated with SteveR43's work. We keep in contact. I'll cut to the chase. He broke down an bought a decibel meter.

Here are his results:

86-87 db with his quad blades

98-100 db with DJI's standard double blade props.

Sorry, Steve can't continue on this forum. He simply can't login. He can't even get to the web page. Wierd.
I'll let you know if he performs any more profound experiments.

LINK to ORIGINAL POST w video: 4 x 4 blade Mavic 3 prop kit completed. 4 Blades on each prop. Video is limited due to my inability to control and film the drone simultaneously.

 

[GwenHaney]

P.S. If I talk with him and he gives me any links to his video's I'll post what you may like and what I deem appropriate.

 

[cporter]

Toroidal props are improving thrust and reducing noise, there is a also a wishbone configuration. Is he working one of those?

 

[GwenHaney]

Toroidal props are improving thrust and reducing noise, there is a also a wishbone configuration. Is he working one of those?

I don't know what else he's doing. I'm surprised duct fan props don't work. The key problem with the actual prop that is moving is it's weight. The motor has to spin up fast and slow down fast. Steve has a problem with sport mode only, because the weight of just one extra prop is too much. It causes ESC and Motor warnings. They are quieter and more agile, but the motors would need replacing as well. That's my 2 cents.

P.S. He tells me , when using the 4 props, all he hears is wind.