I Turned MIT Award Winning Toroidal Propeller Into A PC Fan

[bmwbob]

Where are the drone propellers?

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[slup]

The Toroidal prop trade off efficiency for a quieter operation... but the keyword here is "should be" quieter, most of the drone toroidal props aren't, instead adding more blades to a conventional design usually win in that regard. Then the biggest downside with Toroidal props... the efficiency. Most examples I've seen means a 75% shorter flight time & that with a much reduced stability.

So no... in total Toroidal props on a drone isn't a success so far.

 

[Kilrah]

Then the biggest downside with Toroidal props... the efficiency. Most examples I've seen means a 75% shorter flight time & that with a much reduced stability.

The articles that have been around lately claim higher efficiency in addition to reduced noise.

Looped propellers: A noise-killing game changer in air and water

These strangely-shaped twisted-loop propellers look like a revolutionary (sorry) advance for the aviation and marine sectors. Radically quieter than traditional propellers in both air and water, they're also showing some huge efficiency gains.

newatlas.com

The team analyzed these weird-looking toroidal props to see whether there would be a thrust efficiency penalty. Apparently not: the team's best-performing B160 design was not only quieter at a given thrust level than the best standard propeller they tested, it also produced more thrust at a given power level

 

[MAvic_South_Oz]

Where are the drone propellers?

Intresting Toroidal Prop Design

Just saw this article and thought you may find it as interesting as I did: https://newatlas.com/aircraft/toroidal-quiet-propellers?fbclid=IwAR0esaJfebAdLJ-U-cBB1UVt2MSPWfmj2knDjDw0FH8eV30sgX3Hfa8wWqs

mavicpilots.com

 

[MAvic_South_Oz]

They now pop up on my YouTube recommended too.

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[slup]

The articles that have been around lately claim higher efficiency in addition to reduced noise.

Looped propellers: A noise-killing game changer in air and water

These strangely-shaped twisted-loop propellers look like a revolutionary (sorry) advance for the aviation and marine sectors. Radically quieter than traditional propellers in both air and water, they're also showing some huge efficiency gains.

newatlas.com

Yep ... but not much have yet shown up, most are terrible efficiency wise.

They now pop up on my YouTube recommended too.

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That's how YT's algorithm works... the more you look at a subject, the more of the same they feed you.

 

[GFields]

The Toroidal prop trade off efficiency for a quieter operation... but the keyword here is "should be" quieter, most of the drone toroidal props aren't, instead adding more blades to a conventional design usually win in that regard. Then the biggest downside with Toroidal props... the efficiency. Most examples I've seen means a 75% shorter flight time & that with a much reduced stability.

So no... in total Toroidal props on a drone isn't a success so far.

I agree. Actually, in the YT videos I've watched, they are actually louder.

 

[SethB]

Props that don’t lacerate the skin are one of the two requirements for operations over people. I wonder if the toroidals are less stabby than standard props?

(the other requirement for OOP is meeting kinetic energy on impact standards)