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In Europe where noise is a bigger issue you often see four blade props on small single engine planes. That, combined with mufflers make a huge difference in ov

In Europe where noise is a bigger issue you often see four blade props on small single engine planes. That, combined with mufflers make a huge difference in overall noise. It costs on the order of 3% of performance.

est 4y ago
> In Europe where noise is a bigger issue I think the noise is also an important issue for CPU cooling fans or electric fans for homes. Would love to see such propeller made into everyday small fans.
- dotancohen 4y ago
  This tech requires a significantly wider propeller assembly - quite the opposite direction that consumer tech is going in for all but the most powerful machines. I suppose that gamers might accept a significantly larger case for quieter cooling, but for general purpose computing I think that larger, fanless heatsinks and smaller, more efficient CPUs are the answer.
- ruuda 4y ago
  I'd love to see this tested at the Fan Showdown [1], it's a youtuber who 3d-prints user-submitted fan designs. Or given that the article is from 2020, maybe it was tested already. [1]: https://youtube.com/@MajorHardware https://youtube.com/@MajorHardware
  - Galaxeblaffer 4y ago
    amazing YouTube rabbithole.
  - bebna 4y ago
    I don't remember a tipless one and I think I've seen them all. There is also a subreddit to post and comment other peoples designs.
- blagie 4y ago
  I don't think this design would help with a CPU cooling fan. There's a reason they went from planes to water, and I think that same reason would apply even more so for a CPU fan. If you're going to spend the space, simply use a bigger fan at lower RPMs. Electric fans for homes are a more interesting question. I was going to suggest that a Vorando or Dyson already has a lot of elements of this, and gives more bang for the buck, but I think the two could be combined. A Vornado-style fan really reduces vortex shedding, but probably has some turbulence internally. A modified prop design could reduce that a lot.
dghughes 4y ago
I'm not in a European country I'm curious do you know if small aircraft are allowed to use leaded avgas 100LL?
- alistairSH 4y ago
  100LL is still allowed, but like the US, there are on-going discussions about bans.

est 4y ago

> In Europe where noise is a bigger issue I think the noise is also an important issue for CPU cooling fans or electric fans for homes. Would love to see such propeller made into everyday small fans.

dotancohen 4y ago
This tech requires a significantly wider propeller assembly - quite the opposite direction that consumer tech is going in for all but the most powerful machines. I suppose that gamers might accept a significantly larger case for quieter cooling, but for general purpose computing I think that larger, fanless heatsinks and smaller, more efficient CPUs are the answer.
ruuda 4y ago
I'd love to see this tested at the Fan Showdown [1], it's a youtuber who 3d-prints user-submitted fan designs. Or given that the article is from 2020, maybe it was tested already. [1]: https://youtube.com/@MajorHardware https://youtube.com/@MajorHardware
- Galaxeblaffer 4y ago
  amazing YouTube rabbithole.
- bebna 4y ago
  I don't remember a tipless one and I think I've seen them all. There is also a subreddit to post and comment other peoples designs.
blagie 4y ago
I don't think this design would help with a CPU cooling fan. There's a reason they went from planes to water, and I think that same reason would apply even more so for a CPU fan. If you're going to spend the space, simply use a bigger fan at lower RPMs. Electric fans for homes are a more interesting question. I was going to suggest that a Vorando or Dyson already has a lot of elements of this, and gives more bang for the buck, but I think the two could be combined. A Vornado-style fan really reduces vortex shedding, but probably has some turbulence internally. A modified prop design could reduce that a lot.

dghughes 4y ago

I'm not in a European country I'm curious do you know if small aircraft are allowed to use leaded avgas 100LL?

alistairSH 4y ago
100LL is still allowed, but like the US, there are on-going discussions about bans.