On Wednesday, 24 June 2020 01:25:52 UTC+1, John Rumm wrote:
On 23/06/2020 20:41, tabbypurr wrote:
On Tuesday, 23 June 2020 14:24:11 UTC+1, RJH wrote:
On 22 Jun 2020 at 17:29:59 BST, "tabbypurr wrote:

If an engineer isn't able to design a silent fan they had better stay out
of that business.

Moving any volume of air around inherently creates noise. An engineer
would know this, otherwise they best stay out of that business.

I take it you're not an engineer then. Or an ignorant one.

Hint: try turning a desktop fan round by finger & see how noisy it is. No
wind noise.


Oh well yes, even I could do that. Doesn't make me (or you) an engineer. Or
the room meaningfully warmer.

It makes the point that fans can be silent.

Perhaps very quite and mostly useless would be closer to the truth.

wrong again

Yes big slower fans are quieter than smaller faster ones for the same
air flow, but none are silent.

wrong again

If you are shifting a volume of air, you
will get noise from that even without the fan... Ever heard the wind blow?

noise ceases to occur when airspeed is low. And obviously most fans are not noise optimised. Even my first 1k rpm fan was completely silent.


Sorry, I thought that was utterly & completely obvious.

Yeah Nige, you would.

If someone can't follow an elementary point... shrug.

Why do you keep calling me Nige?


NT