The world is cruel and ugly. There are plenty of justifiable things to be upset and distraught over. I don’t want to hear about those. I want to know what bizarre out of left field takes you have that infuriates you.
I’m still upset about Tenochtitlan falling and being buried. I’m a gringo, I shouldn’t have an opinion about Lake Texcoco being drained centuries ago.
That vacuums are so terribly loud and whiny (and unnecessarily tiny space heaters). Older vacuums used to be bigger and run slower, but in my experience vacuumed as much or even better. Nowadays they put several kilowatt motors in there that somehow don’t do as much but produce immense noise and heat.
If someone vacuums with their window open I can tell from over 100m away by the whine. Fuck that.
I used to hate vaccuming because of that. I’m glad to have an actually quiet vacuum now (a Henry). They’re rare, but they do exist.
I mostly work in social services, but during times of intentional or unintentional unemployment, I run a handyman service and fix a range of smaller consumer gadgets and household appliances. Not an exaggeration to say that over the last 6 months 50% of my income was derived from buy/sell/repair of vacuums. I am not lying when I say I have a small vacuum shrine, somewhat as a gag but also in respect for the fact that vacuums kept me fed.
There’s a few aspects to vacuums that play into your concerns.
The heating issue arises from the use of standard AC brushed motors in the cheaper builds, vs DC brushless motors in the higher-end. Basically AC motors are mini-heaters that spin a bit, and DC motors spin a lot and generate a tiny bit of heat. There’s a cool Tech Ingredients video where the presenter discovers this by tinkering with ceiling fans, learning how much air they move, power consumption, and so forth. Worth a watch even just for curiosity.
The next issue is airflow. There is a complex chain of intake, impeller, dust bin, outflow, filters, etc. Impairments and poor design in any of these areas restricts airflow and makes the motor work harder.
The impeller is the “fan” that moves air and it’s attached to the motor. The faster you move air, the more resistance, the more resistance, the more the impeller converts movement into sound. It approaches a threshold where it can’t efficiently push the air any harder, and the energy needs to go somewhere so it ripples through the air medium.
And with fluid dynamics, the more resistance the more turbulence, which of course leads to more resistance.You can mentally plot an efficiency curve where moving almost no air would have incredibly high efficiency, but see it drop off sharply you approach the max, where you can dump as much energy as you want into that impeller, but it’s maxed out and is now a noise-maker. A thought exercise would be to imagine a 1cm^3 motor that is expected to fill a Zeppelin in 30 minutes - we can intuit exactly why that’s insane and could never happen.
The compactification of devices is the next huge area. If the consumer wants incredible suction in a tiny device, it’s going to be a grid-melting racket-box. Physics is not to be argued with.