Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Tiny electric motor can produce more than 1,000 horsepower

supercarblondie.com

Post reply on HN
Print view View original

171–180 of 616 posts

Re: Tiny electric motor can produce more than 1,000 horsepower

#171

Post by itsoktocry »

mrtksn wrote: post #50
agys wrote: post #18

Everything but the Metric System: “The new YASA axial flux motor weighs just 28 pounds, or about the same as a small dog.” :)

I wonder if Americans don't have a mental image for measurement units so that they alway use some physical object as a reference. Sure, its useful to use a common object as a reference but I don't see that much often in other places. Most people usually understand what it means something to be 20 meters, 5kg or 2 liters intuitively. Like, when I hear that something is 60m tall I intuitively think if it as 20 story ap…

What's the difference between 18 elephants stacked versus a building with 20 stories? They are just different analogies.

Re: Tiny electric motor can produce more than 1,000 horsepower

#173

Post by lazide »

7952 wrote: post #112
thelastgallon wrote: post #96

Earlier quoted context omitted.

> This is awesome. Lighter motors also make electric flight more viable The next innovation we need is Aerial refueling[1] for electric planes. High density swappable batteries and high altitude wind/solar plants that can swap batteries mid air. Perhaps some billionaire will develop a large fleet of these to service all flights! If no western billionaires, we just have to wait for China to develop this tech. [1] http…

Surely it would be easier to recharge rather than swap batteries? I wonder if in the future war will be like a turn based strategy game as everyone wait for drones to recharge before making a move.

Difficulty for swapping batteries too - how to differentiate between strategic bombings and a refueling accident.

Re: Tiny electric motor can produce more than 1,000 horsepower

#174

Post by itsoktocry »

dicknuckle wrote: post #144
xandrius wrote: post #99

Earlier quoted context omitted.

I don't think it's fair to insult all US citizens because of your personal shortcomings.

Do you not have personal experience with people under 40 in America? I would bet $20 over 95% of them don't know how to balance a check book.

Why are you going on about "balancing a check book?"

I'm in my 40s. Never did it, never going to.

Re: Tiny electric motor can produce more than 1,000 horsepower

#176

Post by iambateman »

beAbU wrote: post #107
IshKebab wrote: post #85

Earlier quoted context omitted.

Not sure about footballs but 28 pounds is about the weight of a child, a bag of rice, or a dumbbell. Hope that helps!

How much rice do you buy at a time?!

Asian grocery stores carry 25 pound bags of rice and we use about 2 each year. If you eat rice regularly, it’s the way to go.

Re: Tiny electric motor can produce more than 1,000 horsepower

#177

Post by floo »

fainpul wrote: post #149
chris_overseas wrote: post #2

A link to the press release https://yasa.com/news/yasa-smashes-own-unofficial-power-dens...

> 59kW/kg At this point why don't we get rid of the k prefix and write 59W/g? Edit: I was half joking, but various answers mention kW being standard for motors, kg being the SI unit for mass etc. All true, but as used here in a combined unit, which means "power density" it still would make sense IMO. It's not like the "59" tells you that it's a strong motor and hence you want kW to compare it to other motors. You can…

Because kg is the fundamental unit of mass and kW is typically used for electric motors.

Same reason you wouldn't use m²/s³ even though that's also technically correct.

Re: Tiny electric motor can produce more than 1,000 horsepower

#178

Post by itsoktocry »

reactordev wrote: post #101
xandrius wrote: post #99

Earlier quoted context omitted.

I don't think it's fair to insult all US citizens because of your personal shortcomings.

Statistics my man, statistics. I’m not saying there aren’t smart Americans that can grok a 10kg bag, but that the vast majority can not.

I'm Canadian. I don't know what 10kg feels like until I convert it to pounds.

Re: Tiny electric motor can produce more than 1,000 horsepower

#179

Post by huhtenberg »

bigtones wrote: post #100
agys wrote: post #18

Everything but the Metric System: “The new YASA axial flux motor weighs just 28 pounds, or about the same as a small dog.” :)

Americans are very weird when it comes to metric. They often quote mobile phones as having something like "a six inch screen size but now only 12mm thick" - pick a measurement system people !

Canada is even weirder.

After switching to the metric system ('70-80s) some things are still measures in imperial units. If you slice some ham at a counter in a grocery store, it's in grams. You then turn around and get a pound of apples and a gallon of milk. Nuts are in grams, and soda is in liters. Also the body weight tends to be in pounds. Tools are both metric and imperial. Speeds and distances though, thank god, are metric.

All this is just kinda there and everyone's OK with it, but it is an epic mess if you think about it.

Re: Tiny electric motor can produce more than 1,000 horsepower

#180

Post by lazide »

ajross wrote: post #119
davedx wrote: post #6

Could lead to significant efficiency gains for EV's, because 1/4 of the motor weight means better power-to-weight ratio... a lot of things will automatically get better. YASA was founded in 2009, a spin out from Oxford University following the PhD of founder and still CTO, Dr Tim Woolmer. "Over the decades that followed both of these technologies were explored. But despite the potential for weight reduction, smaller…

> Could lead to significant efficiency gains for EV's Not really. EV's are very heavy from non-motor weight. A Model Y weighs ~4300 lbs. A motor that is 75 lbs lighter is a 1.7% savings. That's not nothing, but I wouldn't say "significant". You can do better by swapping for fancy wheels or eliminating some of the glass roof. And really this is true up and down the electric vehicle world. Weight-sensitive applications…

It’s great anywhere you want more power but are limited by space and/or weight for performance reasons. Aerospace, e-bikes, electric race vehicles, electric motorcycles.

But yeah, EVs seem weird except for racing reasons perhaps.

What I can’t figure out is how they dissipate the heat - double digits kw per kg is crazy.

Post reply on HN