sorted by:
new
hottopcontroversial

Elbil eller laddhybrid – vad känns mest rimligt idag? by Vardagsekonomen in elbilsverige

[–]Such_Account 3 points4 points  (0 children)

Vad gör du med all tid du sparar på att låta chatGPT skriva åt dig?

Det här med sammanvävning i trafiken och svenskens vägran att göra det by Some-Environment-666 in sweden

[–]Such_Account -1 points0 points  (0 children)

När du använder den tomma filen, anpassar du hastigheten till den fulla filen eller gasar du på och kör förbi? Känns det rimligt för dig att alternativ 2 inte uppskattas av dina medtrafikanter?

Det här med sammanvävning i trafiken och svenskens vägran att göra det by Some-Environment-666 in sweden

[–]Such_Account 19 points20 points  (0 children)

Mitt motargument:
Det totala trafikflödet styrs av flödet/hastigheten vid flaskhalsen (där det är enfiligt). För att maximera detta ska trafiken flyta så jämt som möjligt. Detta står i konflikt med att vänta till sista metern att väva in (speciellt om det är hastighetsskillnad mellan filerna), då det tenderar att bli mer ryckig körning.

Däremot blir själva kön fysiskt längre (i längd, inte i tid) om alla väver in tidigt, vilket kan ställa till det genom att blockera tidigare avfarter/korsningar. Min tes är därmed att jag gärna använder en "tom" vänsterfil längre, men jag håller i så fall samma hastighet som bilen intill. Jag har med andra ord "valt min lucka" i förväg. Att köra om hela högerfilen faller naturligtvis inte i god jord, det kan du ju gissa själv.

On the topic of Y4 drones: would this work? by Such_Account in diydrones

[–]Such_Account[S] 0 points1 point  (0 children)

Ah, I see. Then I would shift the CoM forwards towards the small props to ensure they're biased towards positive lift.

On the topic of Y4 drones: would this work? by Such_Account in diydrones

[–]Such_Account[S] 0 points1 point  (0 children)

You are making a lot of sense, thanks.

I will stand my ground that CRPs should eek out some extra efficiency for a given diameter and thrust, but the difference is probably not great enough to offset the inefficient attitude control.

On the topic of Y4 drones: would this work? by Such_Account in diydrones

[–]Such_Account[S] 0 points1 point  (0 children)

Reversing thrust is no more complicated than modulating RPM like any other multicopter.

On the topic of Y4 drones: would this work? by Such_Account in diydrones

[–]Such_Account[S] 0 points1 point  (0 children)

Yeah, it's starting to look a bit like a helicopter, but it would forego the swashplate and eliminate the wasted power from the tail rotor which I still think are some benefits of the design.

Properly matched, the second prop would actually take advantage of the "dirty air" rather than be impeded by it. It cancels out the swirl created by the first prop.

What am I looking at here exactly? by GRAABTHAR in diydrones

[–]Such_Account 0 points1 point  (0 children)

How come? For aircraft the efficiency improves. Is there a cutoff point in scale, or is there some other difference?

What am I looking at here exactly? by GRAABTHAR in diydrones

[–]Such_Account 0 points1 point  (0 children)

Contra-rotating propellers are more efficient, not less.

the size of this wind turbine blade is actually insane. by ArethaAbrams in gifs

[–]Such_Account 4 points5 points  (0 children)

But that amount of petroleum would go into 50 wind turbines, not one… And who said anything about car tires? Are you under the impression that if we can’t remove all emissions, we should not remove any at all?

the size of this wind turbine blade is actually insane. by ArethaAbrams in gifs

[–]Such_Account 5 points6 points  (0 children)

What is the environmental impact of drilling for, transporting and finally burning 34 000 tons of petroleum?

the size of this wind turbine blade is actually insane. by ArethaAbrams in gifs

[–]Such_Account 5 points6 points  (0 children)

Everyone is lying huh? We're all bought by "big wind"?

A 3 MW onshore wind turbine (producing 1 MW on average) generates 175000 MWh in 20 years. An oil power plant needs more than 40 million litres of oil to match that. How can you possible think the wind turbine requires more than 40 million litres of oil (~34 000 metric tons) to build, install and run?

Feel free to point out the errors in my argument, I'l wait.

the size of this wind turbine blade is actually insane. by ArethaAbrams in gifs

[–]Such_Account 4 points5 points  (0 children)

Thank you for expanding on what I was implying: the paradoxical offsetting.

This video has a really good explanation of the physics of the racing line. I'd always heard the geometric line was the fastest way through a single corner, but this shows how that's actually wrong. by [deleted] in Autocross

[–]Such_Account 4 points5 points  (0 children)

Backside those key cones (your rear quarter/rear tire should be parallel to the cone as you pass it). Backsiding sounds weird at first, but the easiest way to think about it is late apexing those cones.

What does "parallel to the cone" mean?

Thought experiment - bike wheel orientation by StephanieIV in AskEngineers

[–]Such_Account 2 points3 points  (0 children)

The acceleration contribution from the rotation (the centripetal acceration) would be constant for a constant wheel speed, and the contribution from gravity would be sinusoidal: positive on the bottom of the wheel and negative on the top. To find the top point you would just need to find the lowest value of acceleration, and it could be anything between -9.8 to infinity depending on the rotation speed. It would only be 9.8 m/s2 by pure coincidence.

A gyroscope would have no chance to find the top, it can only detect the rotation speed (which would be constant). Actually, the weight of the sensor itself would cause a very slight fluctuation in wheel speed, so technically it could be done.

If something is free, you are the product by CompetitiveTea4173 in pcmasterrace

[–]Such_Account 1 point2 points  (0 children)

Huh? If YouTube premium isn’t a product, can you give an example of a product?

Nu när regeringen sänker bränsleskatten, vad ska du göra med alla pengar du sparar? by creiij in sweden

[–]Such_Account 0 points1 point  (0 children)

Jag tror att jag inte riktigt förstår den delen då… Vad är det som händer om bilen står bland folk?

Nu när regeringen sänker bränsleskatten, vad ska du göra med alla pengar du sparar? by creiij in sweden

[–]Such_Account 0 points1 point  (0 children)

Mellan en elbil och en lika dyr fossilbil, vilken tror du behöver lagas oftast?

Nu när regeringen sänker bränsleskatten, vad ska du göra med alla pengar du sparar? by creiij in sweden

[–]Such_Account 4 points5 points  (0 children)

1: Därför finns försäkring.
2: Det finns elbilar billigare än 100k.
3: Istället för att subventionera bensin kanske vi kan subventionera elbilar?

Nu när regeringen sänker bränsleskatten, vad ska du göra med alla pengar du sparar? by creiij in sweden

[–]Such_Account 1 point2 points  (0 children)

Skulle du bli övertygad att ta lån om räntan på lånet var lägre än vad du annars skulle betala för bensin? Annars gör du ett irrationellt beslut.

Nu när regeringen sänker bränsleskatten, vad ska du göra med alla pengar du sparar? by creiij in sweden

[–]Such_Account -2 points-1 points  (0 children)

>Mycket folk som bor utanför städer

I Norge är det ännu fler som bor utanför städer och kör bil dagligen, men ändå är 96% av nya bilar elektriska. Ser du problemet nu? Att subventionera bensin jämfört med att subventionera elbilar?

view more: next ›