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by Punx0r
Dec 07 2019 5:14am
Forum: E-Vehicles General Discussion
Topic: Tesla charging problems ?
Replies: 10
Views: 116

Re: Tesla charging problems ?

I caught a bit of the world news earlier this week that showed not so long ago people in South Africa having to queue for 3 hours EVERY MORNING to fuel up their vehicle just to work for the day. I bet those guys would have quite liked a vehicle you could slowly fuel up overnight at home. It's almost...
by Punx0r
Dec 05 2019 11:31am
Forum: Battery Technology
Topic: Can heating up battery give longer distance?
Replies: 11
Views: 466

Re: Can heating up battery give longer distance?

Holding an 18650 cell at 50*C significantly reduces it's calander life - check the datasheets. Tesla warns that frequent supercharger use will prematutely wear the battery. The compromise is that only occasional use at high temp. and/or c-rates doesn't horrendously shorten battery life. In terms of ...
by Punx0r
Nov 30 2019 6:57pm
Forum: Motor Technology
Topic: OSU electric motor
Replies: 2
Views: 195

Re: OSU electric motor

Very interesting

Am I reading this right? No winding insulation (anodised?)? SIC MOSFETs? 43200V?!
by Punx0r
Nov 29 2019 2:36pm
Forum: General Discussion
Topic: Helicoil Length?
Replies: 6
Views: 211

Re: Helicoil Length?

It does make sense. You now know how long any size of helicoil is in both standard and long length without having to look it up.
by Punx0r
Nov 26 2019 1:49pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 1144
Views: 78868

Re: Tesla Model 3

and the IMF? What's Tom Cruise got to do with it?! :lol: The styling on the CT is bold and challenging. But despite being physically huge and bulky it is surprisingly svelte from some angles. It is nothing if not unique though and it's either going to bomb or become a classic. If the latter then Te...
by Punx0r
Nov 22 2019 2:15pm
Forum: EV Business World
Topic: Tesla Cybertruck
Replies: 48
Views: 2333

Re: Tesla Cybertruck

There won't be any easy changing of body panels as it's a monocoque - a design apparently so revolutionary in the pickup world that Elon took great pains to repeatedly explain the principle of it :lol:
by Punx0r
Nov 22 2019 9:43am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

It is not "MY" future. It is the future. I am not a "doom monger". I am a truth monger...I have been studying diligently with a systems view for 4 years. PHD's such as Nate Hagens and Richard Heinberg But truth comes from evidence, not from narrow sources of opinion. I would encourage you to read m...
by Punx0r
Nov 22 2019 3:57am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

The Industrial Revolution was powered initially by water and wood. Which they will eventually return to in a few hundred years. Widespread use of coal engines was instituted in the mid 1800's. You say the world was about to fall into a Malthusian Trap in 1800, when the population was ~1 billion, be...
by Punx0r
Nov 21 2019 4:14am
Forum: Motor Technology
Topic: aluminum windings
Replies: 3
Views: 346

Re: aluminum windings

Electrical conductivity of aluminium is about 60% that of copper so the improvements in fill factor and thermal conduction would have to be large for the claims to be accurate.
by Punx0r
Nov 21 2019 3:46am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

This is obviously an outdated method of determining the Carbon responsibility for any given product. The final destination of the Carbon fuel, goods, or raw materials, must take credit for the Carbon. It will when the price of imported goods includes carbon pricing to cover the emissions of manufac...
by Punx0r
Nov 20 2019 5:32am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Yes, steel and cement production are difficult industries to decarbonise because their emissions are not just from the huge amounts of energy they require, but because the very chemical reactions used to form them release CO2 but there are viable alternative processes (steel more so). They will cost...
by Punx0r
Nov 19 2019 3:43am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Sarcasm my part. It's the logical conclusion to the oft-stated argument "I'm not priviledged - anyone could have what I do if they worked as hard as I have".
by Punx0r
Nov 14 2019 7:27pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Hillhater wrote:
Nov 14 2019 3:48pm
...a “quick look” at “Rich man Poor man”, very quickly explains the difference between hard work, and working for success.
Is this the idea that if everyone worked sufficiently hard/smart they too could have above-average wealth???
by Punx0r
Nov 14 2019 1:12pm
Forum: E-Vehicles General Discussion
Topic: Total fuel economy of towing a Model 3 with a Ford Raptor
Replies: 1
Views: 262

Total fuel economy of towing a Model 3 with a Ford Raptor

Firstly: can you charge a tesla by towing it?

Secondly: Is it more fuel efficient to just drive an ICE raptor alone, or use the Raptor to charge the Tesla and then drive the Tesla? The answer may surprise!

by Punx0r
Nov 14 2019 9:38am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

What is it that successful people say about “making your own luck “ In reality,..if you dont take a chance, luck cannot help you .! A look at the research on the subject, or just a quick a look around you would make it obvious that successful and/or wealthy people nearly always justify their privil...
by Punx0r
Nov 14 2019 4:15am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Hillhater wrote:
Nov 13 2019 6:21pm
There is always a concentration of money/power to a few players, and one winner eventually.
Either the one willing to take the most “risk “, or the one who knows the smartest way to play the game.
You forgot probably the single biggest factor: dumb luck
by Punx0r
Nov 04 2019 3:29am
Forum: Battery Technology
Topic: Nexxtech Charger AA/AAA charger for 18650?
Replies: 9
Views: 348

Re: Nexxtech Charger AA/AAA charger for 18650?

There's a big difference between a cell that's temporarily been taken down to low voltage for a few hours and one that's self-discharged down to that level over a long period.
by Punx0r
Nov 03 2019 1:07pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5425
Views: 238564

Re: Wind and Solar vs Coal, Gasoline, Nuclear

European coal plants to lose over 6 billion euros in 2019 as they are undercut by cheaper gas and renewables: https://www.bloomberg.com/news/articles/2019-10-23/coal-power-plants-face-7-3-billion-losses-in-europe-this-year Note the comment about Poland being an exception due to generous government s...
by Punx0r
Oct 30 2019 10:10am
Forum: E-Bike Technical
Topic: How to stop motor shaft nut from coming off?
Replies: 18
Views: 648

Re: How to stop motor shaft nut from coming off?

Is there a key in that keyway? Is the shaft and sprocket tapered?

As a first-try solution I'd thorough degrease all parts and use loctite on the threads. Blue is normal strength, red is much stronger but beware you'll need to apply heat if you ever wanted to get it apart again.
by Punx0r
Oct 30 2019 10:00am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 1559

Re: Sensorless From Standstill (SFS) explained

My idea now is that by spreading this pdf around I hope the technology, if not patented already, becomes unpatentable and will remain in the public domain. Meaning we (EV hobbyists) can keep playing around with it. This is also the reason the pdf mentions many untested alternatives, to make those u...
by Punx0r
Oct 30 2019 4:18am
Forum: Motor Technology
Topic: 4x less coasting resistance
Replies: 53
Views: 3307

Re: 4x less coasting resistance

The cogging torque resistance greatly varies with the motor design and can sometimes be substantial. I can coast roughly 3x further with a regular wheel vs a pm hub motor. That’s a lot of lost momentum A normal skateboard has very low friction on a smooth surface and it only takes a small increase ...
by Punx0r
Oct 29 2019 12:40pm
Forum: Motor Technology
Topic: 4x less coasting resistance
Replies: 53
Views: 3307

Re: 4x less coasting resistance

Tbh I think you're trying to fit reality to your theory that cogging is a significant cause of drag/loss in an unpowered motor. I suspect you are correct that there is a (tiny) extra copper loss, probably at low speed, in a powered motor to momentarily overcome the cogging torque, but at some speed ...
by Punx0r
Oct 28 2019 3:50am
Forum: Motor Technology
Topic: 4x less coasting resistance
Replies: 53
Views: 3307

Re: 4x less coasting resistance

I was just saying that in general terms if your motor experiences drag from cogging then that loss will manifest as heat - so if your motor doesn't get hot then you can't have a significant loss.