Search found 4942 matches

by Punx0r
Feb 12 2020 1:21pm
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

...not just that car being worthless but the entire concept of an ICE being worthless and forever unworkable :wink:

Or maybe just that those idiot politicians and crooked scientists stitched us all right up by forcing us away from air-cooled twins...

Some people just live to be contrarian :D
by Punx0r
Feb 12 2020 9:48am
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

Tesla and other new EV manufacturere are on the cutting edge of electrical/electronic dvelopment, and people with those skills and competancy to fault find and fix issues are few and far between, with abilities that gets them employment way up the earnings tree beyond a car repair shop. It will be ...
by Punx0r
Feb 12 2020 4:12am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 47
Views: 4156

Re: what is cogging torque?

Maybe it’s due to core losses but so far in papers I’ve read that doesn’t seem the case and why would there be core losses at 0-10 erpm anyway as they would have to be some weird very powerful low speed losses. Assume a little four pole motor and that's 0-2.5 rpm, which is 0-0.017mph for a 60mm dia...
by Punx0r
Feb 11 2020 2:15pm
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

I'd bet you'll be able to get it vinyl wrapped in any colour/design you want for a fee...
by Punx0r
Feb 11 2020 3:36am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 47
Views: 4156

Re: what is cogging torque?

As soon as you start thinking of magnets as an energy source you're in the compay of the perpetual motion crackpots...
Hummina Shadeeba wrote:
Feb 10 2020 9:37pm
I go slower from cogging why?
How have you managed to eliminate all core losses in order to determine this?
by Punx0r
Feb 10 2020 8:37am
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

Wow, a whole 62 vehicles?! :lol:

Yes, because I point out door handles are not a fundamental flaw unique to EVs I must be an idiot... :roll:
by Punx0r
Feb 10 2020 3:33am
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

Fault door handles?! Did you know they have those on ICE vehicles as well?

$100k is Aus dollars, OK. I just had a look on Australian Autotrader and there four Model S's for sale in the whole of Australia?!

Your views and experiences are not representative of most of the Western world.
by Punx0r
Feb 09 2020 7:12pm
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

..your mail order ECU tune shop is not relavent to 90% of owners ! The average driver is not going to pull the ECU out of his car and send it away for repairs, nor is he going to buy a used one to DIY refit..... .....especially if the car is a $100 k EV. Err, a EV worth $100K is more or less brand ...
by Punx0r
Feb 09 2020 6:59pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6298
Views: 346732

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Internet cartoonist Randall Munroe answers absurd questions with technically-correct, if flippant answers. In his recent book, he answered the question of whether a typical U.S. can be can energy self-sufficient. The answer is fun and a little interesting so I thought I''d summarise it here: The Med...
by Punx0r
Feb 08 2020 7:40pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6298
Views: 346732

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Thereby proving that renewable energy just doesn't work. Unlike coal plants, where the first ones built a century ago were already the optimal size and efficiency and have never had to be replaced or added to.
by Punx0r
Feb 08 2020 4:42pm
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

DSG gearboxes are great but I suspect will be expensive timebombs when a lot of these cars get to 10 years old. It'll probably end up being the case that if it goes wrong most people will scrap the car. I've also observed that approx 1990-2005 or so was a good period for cars in terms of refinement,...
by Punx0r
Feb 08 2020 4:25pm
Forum: General Discussion
Topic: Every Screw Max Torque Chart is Different!
Replies: 6
Views: 691

Re: Every Screw Max Torque Chart is Different!

Your first link will do fine and is the simplest. Metric bolts are easy because they have the grade (strength class) e.g. 8.8 stamped onto the head. 8.8 is your standard bolt and most likely what you'll be using. You might see 10.9 or maybe 12.9 if you're specifically buying high tensile bolts. The ...
by Punx0r
Feb 07 2020 2:34pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6298
Views: 346732

Re: Wind and Solar vs Coal, Gasoline, Nuclear

What crack a me up is plastics and bean tins must be washed before collection so we then use heat to warm the water and add more c02 to the problem. I give them a swill in the dishwater just before it goes down the sink. Minimal effort, zero additional water and energy used and my recycling bin is ...
by Punx0r
Feb 07 2020 10:16am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6298
Views: 346732

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Fly ash can be used to replace some of the portland cement in concrete. With portland cement having a carbon footprint of about 1 Ton CO2 per 1 Ton of cement it makes sense. Until you realise the carbon footprint of 1 Ton of flyash is 20-30 Tons CO2! So it works if fly ash is a given, but it's far b...
by Punx0r
Feb 07 2020 4:26am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 47
Views: 4156

Re: what is cogging torque?

From the Abstract & Introduction in your link: Cogging torque has a negative impact on the operation of permanent magnet machines by increasing torque ripple, speed ripple, acoustic noise and vibration. Synchronous motors...are negatively impacted by cogging torque [3 , 4] . Cogging torque reduces t...
by Punx0r
Feb 07 2020 3:29am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6298
Views: 346732

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Fibreglass can be incinerated for energy or ground up and used in cement production: http://yachtrecycling.org/materials-recycle/fibreglass-recycling/how-is-fibreglass-recycling-done/ Obviously, if you live in a country with lax environmental protection then the cheapest option is probably just to d...
by Punx0r
Feb 06 2020 10:28am
Forum: E-Bike Technical
Topic: How do I step voltage down with low losses, weight and size?
Replies: 43
Views: 2152

Re: How do I step voltage down with low losses, weight and size?

Your normal SMPS takes AC, rectifies, chops it up, transforms it then rectifies back to AC. I guess your controller is just without this front end rectifier and so you must provide it. The internal AC can be very high frequency which requires much smaller transformer/inductors than if transforming m...
by Punx0r
Feb 06 2020 9:55am
Forum: E-Bike Technical
Topic: Ebikes are they AC, DC or?
Replies: 56
Views: 2724

Re: Ebikes are they AC, DC or?

AFAIK the motor BEMF is used as the trigger to commutate but I was still expecting a pretty coarse/trapezoidal waveform?
by Punx0r
Feb 06 2020 9:52am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 21
Views: 2039

Re: How to disassemble motor adapter from sprocket/freewheel?

I assume you're trying to save the threaded adapter? Grip remains of freewheel in vice with soft jaws (or blocks of wood) and use a pipe wrench on the collar of the adapter. If you suspect a thread locking compound has been used, first heat the assembly to >100°C. If that doesnt work you have to car...
by Punx0r
Feb 06 2020 5:00am
Forum: E-Bike Technical
Topic: How do I step voltage down with low losses, weight and size?
Replies: 43
Views: 2152

Re: How do I step voltage down with low losses, weight and size?

When I see the tiny size, simplicity, and durability of rectification and voltage regulation is for a car or even a big truck with far bigger current than I plan, I just can't yet let go of the idea that the same must be possible at 5 or 6 times higher voltage for about the same size. The electroni...
by Punx0r
Feb 06 2020 4:31am
Forum: E-Bike Technical
Topic: Ebikes are they AC, DC or?
Replies: 56
Views: 2724

Re: Ebikes are they AC, DC or?

Ohbse wrote:
Feb 05 2020 11:10pm
That trace was a lot more sinusoidal than I was expecting from a cheapo turnigy RC controller!
by Punx0r
Feb 05 2020 11:29am
Forum: Battery Technology
Topic: Nickel vs Nickel mistery
Replies: 5
Views: 359

Re: Nickel vs Nickel mistery

Most likely it's going to be a difference in temper. Take a look at Table5 in the link below to get an idea of how much difference this can make: the yield strength is the number that determines how hard it will be to bend. See there's a big range in the numbers for different grades: https://www.spe...
by Punx0r
Feb 05 2020 8:38am
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

I know the difference, I was just puzzled by your use of phrase "any belt changes" would be covered under warranty. Why does nobody barrack ICEs for the common and extremely expensive out-of-warranty repairs commonly experienced, such as dual mass flywheels, high pressure diesel direction-injection ...
by Punx0r
Feb 05 2020 5:30am
Forum: E-Bike Technical
Topic: How do I step voltage down with low losses, weight and size?
Replies: 43
Views: 2152

Re: How do I step voltage down with low losses, weight and size?

Whether you are using a full wave bridge or half wave rectifier, the peak voltage will be the same. A capacitor across the output will charge to the same level when there is no load. The power delivered will be half, but not the peak voltage. Apologies, you are right: I was looking at the *average*...
by Punx0r
Feb 05 2020 3:25am
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10101

Re: Motortrend article with tons of info about Tesla’s Cybertruck

Hillhater wrote:
Feb 04 2020 7:02pm
Any ICE belt changes, oil leaks, gasket failures, etc etc, would be covered under the warranty or the “sale of good act”.
I'd love to hear about your experiences claiming for timing belt service changes under warranty???