Search found 4942 matches

by Punx0r
Mar 04 2020 5:59pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6287
Views: 346476

Re: Wind and Solar vs Coal, Gasoline, Nuclear

we do know from historical data that there’s a nearly 1:1:1 correlation between energy usage, CO2 emissions, and GDP. You must have posted that same false statement 20 times now in this thread. Is this a Trump-esque strategy? Keep repeating a lie until people conclude there must be some truth to it...
by Punx0r
Mar 04 2020 11:04am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6384

Re: Electric Racing Chainsaw Build, Help Please

speedmd wrote:
Mar 04 2020 9:13am
The Avid claims 12000 rpms on the AF125 https://avidtp.com/product/evo-motors/
Shame they don't do an AFR62.5, it'd be perfect!
by Punx0r
Mar 04 2020 8:52am
Forum: Motor Technology
Topic: What's so bad about low impedence?
Replies: 30
Views: 1807

Re: What's so bad about low impedence?

It all goes back to supply voltage. The power you can get out of a load is given by its resistance (at DC) or its impedance (at AC.) well there's the flaw in your thinking. generally power goes into a load. hard to believe you actually went to MIT. This is irrelevant semantics. A motor is a load fr...
by Punx0r
Mar 04 2020 8:30am
Forum: Battery Technology
Topic: Just found 2000 LiFePo 18650 cells in the recycler
Replies: 9
Views: 718

Re: Just found 2000 LiFePo 18650 cells in the recycler

If it won't cost you to take them back to the recycler if they turn out to be no use then you might as well take them ;) Even with diminished capacity they're potentially useful for stationary storage if you (or someone you sell them to for cheap) can be bothered to spot weld them all together.
by Punx0r
Mar 04 2020 8:23am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6384

Re: Electric Racing Chainsaw Build, Help Please

We may have a winner! https://www.autocar.co.uk/car-news/industry/uk-firm-launch-worlds-most-power-dense-ev-motor I guess the claimed weight is the rotor and the motor's part of the housing shared with the controller & diff and it'll be a year even before prototypes are made, but it's 220kW for 10kg...
by Punx0r
Mar 04 2020 4:58am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6287
Views: 346476

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Subsidies to Australian wind turbines will amount to $5.0 + MILLION EACH ! :shock: Currently , each turbine averages $525,000 in subsidies annually ! Note:- each wind turbine generates less than 8000MWh annually,..value less than $400,000 !! ..On the basis of there being 2 077 wind turbines in Aust...
by Punx0r
Mar 04 2020 4:52am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6287
Views: 346476

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Would you like to see the oldest operating wind turbine in the world? https://www.power-technology.com/features/oldest-operating-wind-turbine-tvindkraft/ It was built by a collective of citizens, lead by local school teachers who were fed up with energy shortages and high prices caused by the oil cr...
by Punx0r
Mar 04 2020 4:41am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6287
Views: 346476

Re: Wind and Solar vs Coal, Gasoline, Nuclear

The MEGA grid... It would appear that the ideal RE solution of distributed generation potentially eliminating the need for high capacity Grid infrastructure, has been rethought to the extent that infact “super” and Continent wide “Mega” Grids are necessary to enable RE to function effectively. The ...
by Punx0r
Mar 04 2020 4:34am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6287
Views: 346476

Re: Wind and Solar vs Coal, Gasoline, Nuclear

They are in your neck of the woods..(Oxford.).. You should pop round and have a chat..put them straight ! :roll: By Aussie standards they're practically my neighbours ;) My understanding is their research has been the groundwork for the larger ITER facility in France where there's the actual chance...
by Punx0r
Mar 04 2020 4:27am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6384

Re: Electric Racing Chainsaw Build, Help Please

For dickering about the world of RC motors taps out at 10-12kW (input power, shaft power will be less): *Hacker make some nice (but expensive) motors: -Their largest inrunner: https://hackermotorusa.com/product-category/hacker-brushless-motors/outrunners/hacker-q100-9500-watt-brushless-motors/ 1.8/2...
by Punx0r
Mar 04 2020 3:30am
Forum: General Discussion
Topic: Fatal ebike crash trial
Replies: 31
Views: 3111

Re: Fatal ebike crash trial

I imagine the difference would have been large: causing death by dangerously driving something defined as a motor vehicle is a well-defined offence that carries relatively stiff penalties, whereas there is often by such specific offence for bicycles and "dangerous cycling" penalties are relatively m...
by Punx0r
Mar 03 2020 9:13am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6384

Re: Electric Racing Chainsaw Build, Help Please

Incremental prototypes would be a great way to get a feel for the technology and which direction to head in. Some 12S lipo packs, a big ~5kW RC motor and a sensorless controller on a smaller saw would be an easy way to dip a toe.
by Punx0r
Mar 03 2020 9:08am
Forum: General Discussion
Topic: Trouble With the Car You're Still driving?
Replies: 64
Views: 4437

Re: Trouble With the Car You're Still driving?

Yes, fuseboxes have traditionally been (and should be) readily accessible with no tools required. Anything else is lazy design.
by Punx0r
Mar 03 2020 5:33am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6384

Re: Electric Racing Chainsaw Build, Help Please

If you think you can get away with not having to have controller and batteries mounted on the saw then it will make things much easier (if the rules get rewritten to accommodate electric saws I could see them stipulating everything has to be on the saw - no umbilicals). I'd go for a backpack rather ...
by Punx0r
Mar 03 2020 4:22am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 21
Views: 2036

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

If the new freewheel is a different model to the old one then the thread type might be different, Unfortunately freewheels can have a number of similar, but incompatible threads:

https://www.sheldonbrown.com/freewheels.html
by Punx0r
Mar 03 2020 3:52am
Forum: General Discussion
Topic: Fatal ebike crash trial
Replies: 31
Views: 3111

Re: Fatal ebike crash trial

Yes, they can. A civil suits only needs to prove liability on the balance of probability (i.e. what is most likely) rather than beyond all reasonable doubt, as in a criminal case. The higher standard of proof in a criminal case reflects that the accused's freedom is at risk, not just their money. Yo...
by Punx0r
Mar 03 2020 3:21am
Forum: General Discussion
Topic: Bitcoins
Replies: 289
Views: 52614

Re: Bitcoins

From that link: "In short, removing legal tender status means that some older bank notes will no longer have the official status of being approved for payments of debt. Essentially, that means you will no longer be able to spend that 1935 $25 bank note to buy items at a store. But these bank notes w...
by Punx0r
Mar 02 2020 5:07pm
Forum: General Discussion
Topic: Fatal ebike crash trial
Replies: 31
Views: 3111

Re: Fatal ebike crash trial

Interesting he was cleared of riding without a licence as he seemed to be bang to rights on that one, irrespective of the impact.
by Punx0r
Mar 02 2020 5:02pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6287
Views: 346476

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Obvious troll is obvious
by Punx0r
Mar 02 2020 10:40am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6384

Re: Electric Racing Chainsaw Build, Help Please

Rotors can be wrapped with carbon filament to help hold things together if things are that bad. Gearing is a contentious proposition. The "normal" problem with high-power, low weight motors is usually they spin too fast to be of practical use. Now here's an application that almost has the opposite p...
by Punx0r
Mar 02 2020 4:11am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6287
Views: 346476

Re: Wind and Solar vs Coal, Gasoline, Nuclear

You are aware that hurricanes are a phenomenon powered by heat, right?
by Punx0r
Mar 01 2020 6:43pm
Forum: General Discussion
Topic: Bitcoins
Replies: 289
Views: 52614

Re: Bitcoins

Not even directly through the national bank/ note issuer? Our countries have fairly similar institutions and in the UK you can exchange any withdrawn bank note going right back to 1694...
by Punx0r
Feb 29 2020 6:27am
Forum: E-Vehicles General Discussion
Topic: Leaving my power supply on all the time?
Replies: 4
Views: 573

Re: Leaving my power supply on all the time?

0.05A x 110V = 5.5W

A handful of watts is about right to keep an object of that size warm to the touch.
by Punx0r
Feb 29 2020 6:20am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6384

Re: Electric Racing Chainsaw Build, Help Please

Battery can be backpack mounted if needed so isn't a constraint or a technical challenge. I think it's a given the system needs to match the two smoke saw's speeds. Electric motors can be over-revved. Iron losses will either become excessive or the rotor will fly apart, but this is drag racing so su...