Endless Sphere

It helps to have a moped rim, because the spoke holes are angled. I have read about a surprising amount of success with one-cross spoke pattern using 12ga and 14ga spokes. The thicker 10ga do not have any stretch or flex in them, and they break more than I would have guessed. Also, rear suspension i...

In the DIY home power-wall community, there is a growing use of thermal cameras to identify a hot cell, long before a fuse might blow from an internal short.

Of course the most affordable thermal cameras are not as precise, and have a coarse resolution, but...they appear to be "good enough".

Once you have a large transformer, you can even put a few turns of smaller wire through the secondary window, and leave some airspace. It is good to tie-wrap the secondary or it will vibrate a lot, but as long as it doesn't vibrate through the wire insulation, it will still be fine. You can lower th...

These last two years have seen historic lows in the prices of fuel, and the 737 and also the 737max were both developed during a time when there was a fear of near-future fuel prices climbing. There is a constant drive for higher efficiencies, and when more efficient engines are made, there is a des...

The total watts are determined by the copper mass passing through the transformer windows. Once they are as filled as possible, you can divide that copper mass into a few turns of fat wire (low volts/high amps)...or...more turns of smaller wire (higher volts/lower amps) https://www.electricbike.com/...

The total watts are determined by the copper mass passing through the transformer windows. Once they are as filled as possible, you can divide that copper mass into a few tons of fat wire (low volts/high amps)...or...many turns of smaller wire (higher volts/lower amps)

I believe Micah Toll did a youtube review. It's too small if you are above six feet. I seem to remember he said it wasn't bad for around town. I also seemed to remember there was a lead acid version, and a lithium version. Since this appears to have been built to a low price point, I am certain ther...

I was thinking about typing something that I thought would be clever and informative, but...after reading the above posts...do what Dogman says. (*also, check his post count)

Just to let you know, IF the true "fully charged" voltage of your existing battery packs is 58V, then they can be used as a back-up power source, since many inverters that convert DC batteries to 120V AC have a 60V input max. Typically the 48V labelled packs have 13 cells in series, and the 52V pack...

Add 100-psi compression on the flat sides, and also add a temp sensor to the inner cells. 140F temps or more are a no-go, warm is good, hot is bad.

Extraordinary claims require extraordinary evidence.

I looked at a teardown of this controller just now. I like the orientation of the FETs. Someone also suggested this kind of orientation on my Cheap FOCer thread. I think I might use that sort of FET layout for a 12 FET version For about a year, the Adaptto controllers were the "next big thing", and...

This looks like it will really provide some competition for the Adaptto Mini-E. Open source is good.

On the weekend of March 17, I deleted quite a few posts (on the last two pages, at the time) that were part of a discussion that devolved into an argument with a sprinkling of personal attacks. Posts that only discussed motors and electrical phenomena were left intact. Posts that were personal attac...

I don't think Tyson is a good example of a nice person, but...in his prime he was devastating. It's all armchair quarterbacking to discuss Tyson vs Ali vs Joe Louis, etc...

Some of the early car EV conversions used the stock manual transmission, and most users reported only using second gear and the top gear. Chevy is famous for their simple and robust 2-speed "Powerglide" automatic transmission. That might be an option. I agree with Luke that these are most useful in ...

I only mentioned that because when someone is building a custom E-moto, there are dozens of design issues that must be compromised and a decision made. Choosing a sprocket-rotor / sprotor can be very helpful to know about to help certain builds. Knowing about an O-ring chain might make a sprotor a v...

I think if opponents are well matched in size and weight, each would do well in their trained category. In an MMA fight, the boxer is likely to lose. In a boxing match, the MMA fighter is likely to lose...just my opinion. Boxing is scored differently than MMA, and MMA usually ends in a submission (t...

I had a friend who used an "O-ring chain" on a Honda 750 where each link had an ostensibly life-time amount of synthetic lube trapped around each chain pin. It was his only means of transportation. He never lubed it, and it lasted years. He stated that if it ever failed, he would get another of the ...

I recall seeing a device with several DC circuits that had a blown fuse alert. On the current input side, when the fuse would blow in the lower-resistance circuit, a short parallel circuit had a tiny bulb and a high-Ohm resistor. Normal current took the "path of least resistance". As long as the wor...

A thin and narrow nickel strip is perfect for the parallel connections.

Makita laser-welds nickel-plated copper to their 30Q/25R cells.

If the causal readers take anything away from this discussion, I hope it is the fact that the negative end of an 18650/21700 cell is the connection that is the most sensitive to any heat that is used in the connection process . Conquer the negative end, and the positive is easy. I haven't found any ...

An incandescent filament bulb will work. 40W is better than 100W, but either will work.

I recommend that you don't allow the pack to go below 3.3V per cell. 14S X 3.3V = 46V

What countries do you ship to? Where are these being made?

"18650 shrink and cell holders" on facebook and ebay.located in Rhode Island, USA

Beauty is in the eye of the beholder...

One man's trash, is another man's treasure.

https://www.electricbike.com/custom-builds-index/