Search found 6500 matches

by Chalo
Dec 09 2018 5:48pm
Forum: E-Bike Non-hub Motor Drives
Topic: quick bbs02v2 question: 16 awg power wires ?
Replies: 1
Views: 23

Re: quick bbs02v2 question: 16 awg power wires ?

Resistance is a function of wire cross-section and length. I don't think very much heat will be generated (or energy lost) in the short piece of 16ga wire. Consider that the power traces and FET legs on our controller and BMS circuit boards are much smaller yet. They don't incur much loss because th...
by Chalo
Dec 09 2018 5:37pm
Forum: E-Bike General Discussion
Topic: Purpose of the white stripe on Schwalbe tires?
Replies: 2
Views: 29

Re: Purpose of the white stripe on Schwalbe tires?

Grautuefel wrote:
Dec 09 2018 5:23pm
They're retrorefletive. Make you easier to see at night
The one in the picture doesn't look like a reflective stripe. It's partway into the knobby tread. My guess is that it's only a cosmetic feature.
by Chalo
Dec 09 2018 12:43pm
Forum: E-Bike Non-hub Motor Drives
Topic: new cyclone 3000 w mid-drive kit?
Replies: 3083
Views: 293961

Re: new cyclone 3000 w mid-drive kit?

What was the nature of the damage? Normal wear, bent teeth impinging on its neighbors, or something else?

I got a 14t outer position sprocket for my BBS02 bike. I would use a bigger outer sprocket if I could get my hands on one, because 46/14 is too high a ratio to be of use to me.
by Chalo
Dec 08 2018 10:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: new cyclone 3000 w mid-drive kit?
Replies: 3083
Views: 293961

Re: new cyclone 3000 w mid-drive kit?

So after finally getting a replacement half link chain here in the netherlands, where nobody sells them, I've put my motor kit back together and it's still slipping under even light acceleration. If your old chain was worn and elongated, then the chain in turn wore out your sprockets. Worn sprocket...
by Chalo
Dec 07 2018 3:37am
Forum: Battery Technology
Topic: Replace Cells?
Replies: 16
Views: 295

Re: Replace Cells?

If they are low due to being drained by the damaged BMS, then you can simply leave the pack on the charger continuously for a few days (or more likely a few weeks), and the BMS will rebalance the pack. In the past, I was led to believe that BMS often run their continuous processes from the power of...
by Chalo
Dec 07 2018 3:15am
Forum: General Discussion
Topic: Volkswagen says last generation of combustion engines to be launched in 2026
Replies: 21
Views: 382

Re: Volkswagen says last generation of combustion engines to be launched in 2026

Once again, energy density for a given c-rate has improved. Prices have fallen by an order of magnitude in 10 years! Ten times! 1000%! I'm baffled how you find this "very little". I remember declaring some time ago that I'd buy into lithium batteries when I could get a usable 1 Wh per $1. Well, I w...
by Chalo
Dec 06 2018 10:53am
Forum: E-Bike Technical
Topic: Can a 1000W hub motor damage a steel frame if ridden harshly (not powerfully)
Replies: 10
Views: 314

Re: Can a 1000W hub motor damage a steel frame if ridden harshly (not powerfully)

neptronix wrote:
Dec 04 2018 1:16pm
Water hose clamps are not good at handling torque at all.
While that's true as a rule of thumb, torque is a force times a radius. If you increase the radius, you don't need as much force to have the same torque.

Image
by Chalo
Dec 06 2018 2:23am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 2916
Views: 99038

Re: Wind and Solar vs Coal, Gasoline, Nuclear

But, on the subject of PV generation, consider the well known fact that it is barely useful without some form of storage, ??? Is the word "fact" pronounced "bullshit" in your country? Where I live, the heaviest power loads occur during the brightest part of the day, when air conditioning is being u...
by Chalo
Dec 05 2018 2:13pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 2916
Views: 99038

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Management fails; maintenance is neglected; security becomes rote. Systems that depend upon active vigilance will always collapse from time to time. That's true of every source of power out there. There are no lasting consequences of an accident in renewable power. The risks you've identified belon...
by Chalo
Dec 05 2018 2:04pm
Forum: Battery Technology
Topic: How to mix different internal resistances?
Replies: 22
Views: 393

Re: How to mix different internal resistances?

Why would it? The voltage being constrained to the same value, the string with less resistance will discharge more current under load, and then absorb some charge from the other strings when no longer under load. Parallel strings can't become imbalanced; only cells or groups in series can do that. ...
by Chalo
Dec 05 2018 12:17pm
Forum: Battery Technology
Topic: How to mix different internal resistances?
Replies: 22
Views: 393

Re: How to mix different internal resistances?

I think he means if you have assembly parallel groups of differing total IR and then put them in series. Yeah-- you don't want that. It seems to me that if you are intentionally mixing cells of different IR, you might be best served by a pack design that would otherwise be a bad idea: Build 1P stri...
by Chalo
Dec 05 2018 10:45am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 2916
Views: 99038

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Is widespread persistent radioisotope contamination a mental issue or a technical one? Because I don't see either improved attitude or technological wizardry making much difference in Chernobyl or Fukushima or Hanford. Maybe those facilities should have been trusted to Australian local utility oper...
by Chalo
Dec 05 2018 2:11am
Forum: E-Bike Technical
Topic: Two "handle bar" positions
Replies: 18
Views: 316

Re: Two "handle bar" positions

Hobbyist 3D printing isn't suitable for bicycle structural components. It's as if you're making seat mounts from wood, or yarn, or Lego, or bread dough, just because you're familiar with the process.

In the real world, such things are welded, machined from solid metal, or forged.
by Chalo
Dec 05 2018 1:46am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 2916
Views: 99038

Re: Wind and Solar vs Coal, Gasoline, Nuclear

I can easily see localised "Nuclear" generation units ..even as local as individual industry plants. All we have to do is get over a few mental and technical issues That would be great. Unfortunately we have been saying that for 64 years. And the history of small nuclear power plants is . . . not a...
by Chalo
Dec 04 2018 2:59pm
Forum: Battery Technology
Topic: How to mix different internal resistances?
Replies: 22
Views: 393

Re: How to mix different internal resistances?

I know that it wouldn't be smart making a one parallel group of IR 18, one parallel group of IR 25 because it will lose balance really fast. Why would it? The voltage being constrained to the same value, the string with less resistance will discharge more current under load, and then absorb some ch...
by Chalo
Dec 04 2018 11:30am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 2916
Views: 99038

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Industry will always use horses! Mark my words. Renewable energy is there for the taking. It's a matter of willingness and commitment to do what it we must do to use it. And to one degree or another, it's also a matter of consuming energy like it's expensive instead of consuming it like it's free. A...
by Chalo
Dec 02 2018 3:05am
Forum: General Discussion
Topic: Loose crank bearings? [Cyclone3000]
Replies: 2
Views: 97

Re: Loose crank bearings? [Cyclone3000]

Freewheeled cranks that use modified rear single freewheels as a mechanism have a fatal flaw. The bearing is not designed or intended to rotate when there's tension on the chain. It quickly craps out if it is used with motor power without pedaling along. Often, this manifests as the side cover/adjus...
by Chalo
Dec 02 2018 2:54am
Forum: E-Bike General Discussion
Topic: New Development of Airless Tires
Replies: 3
Views: 180

Re: New Development of Airless Tires

One of the most important jobs a pneumatic tire does is to distribute dynamic stress around the entire wheel, rather than just the area over the tire's contact patch. No foam tire can do this.

The kind of foam isn't the problem.
by Chalo
Dec 01 2018 1:53pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Top Speed on Chinese kickboard?
Replies: 9
Views: 254

Re: Top Speed on Chinese kickboard?

I would still think dual motors drawing 70 amps total from the battery should be able to attain something even remotely close to the advertised speeds; 60V times 70A is about 4200W of electrical power. At 80% efficiency, that's about 3300W mechanical under near-ideal conditions. For an average size...
by Chalo
Dec 01 2018 5:12am
Forum: Motor Technology
Topic: 4x less coasting resistance
Replies: 21
Views: 721

Re: 4x less coasting resistance

Changing the shape of the stator is one way to do it. Going with razor thin laminations is another. Combine both and you have a DD motor that spins like a freewheel in it and achieves 90-95% peak efficiency.. Too bad mainstream motor makers aren't so interested in these things.. I doubt it's as eas...
by Chalo
Nov 30 2018 9:22pm
Forum: E-Bike General Discussion
Topic: Lots of punctures - replace with solid or puncture resistant
Replies: 35
Views: 1543

Re: Lots of punctures - replace with solid or puncture resistant

Could it be possible that this clumping occurs because the tube has a powder substance inside of it? It happens just as readily to tubeless tires that have no powder in them. It's only a matter of the latex coagulating. Glycol-based sealants like Slime can do an analogous trick, because they use fi...
by Chalo
Nov 30 2018 9:13pm
Forum: E-Bike General Discussion
Topic: Lots of punctures - replace with solid or puncture resistant
Replies: 35
Views: 1543

Re: Lots of punctures - replace with solid or puncture resistant

Okay, as for the tire in a tire idea.. Seems like it would have some other problems.. 1) Cut the tire in half, and now you have a gap in the tire, which could shift around and create a bump in your tire.. 2) Don't cut the tire in half, and at low pressure, the inner tire can still shift around.. Do...
by Chalo
Nov 30 2018 12:08am
Forum: General Discussion
Topic: Is there an easy way to kill the Tapatalk popup?
Replies: 0
Views: 107

Is there an easy way to kill the Tapatalk popup?

Lately the Tapatalk app popup has been pestersome to an unreasonable degree. If a real person refused to acknowledge the answer "no" that many times in a row, you could have him arrested.

What can I do, other than rooting my fone, to make this nonsense stop?
by Chalo
Nov 29 2018 10:56pm
Forum: E-Bike General Discussion
Topic: Lots of punctures - replace with solid or puncture resistant
Replies: 35
Views: 1543

Re: Lots of punctures - replace with solid or puncture resistant

I went with regular 2.125 tires and STANS in the tubes and couldn't be happier. I hope the flats are minimized with the STANS in there but we'll see. Stan's and other latex-based sealants turn into cottage cheese monsters over a relatively short period of time. Those monsters don't have much value ...
by Chalo
Nov 29 2018 2:12pm
Forum: E-Bike Non-hub Motor Drives
Topic: Calling all Belt Drive Experts
Replies: 25
Views: 878

Re: Calling all Belt Drive Experts

"Crazy high tension" by chain drive standards is just part of the deal with belts. The design has to tolerate those forces. Ideally, you support any shaft that has a belt sprocket on it with bearings on both sides of the sprocket. This isn't always practicable, and it always makes replacing the belt...