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by spinningmagnets
Jan 21 2021 3:35pm
Forum: E-Vehicles General Discussion
Topic: Mid drive on a three speed
Replies: 3
Views: 60

Re: Mid drive on a three speed

The most common 3-speed's are the Sturmey Archer, and the Simano Nexus. Both have a similar construction. 2nd gear is by far the strongest gear if you want to enjoy hard starts. For hill climbing, the best bang per buck is switching to a smaller chainring. Test ride the stock chainring in your top g...
by spinningmagnets
Jan 15 2021 8:54pm
Forum: Forum Rules and Features
Topic: If you had the chance to start endless sphere all over again, what would you change?
Replies: 47
Views: 1278

Re: If you had the chance to start endless sphere all over again, what would you change?

On the moderating pages, I would like the buttons to be MUCH larger and farther apart. They are not hard to use on my laptop, but ever since we had a few shotgun-spam attacks, I like to keep up to date with spam on my smart-phone every so often. On the small screen of my average sized smart-phone, m...
by spinningmagnets
Jan 14 2021 1:47pm
Forum: E-Bike General Discussion
Topic: Aerodynamics
Replies: 307
Views: 42314

Re: Aerodynamics

Mythbusters had an episode years ago (Bubble Motorcycle) about taking a motorcycle and adding a full body fairing to actually see how much of an improvement in fuel consumption there would be. 250cc enduro style, single-cylinder. Fuel mileage went from 56 to 70 miles per gallon. An extra 14 MPG from...
by spinningmagnets
Jan 13 2021 3:00pm
Forum: E-Bike Technical
Topic: Target wattage from a motor?
Replies: 3
Views: 139

Re: Target wattage from a motor?

It all depends on the loads you apply, and how much heat results. If you are heavy, and live at the top of a hill, you need a powerful system to avoid overheating. If you live on flat land and are a light person, you can get adequate performance from an affordable and modest system. Motors only draw...
by spinningmagnets
Jan 13 2021 12:30pm
Forum: E-Bike General Discussion
Topic: Sur Ron and Larger Riders
Replies: 11
Views: 232

Re: Sur Ron and Larger Riders

I expect Sur-Rons to hold their value for the near future, due to a lack of comparable competition. Athough the market for them is small, the fan base is enthusisatic. They are currently in demand and are being sold as soon as available. If you can get one, this is when you could resell it and come ...
by spinningmagnets
Jan 12 2021 11:01am
Forum: E-Bike General Discussion
Topic: Disconnect motor phases at high speeds
Replies: 12
Views: 258

Re: Disconnect motor phases at high speeds

There have been several 2WD builds featured. They have a benefit in snow and sand, along with any other slippery condition. However, if you never ride in slippery conditions, it's cheaper and easier to simply use a more powerful motor, controller, and battery... One 2WD build definitely had a cutoff...
by spinningmagnets
Jan 12 2021 10:59am
Forum: E-Bike General Discussion
Topic: Disconnect motor phases at high speeds
Replies: 12
Views: 258

Re: Disconnect motor phases at high speeds

There have been several 2WD builds featured. They have a benefit in snow and sand, along with any other slippery condition.

However, if you never ride in slippery conditions, it's cheaper and easier to simply use a more powerful motor, controller, and battery...
by spinningmagnets
Jan 11 2021 3:52pm
Forum: E-Vehicles General Discussion
Topic: Series Hybrid Drive - into a commuter velomobile?
Replies: 23
Views: 511

Re: Series Hybrid Drive - into a commuter velomobile?

When the proposed system has no components specified, it's easy for proponents to praise a system where the ideal motor does not exist. Its also easy for detractors to insult the concept without any evidence. I like a plug-in series hybrid for certain applications. A running velomobile would be inte...
by spinningmagnets
Jan 11 2021 7:20am
Forum: General Discussion
Topic: Is this the same KnightMB that sold us out?
Replies: 188
Views: 32477

Re: Is this the same KnightMB that sold us out?

Thanks for clearing that up.
by spinningmagnets
Dec 30 2020 4:49pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1221
Views: 182221

Re: kWeld - "Next level" DIY battery spot welder

The 0.10mm thick copper may sound thin, but since copper is four times more conductive, with 1/4th the resistance (compared to nickel), the 0.10mm copper is equal in current-carrying ability to 0.40mm thick nickel.

It's also cheaper and more readily available locally than nickel, plus easier to cut.
by spinningmagnets
Dec 27 2020 9:56am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

Manufacturer ratings are often "fuzzy", but it is extremely valuable to list the type, because you found a combination that works. As you mentioned, this one is rated for 740 Cold Cranking Amps / CCA. If it actually puts out only 700A, it is of no concern, because this model works for this...
by spinningmagnets
Dec 26 2020 5:31pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

serious_sam whats the brand of polyurethane adhesive? I have heard that "Liquid Nails" construction adhesive has specific properties that work well for certain applications. It "fills" gaps to a certain extent (unlike Cyano-Acrylate "CA" glue), and after curing, it has ...
by spinningmagnets
Dec 24 2020 8:49am
Forum: Alternative Energy
Topic: solar water distillation
Replies: 31
Views: 603

Re: solar water distillation

As long as you are eating food, you can drink distilled water with no mineral-leeching effects to your body or health. We could construct a scenario where you are adrift at sea in a lifeboat, but you have a solar distiller providing all the fresh water you can possibly drink. Even then it would take...
by spinningmagnets
Dec 24 2020 8:14am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

Frank, the case of an 18650 cell is nickel-plated steel.
by spinningmagnets
Dec 24 2020 8:12am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

The north American retailer for kWeld has nickle-plated copper for series strips that are corrosion-resistant. It's funny that over the years, people ordered pure nickel ribbon from China, and half the time it arrives as nickel-plated steel, making the builders angry. And now I find myself wanting a...
by spinningmagnets
Dec 24 2020 12:07am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

Thats what the builder said. Adding a cap of nickel or steel works so well, you can get acceptable results with a much lower energy setting on the welder. Personally, I would use the infinite split and also a steel cap to the "sandwich". Steel has more resistance (heat) than nickel, along ...
by spinningmagnets
Dec 23 2020 5:59pm
Forum: Battery Technology
Topic: Can you see anything wrong with this pack build?
Replies: 21
Views: 908

Re: Can you see anything wrong with this pack build?

Nice avatar, Chalo. Looks good, brother!
by spinningmagnets
Dec 23 2020 5:58pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

Its possible that most of the current is passing through the copper from one probe to the other, with almost none going through the cell-tip. Perhaps try slicing the bus down the center, so the left and tight half of the bus is not touching each other. Here is one example...some have called this an ...
by spinningmagnets
Dec 22 2020 6:01pm
Forum: Battery Technology
Topic: Can you see anything wrong with this pack build?
Replies: 21
Views: 908

Re: Can you see anything wrong with this pack build?

It is very bad form to solder onto the negative ends of the cells. The heat will damage some of the electrolyte inside. The positive ends can take quite a bit of heat, so soldering is an option with the right tools and techniques. Use a 100W iron with a fat tip to be able to provide a lot of heat (i...
by spinningmagnets
Dec 20 2020 6:36pm
Forum: Alternative Energy
Topic: solar water distillation
Replies: 31
Views: 603

Re: solar water distillation from rainwater

You don't have to boil water to vaporise it, just warming it a little will work. Of course, at some point, boiling it for sterilization is good too. Here's a good website to start with.

https://www.builditsolar.com/
by spinningmagnets
Dec 19 2020 5:39pm
Forum: E-Bike Technical
Topic: Stronger Motor Magnets
Replies: 29
Views: 570

Re: Stronger Motor Magnets

For some designs, stronger magnets can also cause stronger cogging. Everything is a trade-off, you get more of one thing, if you sacrifice some of the other thing.
by spinningmagnets
Dec 17 2020 2:15pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

This is why these pics are important, few have posted the inside of the can. Use the lowest setting that forms a solid connection, and then...whatever the inside looks like is the standard to measure by. Also, if the setting you are getting good results with makes the welder very hot, you might get ...
by spinningmagnets
Dec 17 2020 1:19pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69938

Re: Spot Welding Copper Strips to 18650 Battery Cells

That's a great result, and thanks for posting the pics here. Can I use these pics as an example? (of course, I would credit you)