Search found 7696 matches

by Chalo
May 07 2021 1:52pm
Forum: EBike General Discussion
Topic: DIY candidates
Replies: 5
Views: 60

Re: DIY candidates

Aside from what Chalo said, where would you mount a battery on those bikes? Under the downtube? There's a limited amount of space there, or in a handlebar bag. You could mount a conventional rear rack on the red bike. The green bike can only have a seatpost rack (which doesn't support much weight) ...
by Chalo
May 07 2021 12:38pm
Forum: EBike General Discussion
Topic: DIY candidates
Replies: 5
Views: 60

Re: DIY candidates

Spend more time researching and getting your expectations better aligned with reality. 20 mph is plenty fast for a regular bicycle. 30 mph is a risky and uncomfortable speed for a regular bicycle, and to go faster you should start with a motorbike or a sophisticated and very expensive fully suspende...
by Chalo
May 07 2021 11:44am
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1667
Views: 227288

Re: 2 Speed Xiongda hubmotor

A lightweight, low power hub motor is not a good match for 29 inch wheels.
by Chalo
May 07 2021 10:24am
Forum: EBike Build Threads
Topic: Xtracycle Build Log
Replies: 67
Views: 5710

Re: Xtracycle Build Log

30% difference in efficiency between your two bikes probably indicates one of two things: either a major difference in aerodynamic qualities (mainly riding position), or a difference in average speed. I'm not entirely sure it's aero, as I tuck when I go over 25 on both vehicles. Note that moving th...
by Chalo
May 07 2021 10:19am
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 77
Views: 2630

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

Once you succeed at making e-bikes leaky and smelly, you can move on to figuring out how to make them emit toxic fumes and obnoxious noise.
by Chalo
May 07 2021 10:08am
Forum: Battery Technology
Topic: Nickel welding strips - current capability ??
Replies: 17
Views: 6980

Re: Nickel welding strips - current capability ??

My total length is 30" of nickel per layer. There is never less than 2 nickel sections per group of 5 cells. I did the math based on 100 amps draw and across both layers of 20S5P. I will see 19.8 watts of heat in the nickel. That's hardly worth mentioning really. The nickel strip is one thing;...
by Chalo
May 07 2021 9:50am
Forum: EBike Build Threads
Topic: Xtracycle Build Log
Replies: 67
Views: 5710

Re: Xtracycle Build Log

I notice significantly higher spinning resistance (push wheel with a finger and see how long it takes to stop) than my RBF Cruiser as well... what causes might this point to? Too-tight axle bearings, or a dragging brake pad. In neither case would it make a difference in Wh/mi efficiency, but in bot...
by Chalo
May 06 2021 2:54pm
Forum: Battery Technology
Topic: Ebike Battery stored for a long tome
Replies: 16
Views: 345

Re: Ebike Battery stored for a long tome

I can't help but ask about these revival methods I've seen on YouTube where folks open them, fill the cells with distilled water, and then trickle charge them with constant current/low amperage chargers. Does that actually work? I've never tried it. Most bike SLAs are absorbed glass mat type cells,...
by Chalo
May 06 2021 1:31pm
Forum: EBike Technical
Topic: Do some motors have more/less torque with the same power levels?
Replies: 24
Views: 564

Re: Do some motors have more/less torque with the same power levels?

RTLSHIP wrote:
May 04 2021 12:33pm
A smaller wheel diameter should give you more torque
No. Torque is independent of wheel diameter. What you're talking about is mechanical advantage, tractive effort, "thrust"-- but definitely not torque.
by Chalo
May 06 2021 1:26pm
Forum: E-Vehicles General Discussion
Topic: Circumference and speed ?
Replies: 5
Views: 106

Re: Circumference and speed ?

Convert the tire circumference difference into a percentage, and that percentage will also be the change in speed, with RPM's being the same. A smaller diameter wheel will usually be able to spin up to a higher percentage of its free speed. So the difference in top speed is likely to be a little bi...
by Chalo
May 06 2021 1:04pm
Forum: EBike Troubleshooting
Topic: My hubmotor studders when starting.
Replies: 3
Views: 102

Re: My hubmotor studders when starting.

If your motor plugs into the controller with 8 wires (3 large, 5 small), then chances are you have a broken or iffy connection on one of the small wires. You paid your money and you took your chances. Certainly you weren't spending enough to get anything but bottom shelf goods (which might turn out ...
by Chalo
May 06 2021 12:46pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Left drive freewheel sprocket
Replies: 1
Views: 59

Re: Left drive freewheel sprocket

Is there a UK supplier which sells a left drive freewheel 16T or 18T sprocket for either #410 or #420 chain, to fit a motor (MY1018) with shaft size 11mm. Information about an overseas supplier would also be welcome. Ken Get a regular left hand threaded freewheel and mount it on a 1.37" x 24 t...
by Chalo
May 06 2021 11:54am
Forum: Battery Technology
Topic: Ebike Battery stored for a long tome
Replies: 16
Views: 345

Re: Ebike Battery stored for a long tome

I don't want to commandeer the thread but I have a similar situation and a similar question. I also bought an ebike from someone who claims it had not been used for years, but the difference between the OP's situation and mine is, the 24 volt battery is compromised of two 12 volt 10amh SLA batterie...
by Chalo
May 05 2021 7:34pm
Forum: EScooters/EMotorcycles
Topic: special pleading
Replies: 68
Views: 1729

Re: special pleading

Electrical regenerative braking is the wrong kind of braking for mobility scooters and powerchairs. The most important braking for those machines is for getting a hard, precisely located full stop, and firm positioning to keep the scooter from moving when it's stopped or parked. E-braking is bad at ...
by Chalo
May 05 2021 11:27am
Forum: EBike Troubleshooting
Topic: Wilderness energy motor has additional drag.
Replies: 3
Views: 92

Re: Wilderness energy motor has additional drag.

Any suggestions on bearing? The bearings usually come out from the inside of the hub side covers. If there's a lot of rust, you might have an adventure getting the side covers off. The seals of the bearings will say what size they are, e.g. "6904" or "6002". Go to VXB or The Big...
by Chalo
May 05 2021 10:28am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 739

Re: Welding down a torque arm

-Regen adds range, it's like getting 5% or more of free battery. Using 5% or more additional battery is cheaper and easier for most folks than making and installing clamping dropouts. It's much less likely to end your ride, your bike, and/or your face than using regen braking without clamping dropo...
by Chalo
May 05 2021 10:22am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 739

Re: Welding down a torque arm

The forks are strong. They are Chromoly. The tips are solid 5 mm or 1/4" as you can see. No squashed tips. Well, either they're smashed into shape from the tube ends (like an old Huffy), or they're styled to look as if they were. I have never seen a chromoly fork with that treatment, but in pr...
by Chalo
May 05 2021 12:58am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 739

Re: Welding down a torque arm

Here are a few more pics. Dude. Those forks are janky AF. Would you use them as a wrench? No you would not. That makes them unsuitable for restraining axle torque. In the USA, squashed-tube fork tips like that are common only on department store bikes from the 20th century. Is that what you're using?
by Chalo
May 05 2021 12:51am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 36
Views: 698

Re: E-bike mid-drive motors hardly outperforms hub motors

With which he doesn't disagree - hub drive sacrifices performance. Everyone understands that, and why it is. But how much? Apparently not very much. Maybe it would be clearer if the graphs were superimposed? Maybe his analysis is bogus? In my observation, 2/3 as much peak power resulted in indisput...
by Chalo
May 04 2021 12:05pm
Forum: E-Vehicles General Discussion
Topic: Aptera is gone for good. :'(
Replies: 114
Views: 13113

Re: Aptera is gone for good. :'(

Found this from a local TV station today:
by Chalo
May 04 2021 11:59am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 36
Views: 698

Re: E-bike mid-drive motors hardly outperforms hub motors

I wrote an article where you can read that a mid-drive motor hardly outperforms a hub motor. Meanwhile, back in the real world, some of us have had both. I've had both. My current hub motor bikes both peak near 1900W (electrical) on a freshly topped up battery. My former mid drive bike peaked at ab...
by Chalo
May 04 2021 11:38am
Forum: EBike General Discussion
Topic: Looking for a 20" foldable fat tire bike that is not an ebike
Replies: 4
Views: 83

Re: Looking for a 20" foldable fat tire bike that is not an ebike

I really, really doubt it. Everything about those bikes makes them unpleasant and extremely slow to pedal. When folded, they're several times as bulky as a real folding bike. A pedal-only version of such a thing would have at best a very limited market (of self-pwning dudes). Only adding a motor mak...
by Chalo
May 04 2021 1:31am
Forum: EBike Build Threads
Topic: Xtracycle Build Log
Replies: 67
Views: 5710

Re: Xtracycle Build Log

The throttle I bought has issues, namely a very narrow range of input. I'm either too slow or full bore. Hard to get any throttle values in between. Are you using the Wuxing 130X throttle? https://img.alicdn.com/imgextra/i1/6000000001182/O1CN010kyoAC1KbOdzFPDPa_!!6000000001182-0-tbvideo.jpg If so, ...
by Chalo
May 04 2021 1:07am
Forum: Battery Technology
Topic: Ebike Battery stored for a long tome
Replies: 16
Views: 345

Re: Ebike Battery stored for a long tome

Some of the old Giant bikes used 24v (about 29v full) NiCd or NiMH batteries, which don't typically have a BMS. That's a good point. I associate this chemistry only with LaFree bikes made by Giant, but surely there were others. If you open the pack and find the cells are in a series of 20 or 21 gro...
by Chalo
May 03 2021 10:32pm
Forum: Battery Technology
Topic: Ebike Battery stored for a long tome
Replies: 16
Views: 345

Re: Ebike Battery stored for a long tome

The best way to check the health of the battery is to charge it up, open it, and check the voltage of each individual cell group. Then run it down somewhat, and check the cell group voltages again. If they're pretty much the same overall, that's good. If there's one or more group that has different ...