Search found 6886 matches

by Chalo
Mar 25 2019 11:42am
Forum: Items for Sale - Used
Topic: $5000 OBO GreyP 12kw E-bike - Mint Condition w/ just over 200 miles
Replies: 4
Views: 527

Re: $5000 OBO GreyP 12kw E-bike - Mint Condition w/ 91 Miles

but what stands out with this bike, is the special geared crank, allows you to pedal at 43 MPH... and the bike is built to be able to pedal - get this - - EFFECTIVELY. My power calculator says you incur something like 250W of extra drag by pedaling at 43mph versus not pedaling. So sure, you can mak...
by Chalo
Mar 25 2019 11:15am
Forum: Battery Technology
Topic: Lead acid anyone?
Replies: 28
Views: 399

Re: Lead acid anyone?

I used Hawker Genesis batteries in several of my scooters and they were the best at the time. That's what I used in my first two e-bikes. [Edit: Actually, they were Hawker Odyssey.] Then I went back to regular pedal bikes for several years, because I decided that was better. I'd do it again, if lea...
by Chalo
Mar 25 2019 2:02am
Forum: E-Bike Build Threads / Photos & Video
Topic: Music Barrel
Replies: 11
Views: 200

Re: Music Barrel

I made a bass amp out of a 20 liter heavy-walled plastic pail some years ago. I made a tuned port so it would be responsive down to 41hz (the lowest note of a bass guitar). I'd need to make one tuned a little lower for the six string bass I'm working on learning to play a little. :) It's the same l...
by Chalo
Mar 24 2019 10:10pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Music Barrel
Replies: 11
Views: 200

Re: Music Barrel

I made a bass amp out of a 20 liter heavy-walled plastic pail some years ago. I made a tuned port so it would be responsive down to 41hz (the lowest note of a bass guitar). The 10" full-range boat speaker and 40W mono amplifier I used sounded so nice that later I used it as a vocal amp for my croone...
by Chalo
Mar 24 2019 9:54pm
Forum: E-Bike General Discussion
Topic: Front vs. rear hub motor
Replies: 15
Views: 1012

Re: Front vs. rear hub motor

Build a bike like you would choose a horse. We like them with a powerful hind and light front. Those that are heavy on the front, are unfit for riding. My front-heavy bike with a front hub motor can carry your rear-heavy one, but the reverse is not true. It's fit for riding and for day to day livin...
by Chalo
Mar 24 2019 9:22pm
Forum: E-Bike General Discussion
Topic: Front vs. rear hub motor
Replies: 15
Views: 1012

Re: Front vs. rear hub motor

Build a bike like you would choose a horse. We like them with a powerful hind and light front. Those that are heavy on the front, are unfit for riding. My front-heavy bike with a front hub motor can carry your rear-heavy one, but the reverse is not true. It's fit for riding and for day to day living.
by Chalo
Mar 24 2019 8:52pm
Forum: E-Bike Technical
Topic: Cooling Solutions?
Replies: 23
Views: 255

Re: Cooling Solutions?

Thermal compound does not act as a glue. It is a paste that fills-in all the tiny irregularities between the two surfaces. It is formulated to easily transfer heat between the two surfaces, but...it's pricey. So... try to attain a good fit before adding thermal compound. Not only is is expensive, b...
by Chalo
Mar 24 2019 8:47pm
Forum: Battery Technology
Topic: Lead acid anyone?
Replies: 28
Views: 399

Re: Lead acid anyone?

Archer321 wrote:
Mar 24 2019 7:33pm
I still use lead-acid in my racecar because that is the class I run in.
Ugh. What "racing" class is that?
Image
by Chalo
Mar 24 2019 3:10am
Forum: E-Bike Technical
Topic: Cooling Solutions?
Replies: 23
Views: 255

Re: Cooling Solutions?

Noticed that the motor on my e bike (mini cyclone) runs pretty hot. On the outer casing while pushing the bike hard I can get it to go as high as around 140 degrees f or about 60 degrees c (can't touch the motor for more than a few seconds). I definitely would like this temperature to go down and I...
by Chalo
Mar 24 2019 3:00am
Forum: Battery Technology
Topic: New weldless battery system crowdfunfing project
Replies: 68
Views: 1912

Re: New weldless battery system crowdfunfing project

This is why solderless packs aren't a mechanical design problem to solve as much as a materials tech challenge to select things that won't let force creep down to nothing after sitting a while. This seems to me to be a point in favor of using a high tensile strength copper alloy as both bus and lea...
by Chalo
Mar 24 2019 2:43am
Forum: E-Vehicles General Discussion
Topic: What does this charger behavior indicate?
Replies: 17
Views: 411

Re: What does this charger behavior indicate?

I built my own pack from automotive cells. There are few physical points of failure, but there is a relatively inexpensive BMS card that I didn't make. 1 in 25 fault rate for a component that's made in at least a semi-automated manner would be anomalous in my world. The thing I installed was all SMD...
by Chalo
Mar 24 2019 2:08am
Forum: Battery Technology
Topic: Lead acid anyone?
Replies: 28
Views: 399

Re: Lead acid anyone?

So I know lithium ion is the current hot stuff right now, but is anyone still running on lead-acid batteries? There have been several reported advancements that are supposed to be coming to market in the next two years. Lead/graphene-acid and bipolar lead-acid to name two. I think you'd have to be ...
by Chalo
Mar 24 2019 1:59am
Forum: E-Vehicles General Discussion
Topic: NEV/LSV in Your State?
Replies: 15
Views: 639

Re: NEV/LSV in Your State?

markz wrote:
Mar 23 2019 9:11pm
I disregard anything California states, because they are just too wacky with their laws.
https://www.narcity.com/ca/bc/vancouver ... -in-canada
by Chalo
Mar 23 2019 7:46pm
Forum: General Discussion
Topic: Credit Card Problems?
Replies: 20
Views: 1335

Re: Credit Card Problems?

Anybody who gets a credit card or bank account from a rapacious commercial bank is asking to be abused. There are credit unions everywhere; their credit and debit cards work the same as anybody's. But their fees and customer service tend to be a LOT better.
by Chalo
Mar 23 2019 1:00pm
Forum: E-Vehicles General Discussion
Topic: What does this charger behavior indicate?
Replies: 17
Views: 411

Re: What does this charger behavior indicate?

Here's an update: I probed my battery for cell voltage and found them all very close to each other. There were no apparent problems with interconnects or plugs. My charger went back to normal behavior for a while (steady red indicator with fan when charging, steady green/no fan when full/balancing)....
by Chalo
Mar 22 2019 11:01pm
Forum: Battery Technology
Topic: Scavenging one nearly new battery to make another?
Replies: 67
Views: 1020

Re: Scavenging one nearly new battery to make another?

Get 2 of these.. For <$400. (Or 3 if you really want 72v) https://hobbyking.com/en_us/turnigy-high-capacity-battery-20000mah-6s-12c-drone-lipo-pack-xt90.html Series connect ..easy. < 5kg, 48v , same capacity as your current pack , but 3kW no problem Please correct me if I'm wrong. Nominal 3.7Vpc, 6...
by Chalo
Mar 22 2019 11:49am
Forum: E-Bike General Discussion
Topic: I need a brake
Replies: 20
Views: 395

Re: I need a brake

Oh, looks like the I couldn't upload the picture directly. They are uploaded to imgur: https://imgur.com/JUWfGHz That's a band brake, which is a kind of drum brake that doesn't work very well. When I retrofitted a formerly electric bike much like yours, I mounted a BMX caliper brake underneath, on ...
by Chalo
Mar 22 2019 1:30am
Forum: E-Bike General Discussion
Topic: Pedals? Bbshd sizes ??
Replies: 6
Views: 110

Re: Pedals? Bbshd sizes ??

Cruisers usually have one-piece cranks, which require 1/2"-20 threaded pedals no matter how new or old they are.

Three-piece cranks have historically had a variety of thread sizes, but lately it's pretty much all 9/16"-20.

Two-piece cranks are a thing now, and those use 9/16"-20 pedals too.
by Chalo
Mar 22 2019 1:24am
Forum: General Discussion
Topic: How to mount full-size flag pole to standard 26" bike?
Replies: 10
Views: 192

Re: How to mount full-size flag pole to standard 26" bike?

Hello I need help on how to fabricate or buy components off the shelf at local hardware store to mount a full size 6 foot 1" diameter flag pole on my standard 26" Townie bicycle. I want to ride around with old glory flying. If you can't contrive this nonsense without outside help, you should do wha...
by Chalo
Mar 20 2019 10:55am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 10
Views: 185

Re: Hub motor cracking noise

That doesn't sound like spokes to me. Are they very loose?
by Chalo
Mar 20 2019 1:06am
Forum: E-Bike General Discussion
Topic: Middrive Chain popping
Replies: 25
Views: 369

Re: Middrive Chain popping

"Only" 2400W is only about 12 times a concerted effort by an average person at the pedals. Maybe 5 times that of an elite athlete. Such power quickly wears and elongates a chain, which in turn transfers that wear to the sprockets. Once a chain is elongated by 1% or more, it's likely to make noise, f...
by Chalo
Mar 19 2019 9:54pm
Forum: E-Bike General Discussion
Topic: BBS02 possible seal failure?
Replies: 4
Views: 98

Re: BBS02 possible seal failure?

It looks like a normal amount of weeping for a bearing with a generous grease fill.
by Chalo
Mar 19 2019 8:34pm
Forum: E-Bike General Discussion
Topic: First build, heavy rider, thinking BBSHD, seeking some advice/input
Replies: 10
Views: 272

Re: First build, heavy rider, thinking BBSHD, seeking some advice/input

In my opinion, a downhill bike (or any full suspension MTB) makes a crap commuter, because you quickly run out of places for your stuff. It's hard enough just to fit a decent battery on one of those toy bikes. If you are going to remain within the legal-ish speed range, there's no case to be made fo...
by Chalo
Mar 19 2019 4:33pm
Forum: E-Bike General Discussion
Topic: hub motors, have you broken your rim/spokes yet
Replies: 11
Views: 304

Re: hub motors, have you broken your rim/spokes yet

One of the latest buyers of our new 6-passenger e-pedicab decided to test its limits. He loaded it up with ten other pedicabbers and went hooning around making hard turns. After a few hours of doing this intermittently, it made noise indicating he'd broken spokes, and he stopped... and one of the re...