Search found 13677 matches

by John in CR
Dec 14, 2017 12:01 am
Forum: Motor Technology
Topic: Duyunov wheel-hub motor
Replies: 6
Views: 225

Re: Duyunov wheel-hub motor

I am interest in becoming a distributor for Central America. I want purchase some of your motor wheels for testing before prepaying a bulk order. We now use hubmotors with 93%-95% peak efficiency, but they became to expensive to produce. If your motor design is as good or better, my associate and I ...
by John in CR
Dec 13, 2017 11:03 pm
Forum: Items for Sale - New
Topic: Carbon frame and fork for Bafang Max Drive System
Replies: 4
Views: 401

Re: Carbon frame and fork for Bafang Max Drive System

crossbreak wrote:
Dec 10, 2017 12:52 pm
price?
As I was starting to get pissed off for wasting my time with no price, I found it in the second post. $545 frame and add $125 if you want the carbon fork.
by John in CR
Dec 11, 2017 10:47 pm
Forum: E-Bike General Discussion
Topic: Electric Cargo-bike POWER system for steep terrain?
Replies: 38
Views: 1521

Re: Electric Cargo-bike POWER system for steep terrain?

My suggestion would be to run a 1000W hubmotor as a mid-drive, but not StokeMonkey style. Instead run a belt-drive direct to the rear wheel with the appropriate reduction. That is because for every uphill there is the same downhill on any round trip, and regen is important for minimum maintenance an...
by John in CR
Dec 10, 2017 7:17 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Dashboard suggestions
Replies: 7
Views: 127

Re: Dashboard suggestions

Unless you're going to have advanced BMS info displayed I like the original...nice and simple, especially for a dirtbike. Why introduce lots more points of failure with no real benefit?
by John in CR
Dec 08, 2017 3:13 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 13kw mobility scooter
Replies: 1
Views: 143

Re: 13kw mobility scooter

May all of his roads be flat and straight. I may ride some crazy stuff with similar performance and more, but someone would have to pay me to ride that thing. With those tiny wheels on front, how can the steering not be tremendously sensitive? It's nothing like having the width or low CG of a go-kart.
by John in CR
Dec 05, 2017 5:00 am
Forum: Motor Technology
Topic: cheap -high power motor combination
Replies: 3
Views: 262

Re: cheap -high power motor combination

19kw input would burn up both the motor and controller you listed in short order. FWIW, Kelly lists what they call "motor current", which is phase current. A common mistake on the forum is to multiply phase current times voltage to come up with power in watts, which isn't a valid number. To make mat...
by John in CR
Dec 05, 2017 4:18 am
Forum: Motor Technology
Topic: Idiots guide to water cooled mid motor making
Replies: 52
Views: 2462

Re: Idiots guide to water cooled mid motor making

#35 Chain??? Since you're going to all the trouble of building a motor from scratch, the least I can do is offer a couple of slices of the aluminum pulley stock at cost that I've been hording for a few years. Let me know what kind of gear reduction you want, and I'll see if I have the right combinat...
by John in CR
Dec 03, 2017 8:59 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Mid-Drive Build - comments and recommendations welcome
Replies: 30
Views: 1143

Re: Mid-Drive Build - comments and recommendations welcome

Hubmotors rule for commuters. The prime requirement for commuting is reliability, and I demand absolute reliability from my bikes, and a mid-drive can't do that. What is your recommendation? I stick to extreme performance ebikes where pedals are pretty much just a place to put your feet. That's bec...
by John in CR
Nov 30, 2017 10:16 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Mid-Drive Build - comments and recommendations welcome
Replies: 30
Views: 1143

Re: Mid-Drive Build - comments and recommendations welcome

Hubmotors rule for commuters. Weight balance only matters if you plan to go airborne or when you carry it, otherwise a rear hubbie can feel as light and nimble as a pedal bike. To me the prime requirement for commuting is reliability, and I demand absolute reliability from my bikes, and a mid-drive ...
by John in CR
Nov 30, 2017 9:57 pm
Forum: E-Bike General Discussion
Topic: The 10.000W target!
Replies: 62
Views: 2858

Re: The 10.000W target!

I think PAS would be the only way to provide meaningful human effort with a high power setup. The OP said he likes having the high power for short bursts of showing off, and then he settles into his long commute with plenty of pedal power the whole way.
by John in CR
Nov 30, 2017 2:58 am
Forum: E-Bike General Discussion
Topic: Giant pot hole makes me crash
Replies: 48
Views: 1925

Re: Giant pot hole makes me crash

...in every case, it was MY OWN DAMN FAULT!!! Including every instance of being hit by OTHER vehicles... ...Jus an old man on a bicycle? Awe come on,... e-bikes make ya feel like a kid again, and I luv it!!! Jus FAR more cautious than I used to be,... not slower. Exactly my sentiments. I have, and ...
by John in CR
Nov 29, 2017 6:42 pm
Forum: E-Bike General Discussion
Topic: The 10.000W target!
Replies: 62
Views: 2858

Re: The 10.000W target!

markz wrote:
Nov 28, 2017 11:51 pm
For some reason I always thought when I read John CR's post and the speeds, that you were riding a scooter or dedicated motorcycle looking bicycle, that's all the rage these days. Beefed up cargo would be a sight to see doing 70+kph.
Blue plus 30kg of dogfood sml.JPG
Blue plus 30kg of dogfood sml.JPG (41.24 KiB) Viewed 202 times
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by John in CR
Nov 28, 2017 11:28 pm
Forum: E-Bike General Discussion
Topic: The 10.000W target!
Replies: 62
Views: 2858

Re: The 10.000W target!

Limpsilver, I scanned thru the thread and didn't see if the frame is aluminum or steel. If aluminum then I personally wouldn't ride it, but would have no problem if it's steel. My 9 year old steel cargo bike is a hardtail, goes right at 100kph with a fresh charge. I did reinforce at the dropouts, bu...
by John in CR
Nov 27, 2017 6:34 pm
Forum: E-Vehicles General Discussion
Topic: looking for ideal base for electric car conversion
Replies: 30
Views: 879

Re: looking for ideal base for electric car conversion

My buddy has 4 Haflinger's in various stages of completion. I've finally convinced him that it's the perfect electric conversion candidate, which we'll do this dry season Quite light- just over 600kg stock Low power- 25-30hp ICE engines depending on the year. A pair of my HubMonsters should fit the ...
by John in CR
Nov 27, 2017 12:08 am
Forum: E-Bike Technical
Topic: DC to DC step down and on and off switch
Replies: 4
Views: 221

Re: DC to DC step down and on and off switch

I get the high voltage to my DC/DC converters from my keyswitch that also powers up the controllers. Then I have a switch on the 12V output from the converter to turn lights on and off. If my bike is on, then my converter is on and providing power for brake lights even if head lights and running lig...
by John in CR
Nov 25, 2017 2:37 am
Forum: E-Bike Non-hub Motor Drives
Topic: South America mid drive e-moto
Replies: 10
Views: 563

Re: South America mid drive e-moto

Good work with a quite functional result. It always cracks me up to see that little motor called a "big block" motor, so I had to post a comment. You did a good job getting the most out of it, regardless of how funny I find its name.
by John in CR
Nov 25, 2017 2:23 am
Forum: E-Bike General Discussion
Topic: ☠ Heat Damage to Motors (Magnets) ☠
Replies: 21
Views: 612

Re: ☠ Heat Damage to Motors (Magnets) ☠

There's a wide variation in magnet quality. Use cheap crap moderate efficiency motors and you get what you paid for, even if the price wasn't low. ie Follow the crowd and that's what you get, whether it's pushing current too high with heat growing by the square of current, or buying the same generic...
by John in CR
Nov 25, 2017 1:48 am
Forum: E-Bike Photos & Video
Topic: Stealth FUTR owners builds and pics
Replies: 1896
Views: 55815

Re: Stealth FUTR owners builds and pics

Had you said $15 plus shipping I wouldn't have had an issue. It does look like a standard cheapie moto keyswitch, so buying locally is the way to go. Sorry that I just have a real problem with way overpriced electric stuff. Ebikes are the most efficient form of personal transport as long as greed do...
by John in CR
Nov 24, 2017 10:37 am
Forum: E-Bike Photos & Video
Topic: Stealth FUTR owners builds and pics
Replies: 1896
Views: 55815

Re: Stealth FUTR owners builds and pics

...they said replacement keys would be 55usd to have another ignition switch... :shock: $55 for a replacement switch that from Alex's pic certainly looks like a common generic motorcycle keyswitch that I get for $5-6 . Did they slip a digit or something? I thought only the big bicycle and car manuf...
by John in CR
Nov 24, 2017 10:24 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Rubber cushion drive in rear motorcycle wheel
Replies: 9
Views: 237

Re: Rubber cushion drive in rear motorcycle wheel

If this will be powered by your MidMonster, then the 2 speed solves all the dual use (big road top speed and quite slow steep climbs with a big load) worries I had in terms of gearing. Just be sure the low gear goes fast enough for your most used riding within a few klicks of the house, and high gea...
by John in CR
Nov 24, 2017 10:00 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Add rear hub motor to front wheel?
Replies: 6
Views: 172

Re: Add rear hub motor to front wheel?

Unless you plan to power it for 2wd, there is no meaningful upside to going to the trouble of adding a front motor. Generating net power to store or use certainly isn't possible.
by John in CR
Nov 22, 2017 10:45 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Add rear hub motor to front wheel?
Replies: 6
Views: 172

Re: Add rear hub motor to front wheel?

For s similar installation, I made L shaped clamping dropouts cut from 3/8ths stock. The horizontal part clamped to the motor axle. I welded the longish vertical part of the L's to 2 pieces of tubing that were sliced open lengthwise. The tubing slid over the lower end of a motorcycle fork, and I fas...
by John in CR
Nov 22, 2017 12:12 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: My Electric Motorbike
Replies: 16
Views: 1094

Re: My Electric Motorbike

High performance and lead simply don't belong in the same sentence. Regarding some low power craptastic lithium scooter pack, I wouldn't waste my time. I use automotive grade cells to build my packs, so I get safety, high power, long life, and low price all in one package. In the long run the lithiu...
by John in CR
Nov 20, 2017 9:26 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: My Electric Motorbike
Replies: 16
Views: 1094

Re: My Electric Motorbike

Once you go lithium, you'd never even consider going back to lead batts.
by John in CR
Nov 20, 2017 9:22 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Rubber cushion drive in rear motorcycle wheel
Replies: 9
Views: 237

Re: Rubber cushion drive in rear motorcycle wheel

If you have a choice, keep it to reduce shock in the drive system when you activate regen.