Search found 707 matches

by donn
May 09 2021 1:05am
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1695
Views: 227967

Re: 2 Speed Xiongda hubmotor

What are the odds that the Xiongda 2-speed is really intended for use with normal wheels, like 26" to 700C/29" ? It's a parameter I have wondered about - manufacturers are usually silent on the subject of the internal gear ratio, am I right? Reduction gear ratios are usually 1:5 or close ...
by donn
May 08 2021 9:16am
Forum: EBike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1695
Views: 227967

Re: 2 Speed Xiongda hubmotor

Though in principle, it seems that the small motors could easily be adapted to use with normal bicycle wheels, since their mechanical advantage is invariably mediated by internal gears. If we found that going on, then sure, the small wheel would still offer more torque, but at perhaps too much sacri...
by donn
May 05 2021 3:05pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 857

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

What I think is funny is that when recumbent riders start thinking about an electric drive, practically every one of them decides it's got to be a crank drive. Because of the obvious efficiency advantage - just like the obvious aerodynamic advantage that sold them on recumbents. You can't tell them ...
by donn
May 05 2021 11:12am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 857

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

As I wrote before, running 2 identical motors at identical RPM at identical road speed will give nearly identical efficiency regardless of where they are installed. According to the 0 degree slope example, this motor's peak efficiency is at 320 RPM. The rear motor setup will only operate at peak ef...
by donn
May 05 2021 8:54am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 857

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

You simulated the mid drive only in one fixed gear. Where do you see that? In the simulation, I assume the ideal situation, that the bicycle has an infinite number of gears. So, by switching, the mid drive motor speed remains constant at all travel speeds. ... which speed he identifies on some of t...
by donn
May 04 2021 4:21pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 857

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

I don’t know where your comparison come from, but I assure you that the acceleration of a 250w hub is desperately lame as compared to a 250w BB drive on the low cog. There must be some problem with his simulation, then. It's in the article he links to. We should bear in mind that your kind of bicyc...
by donn
May 04 2021 1:06pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 857

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?
by donn
May 04 2021 11:32am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 857

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

I mean, if you are building a low power bike, a mid drive does let you build it much lighter and still give it good torque. Would you consider his "250W" motor to be "low power"? He uses the same motor for both, in the simulation, and the theoretical advantage appears in the res...
by donn
May 04 2021 9:44am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 857

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

I wonder if anyone has any comments on the article, beyond just the subject statement? He recites the theoretical explanation of the virtues of a crank drive in the article. What I'd like to know is whether the analysis is accurate. The terms he's reporting are a mystery to me - η, Pin, Ploss. I can...
by donn
Apr 17 2021 5:01pm
Forum: EBike General Discussion
Topic: How to guess wiring for three speed switch
Replies: 10
Views: 394

Re: How to guess wiring for three speed switch

For what it's worth, a Lyen manual online indicates black wire for ground - no mention of a 3-speed switch, but black grounds on everything else.

The "continuity" test may look like Ω on your tester.
by donn
Apr 16 2021 10:28pm
Forum: EBike General Discussion
Topic: Rans Stratus - Recumbent
Replies: 11
Views: 574

Re: Rans Stratus - Recumbent

Yes but it costs you 25-100w to 'freewheel pedal', depending on speed, wheel size, and motor choice. That sounds like a pretty poor motor choice. Grin says around 10-30W. I don't have a very good feel for the core loss in mine - it seems to come and go depending on the grade, at grades that all see...
by donn
Apr 13 2021 9:35am
Forum: EBike General Discussion
Topic: Rans Stratus - Recumbent
Replies: 11
Views: 574

Re: Rans Stratus - Recumbent

I haven't tried this, but Grin's Phaserunner type controllers are supposed to be able to be configured to supply a low base level current that just compensates for the core loss that otherwise makes a direct drive a little unpleasant to pedal unpowered. It costs very little in battery power - empiri...
by donn
Apr 10 2021 2:10pm
Forum: EBike General Discussion
Topic: Rans Stratus - Recumbent
Replies: 11
Views: 574

Re: Rans Stratus - Recumbent

What neptronix recommends there is just about exactly what I did with my old Ryan Vanguard, and it ran pretty well. Except I left the regen configured to the the usual modest force. Then I moved the motor to a Burley Limbo, because the Vanguard is such a fine classic ride on its own, and at the high...
by donn
Apr 05 2021 9:47pm
Forum: EBike General Discussion
Topic: Are footpegs superior if you don't pedal?
Replies: 36
Views: 5470

Re: Are footpegs superior if you don't pedal?

My guess for most frames Bicycle frames, that is, am I right? For an electric scooter, the principles behind bicycle ergonomics are somewhat misplaced. For an ideal ride, some kind of moped frame would probably work a whole lot better. Maybe one of those mini-motos that were popular a few years bac...
by donn
Mar 23 2021 9:33am
Forum: EBike General Discussion
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1965
Views: 255888

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I'm interested in seeing how this turns out for you. I've found the opposite; increasing regen decreases range because the bike brakes harder and the time regen is active is shorter. Moderate regen seems to pay the most dividends on my bike, but maybe that also has to do with terrain and riding con...
by donn
Mar 21 2021 10:02am
Forum: EBike General Discussion
Topic: DIY Bottom Bracket Torque Sensor?
Replies: 11
Views: 485

Re: DIY Bottom Bracket Torque Sensor?

it would've been a potentiometer mounted to the pivot of a springloaded roller on the top side of the chain, and the voltage on the pot would've been detected by an op-amp and amplified and turned into a throttle signal, calibratable with pots on the op-amp...there are better ways to do it but that...
by donn
Mar 18 2021 2:01am
Forum: EBike General Discussion
Topic: The E Bike Act HR1019
Replies: 5
Views: 237

Re: The E Bike Act HR1019

Different way to say the same thing. If you're shopping for an electric bicycle, and I give you, and you only, $1,500 to help buy a nice one, then that's just good for you. If I give everyone $1,500 max, then the prices will go up so you pay the same. This is more reliably true with something like t...
by donn
Mar 17 2021 10:59pm
Forum: EBike General Discussion
Topic: The E Bike Act HR1019
Replies: 5
Views: 237

Re: The E Bike Act HR1019

Yeah, great idea - Federal government doesn't send enough of your tax money to China.

Someone should break it to him, though, that today's cool thing is electric foot scooters.
by donn
Mar 12 2021 10:33am
Forum: EBike General Discussion
Topic: Chicken... meet egg. My trike quandary
Replies: 44
Views: 698

Re: Chicken... meet egg. My trike quandary

You'll see a Burley Limbo in Surrey I found that listing. $600, right? It certainly doesn't appear to be anything remotely capable of mountain trails though. Am I missing something? Not at all, it's for roads as far as I'm concerned, though there's likely some grey area between the two - as there i...
by donn
Mar 11 2021 8:38pm
Forum: EBike General Discussion
Topic: Chicken... meet egg. My trike quandary
Replies: 44
Views: 698

Re: Chicken... meet egg. My trike quandary

I need stuff available here. If COVID restrictions are lifted in short order, I don't mind picking up from a shipping address in WA state. 2) terrain. You might have a look at craigslist. Nothing much on the BC side of the border, but some of your preferred options are to be found less than 100km s...
by donn
Mar 11 2021 5:53pm
Forum: EBike General Discussion
Topic: E-ASSIST not throttle rocket!
Replies: 13
Views: 406

Re: E-ASSIST not throttle rocket!

SlowCo: I have considered a Tongsheng middrive. I watched a lot of Tim's YT vid which were helpful. It would solve the imbalance issue. I would lose my Patterson but keep the Alfine. You'd lose both. Or rather, you'd put the Patterson aside, and you'd really lose the Alfine. The crank drive will de...
by donn
Mar 11 2021 10:24am
Forum: EBike General Discussion
Topic: E-ASSIST not throttle rocket!
Replies: 13
Views: 406

Re: E-ASSIST not throttle rocket!

It's true that if you have a motor, as long as the battery is good, gear shifts are less important, so it will be easier to get along without the Alfine. Until the battery runs down. Personally, I do shift quite a bit, but the point is I don't strictly need to, so if I'm stopped in high gear, that i...
by donn
Mar 10 2021 10:24am
Forum: EBike General Discussion
Topic: E-ASSIST not throttle rocket!
Replies: 13
Views: 406

Re: E-ASSIST not throttle rocket!

I'm not sure we have what you want here. The thing for you might be to get yourself to a local mechanic/retailer who takes an interest in these matters. From here, A&B Cycle looks like a good bet. Here, you're going to get a lot of discussion that goes every which way and will be hard to accurat...
by donn
Mar 06 2021 10:13am
Forum: EBike General Discussion
Topic: Thumb throttle CRUISE CONTROL no cost in 2 seconds
Replies: 13
Views: 667

Re: Thumb throttle CRUISE CONTROL no cost in 2 seconds

You could find a way to hook up a silder switch - like those you find for the dining room table that dims the light. I hooked it to an unused switch on some handlebar control I had - honestly, I forget, which is easy because I never for a moment had any desire to turn the cruise control off. I don'...
by donn
Feb 27 2021 10:39am
Forum: EBike General Discussion
Topic: Help with an e-bike for my courier job
Replies: 20
Views: 631

Re: Help with an e-bike for my courier job

If you mean a 30-40' canopy over your charging station, great. More like this: https://www.recumbent.news/wp-content/uploads/2020/04/recumbent-bike-winning-the-Sun-Trip-race-of-solar-bikes.jpg Photovoltaic 405 W peak: Clean Fizz panels 2.35 m² 132 cells Sunpower C60 Solar charger: 2 Génasun 54.2 V ...