Search found 426 matches

by donn
Jan 12 2020 10:44pm
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 1563

Re: Hub drive torque limitations. Steep hills while towing a child?

e-beach wrote:
Jan 12 2020 10:24pm
cabike.com?
I bet that's a scramble gram for ebikes.ca.
by donn
Jan 09 2020 10:10am
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 1563

Re: Hub drive torque limitations. Steep hills while towing a child?

Other than the effect of just the weight, running a big fast direct drive motor at low speed is quite efficient. So any extra load is pretty minimal, an extra 10 pounds of motor in a 250-300 pound total weight. A bigger motor can mean an extra 15 pounds of battery weight, but still not a very big p...
by donn
Jan 07 2020 2:36am
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 38
Views: 1563

Re: Hub drive torque limitations. Steep hills while towing a child?

I would also point out that there are two speed hub motors that give you a low and a high gear. Thanks for pointing that out! Though evidently not new at all, it's new to me. From a casual web search I get the impression that Xiongda owns this category, and populates it with relatively low power hu...
by donn
Dec 07 2019 11:27pm
Forum: E-Bike General Discussion
Topic: Regen
Replies: 41
Views: 1931

Re: Regen

I think the regen% on CA should be interpreted best as, 'how much larger battery I would have needed', i.e. if you recover 100% of your energy then you would have infinite range, which makes sense. I guess you never know what's going to make sense to someone else, but it's probably best to think of...
by donn
Dec 07 2019 9:46am
Forum: E-Bike General Discussion
Topic: Regen
Replies: 41
Views: 1931

Re: Regen

What you want is not regen. Get a planetary geared motor that won't resist while you pedal with it off. Then tow a relatively big trailer, big enough for a 100w solar panel. The panel will get you about 400 wh per day of extra range. That might be an interesting idea, particularly if you're already...
by donn
Dec 06 2019 1:23pm
Forum: E-Bike General Discussion
Topic: Regen
Replies: 41
Views: 1931

Re: Regen

as we know CA display Forward Ah and Regen Ah . with those AHs after my rides CA displays right % OK, here's what I have right now, after a ride a few days ago with a heavy hand on the throttle: (f - r) Ah: 1.994 (r) Regen Ah: 0.1784 (r/(f - r)) Regen 8.9% (f) Forward Ah: 2.1730 ... where by normal...
by donn
Dec 05 2019 9:22pm
Forum: E-Bike General Discussion
Topic: Regen
Replies: 41
Views: 1931

Re: Regen

and guess what? Cycle Analist do not lie. my average as CA shows is 15% return from regen braking. Actually, CA sort of does lie. It gives you the straight consumption numbers, so you can do the math yourself, but when it calculates the percentage, it's Wr/(Wf - Wr), where Wf is what goes to the mo...
by donn
Dec 05 2019 10:40am
Forum: E-Bike General Discussion
Topic: Regen
Replies: 41
Views: 1931

Re: Regen

why not just use the existing motor? Might not have it - geared hub, crank drive ... But the 2nd hub idea is uncomfortably close to "perpetual motion." It has been a long time since I went out on a long multi-day trip, but I've wondered how I'd make it work with my motor setup. Extra battery, for s...
by donn
Nov 30 2019 12:15pm
Forum: E-Bike General Discussion
Topic: 1 kW motor : rear G360, GMAC, 9C RH212, Crystalyte H3540 - or front Grin All Axle ?
Replies: 67
Views: 6849

Re: 1 kW motor : rear G360, GMAC, 9C RH212, Crystalyte H3540 - or front Grin All Axle ?

The one "trick" is that the rider must be sure to engage the ebrake (and that the signal is read by the CA3; Lever Icon is moving) before engaging the throttle(which is now Regen) It sounds obvious, but it takes a bit to get used to. When I get the sequence wrong, I'm applying Throttle, then ebraki...
by donn
Nov 14 2019 6:48pm
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

I often observe that a bicycle is a machine, but it's also like a musical instrument, sensitive to subtleties of setup and the user's technique. So if a regular bike is like a guitar, a suspension bike is ... it's like another kind of guitar. There's small and large, steel and nylon string, archtop...
by donn
Nov 14 2019 11:32am
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

I'm not so sure a lot of padding is what you need down there, though. You need enough and no more, like a good motorcycle seat. My favorite is actually one with no padding at all, it's just a sling, kind of classic lawn chair style. I guess really this whole discussion is kind of silly if it doesn't...
by donn
Nov 13 2019 12:04pm
Forum: E-Bike General Discussion
Topic: low voltage cut off when riding a long ride
Replies: 10
Views: 785

Re: low voltage cut off when riding a long ride

Bearing in mind that all of the above apparently assumes Lithium Cobalt battery chemistry, with 3.6V cells where that matters to the discussion.
by donn
Nov 13 2019 11:59am
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

Right, and I think the geared hub's down side is really more that heat issue, than efficiency lost in the gearing - I mean, that's where the heat comes from, but the direct drives are mainly just better at shedding it. So the geared hubs tend to zero in on a balance between small and powerful, where...
by donn
Nov 13 2019 1:24am
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

We seem to be talking about different things here. There is no significant aero advantage at up-hill pedaling speed, and overall, relative to an upright design, the only question is how big the disadvantage is going to be (and whether it matters.) They're open road bikes, not mountain bikes. Mine ha...
by donn
Nov 12 2019 2:11pm
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

There's a technique component to this, of course. Recumbent enthusiasts can be a little fanatic about pedaling cadence. You could look at the "stand on it" technique as a way of coping with a gearing mismatch, that of course isn't available to someone in a recumbent position, so in that case you wan...
by donn
Nov 12 2019 11:23am
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

I'm probably not ready to braze up a bicycle yet, but purely beginner non-skill has been good enough for some functional parts. The frame joints would be in large part about getting everything jigged up solid and fitting together, which I suppose is true with welding too. Slightly lower temperature ...
by donn
Nov 11 2019 5:51pm
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

As luck would have it though, it's easiest for me to go for an acetylene refill during business hours, and the local shop is open on Saturday too. The distinction between brazing and braze welding is interesting, but it isn't clear to me that it's real meaningful. The same filler material with the s...
by donn
Nov 11 2019 1:40pm
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

I took the features I needed, and welded a longtail cruiser that is my most comfortable ride to date. Anybody needing special features needs to buy a wire feed welder. If I can weld a frame, so can you. Never took a class in welding, and still weld like a monkey on lsd. But I build what I want out ...
by donn
Nov 11 2019 12:48am
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 87
Views: 5250

Re: Why not comfort bikes?

Recumbents can have larger diameter wheels, too, although with some major tradeoffs that come to mind which affect the general usability as a bicycle: Dropping in somewhat late to the party, here, I'd just say - that's all true, except it's a matter of opinion whether those are all such "major" tra...
by donn
Nov 05 2019 3:17pm
Forum: E-Bike General Discussion
Topic: High power ebike means none of the rules apply to me
Replies: 95
Views: 7477

Re: High power ebike means none of the rules apply to me

There's nothing in the law against making your own ebike in the UK. Just curious about how this works. Really it's the same anywhere, if there are laws governing the potential speed or power of your vehicle. How are such laws enforced with home-made ebikes, how do they know that it can only develop...
by donn
Nov 01 2019 11:26am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 270
Views: 13655

Re: Hub motor industry dying?

I’d like a throttle that’s it’s own thing not doing regen hooked up to possible mechanical brake as well. A simple throttle/regen brake Sure, the kit will come with a throttle, too. throttle that's its own thing, controls forward drive voltage, not regen. brake switch that overrides throttle, turns...
by donn
Nov 01 2019 9:53am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 270
Views: 13655

Re: Hub motor industry dying?

And regen I think could be very productive no? You could reasonably expect 10% less net battery drain, per trip. Still looking for a good throttle for regen That bicycle would be an odd choice for spendy, bleeding edge ebike gear. If you're using an inexpensive controller with on/off constant regen...
by donn
Oct 31 2019 11:04pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 270
Views: 13655

Re: Hub motor industry dying?

whats a low cogging hub motor? The difference between a efficient DD motor and a cheap one is about 30% reduced cogging. So make sure to get a motor with the highest peak efficiency you can get. I don't want to put words in anyone's mouth, but I think that's exactly why he asked. It seems like an i...
by donn
Oct 29 2019 10:07am
Forum: E-Bike General Discussion
Topic: Does this exist? Regen braking for ebike & trailer.
Replies: 11
Views: 715

Re: Does this exist? Regen braking for ebike & trailer.

It seems to me too that common on/off regen, as provided with inexpensive controllers, will do the job, but of course it depends on the details. Given the actual combined weight, typical descent grade, and desired speed, someone here probably knows from experience. One consistent speed across varyin...
by donn
Oct 28 2019 8:51am
Forum: E-Bike General Discussion
Topic: High power ebike means none of the rules apply to me
Replies: 95
Views: 7477

Re: High power ebike means none of the rules apply to me

Those who categorize people in two groups, always forget a third. There's two kinds of people: 1) the people who believe there are two kinds of people, and 2) the people who don't believe that. The other side is that the rules don't stop idiots from being idiots... Indeed, it's always the best for ...