Search found 1354 matches

by Balmorhea
Nov 13 2020 12:00am
Forum: EBike General Discussion
Topic: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?
Replies: 28
Views: 1103

Re: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?

Justin from Grin Tech explains that the torque for different kv motors will be the same, and efficiency is also the same, Torque per amp is not at all the same from different motor windings. It's only the maximum possible torque that's the same, and that implies very different controllers and batte...
by Balmorhea
Nov 11 2020 8:25pm
Forum: General Discussion
Topic: What is a good source for larger cranks and sets
Replies: 29
Views: 839

Re: What is a good source for larger cranks and sets

[*] ya know where I've seen big chain rings, its on tiny wheel folding bikes... No idea where you'd buy these as a standalone part. Also stationary exercise bikes. It's fairly common for those to have 60-64 tooth chainwheels. Hostel Shoppe is the longstanding supplier for oversized chainrings, but l...
by Balmorhea
Nov 11 2020 1:32am
Forum: General Discussion
Topic: Legends dropping like flies
Replies: 434
Views: 70679

Re: Legends dropping like flies

markz wrote:
Nov 09 2020 4:25am
Alex Trebek was Canadian!
In the end, that didn't help.
by Balmorhea
Nov 10 2020 9:04pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

The Toecutter wrote:
Nov 10 2020 9:02pm
For a bicycle application, the larger sized wheels make sense, if only to keep the rear derailleur as far off the ground as possible.
It's for ride comfort, rolling efficiency, and traction on less than smooth surfaces.
by Balmorhea
Nov 10 2020 9:01pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

They are and they do, if you stick to normal/low cost batteries, controllers, cables, and connectors. So maybe this syntax? Getting high torque and better efficiency at low speeds requires higher turn count motors, or spending lots more on your controller, battery pack etc. Both are absolutely inco...
by Balmorhea
Nov 10 2020 8:58pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

All the 26" and up stuff is made for export, not for their domestic use, simply to meet demand from consumers who don't know better. Any idea that a 26" or larger wheel is a prerequisite for a good pedal bike is just silly. Your confusing style with truth. It's like you've never heard of ...
by Balmorhea
Nov 10 2020 8:01pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

ZeroEm wrote:
Nov 10 2020 6:07pm
I'm wanting one of them 36" wheeled bikes but all sold out. They are working on a E-bike version, what do you think?
That's a big wheel for any existing hub motor to deal with. It's a better candidate for a mid drive.
by Balmorhea
Nov 10 2020 4:50pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

Remember that it required me repeatedly correcting you about windings until you finally got it and stopped putting forward that nonsense about higher turn count motors being more efficient at low speeds and climbing hills better. They are and they do, if you stick to normal/low cost batteries, cont...
by Balmorhea
Nov 10 2020 3:52pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

That motor-wheel combo [6T 1500W Leaf, 29" wheel] has a free speed close to 40 mph, top speed of about 28 without help at the pedals. Achieving only 70% of no load speed is a sure indication that the motor is grossly too steeply geared. I was wondering about that myself, so I pulled up the whe...
by Balmorhea
Nov 07 2020 6:24pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

go for an 8T motor, because I don't really have any use for speed over 25 mph, and I would appreciate better takeoff torque and cruising efficiency. Sounds god to me! I assume takeoff torque is related to heavy weight climbing steep hills. I cannot go smaller than 26" O.D. but using 3+" t...
by Balmorhea
Nov 07 2020 6:08pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

3T and 6T winds both have the most copper present of all versions, and are therefore capable of the highest continuous torque of all versions, they just differ on how much torque they make per amp(the 3T has roughly twice continuous current rating of the 6T, but the 6T makes roughly twice as much t...
by Balmorhea
Nov 07 2020 3:21am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1927
Views: 250040

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

An efficient hub motor would make sense in this use case if I can get enough torque on the large wheel. 6T 1500W Leaf motor running on 48V 35A in a 29" wheel will slay your hills, unless you're very heavy or they are freakishly steep. That's what I use with an extremely heavy bike GVW, 450ish ...
by Balmorhea
Oct 29 2020 10:50am
Forum: General Discussion
Topic: What is a good source for larger cranks and sets
Replies: 29
Views: 839

Re: What is a good source for larger cranks and sets

Have not tried this but would like to remove my smallest ring gear and add a larger ring gear to the outside. Have 50/39/30 would like 60/50/39, has anyone done this? The main concern would be the front derailleur. When its curvature is tighter than that of the large chainring, it must be mounted t...
by Balmorhea
Oct 28 2020 3:27am
Forum: EBike General Discussion
Topic: Slowest wind direct drive hub motor(s) available?
Replies: 63
Views: 1691

Re: Slowest wind direct drive hub motor(s) available?

Spoke count was the same? What forks were being used? Both 36 spokes. The 29er uses the stock Redline Monocog rigid chromoly fork. It's a generic unicrown fork with slightly beefier than normal dropouts. https://endless-sphere.com/forums/viewtopic.php?t=26444&start=175#p1505427 The cargo bike u...
by Balmorhea
Oct 28 2020 3:05am
Forum: EBike General Discussion
Topic: Slowest wind direct drive hub motor(s) available?
Replies: 63
Views: 1691

Re: Slowest wind direct drive hub motor(s) available?

Balmorhea, Earlier in the thread you described two wheel and tire combos: https://endless-sphere.com/forums/viewtopic.php?f=3&t=108827&start=25#p1593452 One thing i can't help but wonder about is the spokes and rim on both wheels. Can you tell me what those are? Also direct drive or geared ...
by Balmorhea
Oct 28 2020 2:10am
Forum: General Discussion
Topic: What is a good source for larger cranks and sets
Replies: 29
Views: 839

Re: What is a good source for larger cranks and sets

(been offline a week). note that 'freewheels' refers to the old school threaded clusters, mostly 5 or 6 speed. anything made since the late 70s uses a Cassette instead, That's very much not true; cassettes came into fashion around 1990, and still aren't used on the cheapest entry level bikes or mos...
by Balmorhea
Oct 28 2020 12:57am
Forum: EBike General Discussion
Topic: Slowest wind direct drive hub motor(s) available?
Replies: 63
Views: 1691

Re: Slowest wind direct drive hub motor(s) available?

A shorter but wider contact patch (resulting from a smaller diameter but wider tire) can actually have less sidewall deformation even if it is larger. It has to reconcile a lot more distortion along the lengthwise axis. So it must be especially wide before tread scrub isn't a serious rolling resist...
by Balmorhea
Oct 27 2020 5:00pm
Forum: EBike General Discussion
Topic: Slowest wind direct drive hub motor(s) available?
Replies: 63
Views: 1691

Re: Slowest wind direct drive hub motor(s) available?

There are rolling resistance and handling penalties that come with very fat, low pressure tires. A wider tire doesn't have to be higher rolling resistance with poor handling. Hypothetically, you may be right. But in practice, a tire fat and soft enough to offset the ride shortcomings of a small dia...
by Balmorhea
Oct 27 2020 2:13pm
Forum: EBike General Discussion
Topic: Slowest wind direct drive hub motor(s) available?
Replies: 63
Views: 1691

Re: Slowest wind direct drive hub motor(s) available?

Yes, a small diameter wheel can fall deeper into a "dip" than a large diameter wheel but at the same time the inflation pressure of the small diameter tire can be lower if it is sufficiently wider. The larger diameter wheel also rides cushier with lower tire pressure, and because of its l...
by Balmorhea
Oct 27 2020 1:08pm
Forum: EBike Technical
Topic: electrical question: horn cuts my engine
Replies: 22
Views: 690

Re: electrical question: horn cuts my engine

Those voltage spikes get stuffed largely into the cap instead of the bus The cap has an internal resistance at least an order of magnitude higher than the bus. Why would the spike get stuffed into the cap instead of taking the path of (literally) least resistance down the bus? :mrgreen: I haven't s...
by Balmorhea
Oct 26 2020 10:53pm
Forum: EBike General Discussion
Topic: How practical is 72v (or 60v) for a street legal direct drive set-up meant for climbing and sub 28 mph speed?
Replies: 124
Views: 3196

Re: How practical is 72v (or 60v) for a street legal direct drive set-up meant for climbing and sub 28 mph speed?

...the bicyclist exists and consumes his fuel regardless. A fallacy that defies the laws of physics unless the energy expended for transportation also replaces exercise that would be done if not cycling. Fit active bodies are more efficient than motorist bodies. Their food requirements are not in p...
by Balmorhea
Oct 26 2020 8:40pm
Forum: EBike General Discussion
Topic: How practical is 72v (or 60v) for a street legal direct drive set-up meant for climbing and sub 28 mph speed?
Replies: 124
Views: 3196

Re: How practical is 72v (or 60v) for a street legal direct drive set-up meant for climbing and sub 28 mph speed?

Using the same reasoning as yours we can state that a man commuting 20 miles on a bicycle, does consume more resources than another one doing the same ride on an ebike, simply because the transformation of food into energy is the least efficient energy production means. Advanced medical care, and l...
by Balmorhea
Oct 26 2020 6:58pm
Forum: EBike Technical
Topic: electrical question: horn cuts my engine
Replies: 22
Views: 690

Re: electrical question: horn cuts my engine

Not sure what a cap in parallel would do, except maybe explode eventually. :wink: I just told you what it will do in my above post. Those voltage spikes get stuffed largely into the cap instead of the bus, and released at lower voltage after the spike subsides. It's like using a spring to provide s...
by Balmorhea
Oct 26 2020 4:14pm
Forum: E-Vehicles General Discussion
Topic: United States Ends ICE
Replies: 84
Views: 2862

Re: United States Ends ICE

Given the number of actually valuable contributors who’ve been banned permanently, it does make me wonder why this chronic polluter is still here. You can always ignore him. Already done, long ago. But he still gets quoted, and still pollutes threads and lowers the signal/noise ratio around here.
by Balmorhea
Oct 26 2020 4:12pm
Forum: EBike Technical
Topic: electrical question: horn cuts my engine
Replies: 22
Views: 690

Re: electrical question: horn cuts my engine

I'd start with a 100V, 100uF electrolytic capacitor, and a 5 kOhm resistor to discharge it. This is confusing. It does not sound like a 1st order low pass filter. Can you draw a schematic or explain what goes where? What I'm recommending is not an RC filter. It's a smoothing/damping cap with a resi...