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by Chalo
Apr 22, 2018 11:41 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 90
Views: 1383

Re: The ultimate torque arm (For <2kW and standard axles)?

Wedge Locking washers like the NordLock must engage the two faces on either side to work. [...] so to release the nut takes more torque than for it to stay where it is, Nope. With or without a softer surface to bite into, they release at a lower torque than an ordinary flat washer. Chalo apparently...
by Chalo
Apr 21, 2018 10:37 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 90
Views: 1383

Re: The ultimate torque arm (For <2kW and standard axles)?

Wedge Locking washers like the NordLock must engage the two faces on either side to work. [...] so to release the nut takes more torque than for it to stay where it is, Nope. With or without a softer surface to bite into, they release at a lower torque than an ordinary flat washer. WbLS3rGtKDM
by Chalo
Apr 21, 2018 10:30 pm
Forum: E-Bike General Discussion
Topic: E bike Gearing Why Bother
Replies: 15
Views: 248

Re: E bike Gearing Why Bother

I'm glad to have variable gearing on my BBS02, even though I mostly run it in the lowest two gears. When I first set up my mid drive, I used it almost exclusively with PAS, and I switched mostly between 46/16 and 46/19. Then I installed shorter cranks on it, so I could follow the motor up higher int...
by Chalo
Apr 21, 2018 7:58 pm
Forum: E-Bike General Discussion
Topic: Bike Mileage
Replies: 7
Views: 131

Re: Bike Mileage

So while you might pedal up 5 of those wh/mi at 20 mph, its not happening at 35 mph, because of gearing. ( you'd be clown pedaling) I put 152mm cranks on my BBS02 (most of my bikes have 185mm or longer) so I could better follow the motor into its upper RPM range. Sometimes it feels pretty clownish....
by Chalo
Apr 21, 2018 5:16 pm
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1932

Re: stop huffin

Toorbough ULL-Zeveigh wrote:
Apr 21, 2018 5:07 pm
[tripe]
Once again posting nothing of value, probably while drunk. Congrats, you now own the second ever spot on my STFU list. You can chat with Dauntless over there.
by Chalo
Apr 20, 2018 7:46 pm
Forum: E-Bike Technical
Topic: Torque arm options for these drop outs
Replies: 4
Views: 88

Re: Torque arm options for these drop outs

How much power are you using? What motor and voltage?

For most legal-ish e-bikes, your right side torque arm would be more than adequate. Is there not a corresponding eyelet on the other side?
by Chalo
Apr 20, 2018 6:08 pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 116
Views: 8571

Re: The end of BionX?

Jeebus, welcome to N. American business acumen. Partnering with GM? That seems like something you'd only do if you were a big enough player to take over the remnants after they destroy themselves. Any bike industry business that's stupid enough to collaborate with a stinking car business deserves t...
by Chalo
Apr 20, 2018 2:15 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 90
Views: 1383

Re: The ultimate torque arm (For <2kW and standard axles)?

The two-piece design would benefit from the laminar construction of the open-sided design. That would make it cheaper to manufacture and feasible to have a full thickness interface at the axle (and a continuous clamping surface). It would require spot welding or perhaps riveting to permanently align...
by Chalo
Apr 20, 2018 1:33 pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 115
Views: 3184

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Your preliminary test results concur with my experience running a Crystalyte 5305 at 36V/35A in a Surly Karate Monkey fork. Initially, I lightly filed the fork tips until the fit was as conformal as I could make it. It had not been in service very long at all by the time I noticed the fork tips had ...
by Chalo
Apr 19, 2018 9:08 pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 115
Views: 3184

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Cool real world testing! Sadly, your range of sacrificial junk pretty closely represents what today's cheap e-bike buyers are getting for their money. A short few years ago, it seemed like the cheapest sort of turn-key e-bikes were fitted with front hub motors. Now it seems like they mostly have rea...
by Chalo
Apr 19, 2018 12:52 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 90
Views: 1383

Re: The ultimate torque arm (For <2kW and standard axles)?

I don't need luck, I've got math & physics. One day you'll learn how to use them, kid. This, from you, Chalo. Really! And "kid" :) I could get into more math and physics related to your design, but you're stuck at general engineering principles. If you can't get beyond that, there's no point.
by Chalo
Apr 19, 2018 1:19 am
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 90
Views: 1383

Re: The ultimate torque arm (For <2kW and standard axles)?

Buk___ wrote:
Apr 18, 2018 9:24 pm
I don't need luck, I've got math & physics.
One day you'll learn how to use them, kid. Best of luck with that.
by Chalo
Apr 19, 2018 1:15 am
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1932

Re: Is REGEN, really worth it ?

A direct drive motor is heavier than a gear reduced free overrunning motor, all else equal. A battery that can store regen energy on demand is necessarily bigger and heavier than a battery sized only for the drive load, all else equal. Apples to oranges. Geared hubs can have regen (leave out the fr...
by Chalo
Apr 18, 2018 5:29 pm
Forum: E-Bike General Discussion
Topic: Best Full Suspension ebike Frames?
Replies: 60
Views: 12133

Re: Best Full Suspension ebike Frames?

https://pixl.varagesale.com/http://s3.amazonaws.com/hopshop-image-store-production/100715525/236a2f9bd647c88744d7dbc3cf9cb58b.jpg?_ver=large_uploader_thumbnail&w=640&h=640&fit=crop&s=ad564f4e0f28163427b0daae2bf06a7b Probably not the best shock design, and not the biggest triangle - but hey: this fr...
by Chalo
Apr 18, 2018 3:58 pm
Forum: E-Bike General Discussion
Topic: Stongest tandem ebike wheel build help
Replies: 55
Views: 1245

Re: Stongest tandem ebike wheel build help

You'd be much better off with 14ga and even better with 14/15ga butted.

What you've got is going to self loosen, crack your rim, or both.

The strength of the wheel is in the rim, not the spokes.
by Chalo
Apr 18, 2018 2:58 pm
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1932

Re: Is REGEN, really worth it ?

miro13car wrote:
Apr 18, 2018 7:37 am
what extra weight?
A direct drive motor is heavier than a gear reduced free overrunning motor, all else equal. A battery that can store regen energy on demand is necessarily bigger and heavier than a battery sized only for the drive load, all else equal.
by Chalo
Apr 18, 2018 2:53 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1848
Views: 49718

Re: Wind and Solar vs Coal, Gasoline, Nuclear

A sound cost-analysis, except for just a couple of tiny details: It doesn't include: Insurance Fuel Maintenance Repairs Waste disposal Decommissioning Don't forget externalities! Accidents Persistent radioisotope contamination Cancer Facilities security Lost property value Etc. How profitable was F...
by Chalo
Apr 18, 2018 1:54 pm
Forum: E-Bike General Discussion
Topic: Adjusting Mechanical Disc Brakes
Replies: 5
Views: 170

Re: Adjusting Mechanical Disc Brakes

Note that the uneven fit of some calipers to their mounts and bolts can cause then to shift when tightened, flexing the rotor and negating the technique you have described. The best way to avoid this is to gently snug up the mounting bolts a little bit at a time, switching back and forth between the...
by Chalo
Apr 18, 2018 1:40 pm
Forum: Battery Technology
Topic: Straight Answer on Using Lithium Power Tool Batteries
Replies: 4
Views: 174

Re: Straight Answer on Using Lithium Power Tool Batteries

It depends. Some cordless tools require an electronic "handshake" between the battery and the device before the battery will send power. Most don't, in my experience. Does the drill (or whatever) that goes with the battery have only two contacts, or does it have more? If it does, you can bet they ar...
by Chalo
Apr 16, 2018 11:37 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 90
Views: 1383

Re: The ultimate torque arm (For <2kW and standard axles)?

The torque reaction of the motor on the torque arm via the axle flats is from motor torque reaction, and will be limited to that which the motor can magnetically produce. Vehicle weight doesn't enter into it. It matters to the degree that inertia, weight, and surface adhesion are the forces that th...
by Chalo
Apr 16, 2018 2:15 pm
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1932

Re: Is REGEN, really worth it ?

After two years of driving the PluginPrius, I still giggle about every time I come to a full stop, and watch the EV range click up a couple tenths of a mile. I'm averaging high 50's mpg, without even trying hard, thanks to regen. In the meantime, even stinking two stroke gas bikers are doubling or ...
by Chalo
Apr 16, 2018 1:53 pm
Forum: E-Vehicles General Discussion
Topic: Titanium bikes set to get cheaper?
Replies: 12
Views: 183

Re: Titanium bikes set to get cheaper?

Even if raw titanium becomes cheaper, it will remain difficult and expensive to manufacture things from it. For that reason, I don't think we can look forward to cheap Ti bikes anytime soon. Sub-$1000 Ti frames, maybe. But not sub-$1000 Ti bikes anymore.
by Chalo
Apr 16, 2018 12:55 pm
Forum: E-Vehicles General Discussion
Topic: Titanium bikes set to get cheaper?
Replies: 12
Views: 183

Re: Titanium bikes set to get cheaper?

There are some pretty cheap titanium bikes around, probably from China already. For the last 20 years, budget titanium bike frames have been a mix of Chinese and Russian (or other former Eastern Bloc) production. Here, i think Ti bike frames were originally a commercial spinoff from the nuclear ind...
by Chalo
Apr 16, 2018 12:58 am
Forum: E-Bike General Discussion
Topic: Motorcycle-Brakes on eBike?
Replies: 32
Views: 419

Re: Motorcycle-Brakes on eBike?

My first modern disc brake was a Hayes MX-1. The stock Hayes organic pads burned away to nothing in less than 20 miles of city riding (with almost 500 pound gross weight, and very steep hills). The fully metallic EBC replacement pads lasted about 10 years and thousands of miles of varied riding. Tha...
by Chalo
Apr 16, 2018 12:22 am
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 90
Views: 1383

Re: The ultimate torque arm (For <2kW and standard axles)?

Alan B wrote:
Apr 15, 2018 10:41 pm
There's not much point in arguing about it, only testing can prove anything. Build some and fail them with a torque wrench, as Justin has done so many times.
What I'm sayin'. I don't have to prove the design is bunk; he can just try it out and see for himself.