Search found 313 matches

by wturber
Dec 13, 2017 9:22 pm
Forum: E-Bike General Discussion
Topic: Anyone use fairings? Why not...?
Replies: 28
Views: 794

Re: Anyone use fairings? Why not...?

It points out that upright bike riders are the most conformist people in the world. Nah. Sure, cyclists will follow silly trends and fads just like any other group. Heck, that's what people, in general, do. But the trends don't succeed for very long unless there a good perceived cost/benefit ratio....
by wturber
Dec 13, 2017 4:44 pm
Forum: E-Bike General Discussion
Topic: Anyone use fairings? Why not...?
Replies: 28
Views: 794

Re: Anyone use fairings? Why not...?

Back in the 1990's, this guy used to ride in many of the IHPVA races. http://4.bp.blogspot.com/_LWGcbKlwPjU/TC9EoHK-YsI/AAAAAAAAATY/m19YKJC-tAA/s1600/R1-+7A.jpg It seemed like the most practical, effective upright fairing going. If so, then its commercial success (or lack of such) points out the ra...
by wturber
Dec 13, 2017 3:02 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

eCue wrote:
Dec 13, 2017 2:26 pm
I will try the 1200w enclosure version its about the perfect size for the 350w motor if it gets hot can add a 2nd and 3rd fan and a few heatsinks to the chips , be nice to get its spec rating.
I'd expect that to work fine for a 350w motor.
by wturber
Dec 13, 2017 1:28 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

The 30A version has two coils. I think there's more to it than a different heat sink. I agree that the designs seem similar to myself as a layperson. I read an article somewhere on the design of boost converters. Never fully understood it but if I remember correctly, the capacity of the converter i...
by wturber
Dec 13, 2017 12:32 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

Yes. 85% efficiency may be too great of a loss to suffer in this application. I hadn't noticed that. The 20A 1200w version looks like its the same electrical design as the 30A version.they actually look identical. ? Its ;like they added heat sinks to the 20A version and boom its now a 30A booster , ...
by wturber
Dec 12, 2017 6:11 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

You can set a current limit with the 30A booster. But if the controller limits you to 11A, then I don't see why you'd need to set it. OTOH, if you don't expect a future need for more amperage, then it makes sense to get the lower rated device. It might even make sense to get one of the devices that ...
by wturber
Dec 12, 2017 4:24 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

Putting together a case for the Wagndd22 1500 w 30a booster would be pretty easy if you can handle a hacksaw, epoxy and a drill. I intend to do that at some point.
by wturber
Dec 12, 2017 11:02 am
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

It's been tried over the years with a few different methods, with varying degrees of success, but most of them weren't cheap, or not easy to use. So, thank you all for doing this work. :) Necessity is the "mother of ... " and all that. I gave this a go mostly because I just didn't want to spend a l...
by wturber
Dec 10, 2017 3:09 am
Forum: E-Bike General Discussion
Topic: Cute Q100 lightweight builds slow mtb, fast road
Replies: 283
Views: 33256

Re: Cute Q100 lightweight builds slow mtb, fast road

In keeping w/ this idea, it seems to me that starting at the bottom in PAS 1 (if that is what he is doing), might not be the best technique for a truely steep hill. Starting slow on low power isn't going to get one that far. It seems to me, hitting the bottom in pas 5 and pedaling like heck and tog...
by wturber
Dec 08, 2017 7:39 pm
Forum: E-Bike General Discussion
Topic: OpenEbike - open source frame design
Replies: 15
Views: 290

Re: OpenEbike - open source frame design

- ultra light - we use honeycomb structure to reduce mass Those honeycomb spacers might look cool; but they are not triangulated and will flex in plane and could shear under high stress or impact. Yes. I thought that the lightweight honeycomb structure used in aerospace were typically sandwich stru...
by wturber
Dec 08, 2017 4:09 pm
Forum: E-Bike General Discussion
Topic: Cute Q100 lightweight builds slow mtb, fast road
Replies: 283
Views: 33256

Re: Cute Q100 lightweight builds slow mtb, fast road

I guess the other thing I might mention is, remember to never let the climbing speed fall below half of the top speed, which, in your case, would be around 10 to 12 mph. If you hit a hill where you can feel the motor start to "lug-down", it's time to jump off and walk up. I assume that's so the mot...
by wturber
Dec 08, 2017 1:51 pm
Forum: E-Bike General Discussion
Topic: Cute Q100 lightweight builds slow mtb, fast road
Replies: 283
Views: 33256

Re: Cute Q100 lightweight builds slow mtb, fast road

Great info. Can you post a link to the carbon bars from Amazon? I'm betting it is one of these. I have this or something nearly identical and find it very handy. https://www.amazon.com/MaxMiles-Accessories-Handlebar-Extension-Flashlight/dp/B076BH88YB/ref=sr_1_4?ie=UTF8&qid=1512759044&sr=8-4&keyword...
by wturber
Dec 08, 2017 12:52 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

FWIW, I did try to do a run last night direct to the battery but with the batter at 39 volts, but the battery sagged below the controller's 38v cuttoff and I couldn't really get going. It might be possible to do this with a fresh 42v charge.
by wturber
Dec 07, 2017 8:44 pm
Forum: E-Vehicles General Discussion
Topic: Madness. Why such slow penetration for hybrid?
Replies: 60
Views: 1041

Re: Madness. Why such slow penetration for hybrid?

Concerning oil companies: "How does a billion-dollar company pay no taxes?" https://www.nytimes.com/2017/03/09/business/economy/corporate-tax-report.html OTOH ... https://www.forbes.com/sites/christopherhelman/2012/04/16/which-megacorps-pay-megataxes/#1399422f5586 Of course, it is always important ...
by wturber
Dec 07, 2017 8:14 pm
Forum: E-Vehicles General Discussion
Topic: Uniti — Swedish EV Startup
Replies: 6
Views: 511

Re: Uniti — Swedish EV Startup

Well, if all the cars on the road had similar masses then maybe this would be OK. But with other cars being more massive and with a small vehicle going at speeds much faster than 25 mph, I see the small size a being a major problem in trading off cockpit integrity vs crumple zones. This is bad enoug...
by wturber
Dec 07, 2017 7:24 pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 4711
Views: 251779

Re: new eZip motor

I know now from what I learned here and from running LiPo that if I would have used them up those hills even though they may have made it there would have been a considerable amount of sag in voltage and several miles of future use would have been lost. Needless to say 1/3 mile of walking probably ...
by wturber
Dec 07, 2017 12:49 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

Do you notice the difference on hills? otherDoc I hadn't really thought about it earlier, but I can't do a "proper" test at 36v because I don't have a 36v controller. Any results running 42 volts through a 48 volt controller could be compromised if the voltage sag exceeds the low voltage cutoff - t...
by wturber
Dec 07, 2017 12:05 pm
Forum: E-Vehicles General Discussion
Topic: Madness. Why such slow penetration for hybrid?
Replies: 60
Views: 1041

Re: Madness. Why such slow penetration for hybrid?

Actually, in at least this case there was a U.S. subsidy. Billions of dollars of it. Hmm. I thought that all the US dollars paid to Abengoa (in the form of purchases and loan guarantees) were for projects within the US, including solar power stations and ethanol fuel processing facilities. Did thos...
by wturber
Dec 07, 2017 3:45 am
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

"No load" (free spinning wheel) speed with boost converter at 54 v = 42.7mph "No load" (free spinning wheel) speed direct to battery at 41 v = 32.1mph These numbers match pretty closely to what is predicted for a 9C+ 2706 motor on the Grin Motor Simulator. I'll see if I can find time at lunch to tak...
by wturber
Dec 06, 2017 9:24 pm
Forum: E-Bike General Discussion
Topic: Electric Cargo-bike POWER system for steep terrain?
Replies: 38
Views: 1494

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

I don't see much wiggle room in the Washington State law. RCW 46.04.169 Electric-assisted bicycle. "Electric-assisted bicycle" means a bicycle with two or three wheels, a saddle, fully operative pedals for human propulsion, and an electric motor. The electric-assisted bicycle's electric motor must h...
by wturber
Dec 06, 2017 6:02 pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 4711
Views: 251779

Re: new eZip motor

And that jibes with my practical test and estimate of about 7 miles for one of these packs ... if you take it easy.
by wturber
Dec 06, 2017 3:11 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

I have one bike with a 36 volt system. It has a old Goldenmotor FePo4 rackmount 12 aHr battery pack and a Bafang SXWU motor . Works fine but I notice the top end drop off as the voltage drops from the 42 volt nominal full charge. I am thinking of getting one of these just to keep to nominal voltage...
by wturber
Dec 06, 2017 1:43 pm
Forum: E-Bike Technical
Topic: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike
Replies: 87
Views: 2137

Re: Using the Wangdd22 1500W 30A DC Boost Converter on an ebike

36v to/ 60v should be about 92% efficient not bad considering the benefit Curious just how many mph was gained on the flats using the Booster ? Quote from spec sheet ~ Conversion Efficiency: 92% to 97% (Efficiency is related to input/output voltage, current and voltage difference. The smaller diffe...
by wturber
Dec 06, 2017 10:19 am
Forum: Items for Sale - New
Topic: Custom Waterjet Cut Parts
Replies: 100
Views: 15403

Re: Custom Waterjet Cut Parts

Get your design ready now for our sale December 11-12 on aluminum 6061 in 0.25 inch thickness. More details: https://www.bigbluesaw.com/big-blue-saw-blog/general-updates/sale-coming-next-week-aluminum-6061-0-25.html The information given is very sparse on details. What kind of quantities? How much ...
by wturber
Dec 06, 2017 10:17 am
Forum: E-Bike General Discussion
Topic: $600 mixed ebike kit from China 350w MXUS wheel
Replies: 60
Views: 1487

Re: $600 mixed ebike kit from China 350w MXUS wheel

The C1 parameter in the LCD3 settings for KT controllers is for optimizing the S-V12 PAS sensor for disks with different numbers of magnets. I never bothered to play with it. Ahh - that makes sense now. 12 signal means 12 magnets!! Got it! Thanks. I really should write up a cheat/sheet for these LC...