Search found 583 matches

by SlowCo
Dec 17, 2017 4:58 pm
Forum: General Discussion
Topic: Buying the electric bike
Replies: 3
Views: 35

Re: Buying the electric bike

That depends on where you're from.
Search Sur-Ron on this forum and you'll find your answer.
by SlowCo
Dec 16, 2017 6:26 pm
Forum: General Discussion
Topic: Which Controller (edit: hub motor) for my daughter's wheelchair?
Replies: 59
Views: 244

Re: Which Controller (edit: hub motor) for my daughter's wheelchair?

I think you are wrong. Heat is a product of amps. Amps is a product of load and throttle position. With 4 motors, the load/motor is 1/4, therefore the amps required per motor, even if not running at peak efficiency, is much less. You also seem to think that the motor will run at a steady state from...
by SlowCo
Dec 16, 2017 1:24 pm
Forum: General Discussion
Topic: Which Controller (edit: hub motor) for my daughter's wheelchair?
Replies: 59
Views: 244

Re: Which Controller for my daughter's wheelchair?

buk___ why are you calculating with 16" wheel size and at 5km/h? Glyn has 20" rims with 2.25" tires. Most likely the diameter is >21" so the circumference will be around 21 x 25,4 = 534mm = 0.534m x 3.14(pi)= 1,67m. Although 5km/h is walking speed on a level terrain the actual average speed looking ...
by SlowCo
Dec 16, 2017 9:15 am
Forum: General Discussion
Topic: Which Controller (edit: hub motor) for my daughter's wheelchair?
Replies: 59
Views: 244

Re: Which Controller for my daughter's wheelchair?

Based upon my 'vast experience' :) of 3 rides totalling 31k, on my new Q128H, I recon that if you fitted your daughter's chair with 4 of them -- high torque, 800w geared hub motors -- she could probably climb the North face of the Eiger. I just checked and they still have them on 19% discount, mean...
by SlowCo
Dec 16, 2017 9:06 am
Forum: General Discussion
Topic: Which Controller (edit: hub motor) for my daughter's wheelchair?
Replies: 59
Views: 244

Re: Which Controller for my daughter's wheelchair?

I'm not an expert but I know that climbing a hill is all about gearing. If you ride up a hill on a normal MTB you will go down in gearing to be able to keep pedaling. The steeper the incline the lower you have to be in the gearing range to keep moving. A gearless hub motor in a 20" rim will be the s...
by SlowCo
Dec 16, 2017 8:11 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1107
Views: 27172

Re: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

Although most of this is way over my head as I'm just a simple mechanic, I do like this development very much so I'll subscribe to learn more. Thanks for all the work you're putting in!
by SlowCo
Dec 16, 2017 7:59 am
Forum: General Discussion
Topic: Which Controller (edit: hub motor) for my daughter's wheelchair?
Replies: 59
Views: 244

Re: Which Controller for my daughter's wheelchair?

Too bad you didn't listen to the advise you were given in your first thread. Because these DD motors in a 20" bicycle rim are about the worst choice you could have made for this application. At the speeds (<2mph?) your daughter will be climbing that path for hours on end those DD won't take more tha...
by SlowCo
Dec 15, 2017 7:04 pm
Forum: General Discussion
Topic: Which Controller (edit: hub motor) for my daughter's wheelchair?
Replies: 59
Views: 244

Re: Which Controller for my daughter's wheelchair?

What brand and type of motors are you going to use?
by SlowCo
Dec 14, 2017 3:30 pm
Forum: E-Bike General Discussion
Topic: OpenEbike - open source frame design
Replies: 26
Views: 467

Re: OpenEbike - open source frame design

Please let a real engineer "design" the frame instead of a "designer" who is "inspired" by honeycombs.
Or get a designer who likes triangles better than hexagons... :roll:
by SlowCo
Dec 13, 2017 6:25 pm
Forum: E-Bike General Discussion
Topic: Electric handbike
Replies: 20
Views: 358

Re: Electric handbike

Great. I hope you'll update this thread with photo's of the conversion so other people Googling might find this thread and learn from it. And I love builds like this so I'll be following also.
Good luck!
by SlowCo
Dec 13, 2017 8:36 am
Forum: E-Bike General Discussion
Topic: Electric handbike
Replies: 20
Views: 358

Re: Electric handbike

I think you're right and that option 1 is indeed the best. Although I personally would still get a 48V battery with that motor. Then even with voltage sag and going uphill you can still reach 25km/h and above. And you don't have to go faster than you like but you can if the road and circumstances ar...
by SlowCo
Dec 11, 2017 3:20 pm
Forum: Items for Sale - New
Topic: Sur-Ron - New Mid drive Bike group buy EU
Replies: 95
Views: 5545

Re: Sur-Ron - New Mid drive Bike group buy EU

I don't think scrambler is aware that the bike you're following is also a Sur-Ron (if I'm not mistaken)?
by SlowCo
Dec 11, 2017 9:12 am
Forum: E-Bike General Discussion
Topic: Electric handbike
Replies: 20
Views: 358

Re: Electric handbike

I would go with the 36V 201rpm Q128C and run it at 48V (=268rpm). That way you have a motor that can handle more power without overheating.
by SlowCo
Dec 11, 2017 4:49 am
Forum: E-Bike Technical
Topic: High wattage hub motor for 150mm drop out required
Replies: 11
Views: 232

Re: High wattage hub motor for 150mm drop out required

Basically it isn't ebike territory anymore when you want 8kW continuous... These are electric motorcycle hub motors so you should use a motorcycle frame and swing arm. Or if you have the Enduro type ebike frame with steel swing arm you can weld different end plates to it to get the 190mm dropout wid...
by SlowCo
Dec 10, 2017 1:52 pm
Forum: E-Vehicles General Discussion
Topic: And now for something completely different
Replies: 5
Views: 155

Re: And now for something completely different

They probably only import them and didn't design more than their own logo that the Chinese manufacturer sticks on the bikes before shipping...
by SlowCo
Dec 10, 2017 1:48 pm
Forum: E-Bike Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1690
Views: 471184

Re: Your Creation's Before & After Pics

Very good result!
by SlowCo
Dec 10, 2017 1:42 pm
Forum: E-Bike General Discussion
Topic: Frames from alibaba?
Replies: 9
Views: 293

Re: Frames from alibaba?

Please let us know what the shipping cost will be... :shock:
by SlowCo
Dec 10, 2017 9:29 am
Forum: Items Wanted
Topic: sydney help spoking a hub motor
Replies: 6
Views: 129

Re: sydney help spoking a hub motor

Why not let Hyena spoke you rim? Are they unable or unwilling to do so?
by SlowCo
Dec 10, 2017 9:23 am
Forum: E-Bike Technical
Topic: High wattage hub motor for 150mm drop out required
Replies: 11
Views: 232

Re: High wattage hub motor for 150mm drop out required

The combination of 150mm dropout and 8kW continuous will prove difficult, if not impossible, to find. A QS273 V3 motor has 8kW continuous but is around 190mm wide between axle flats. Maybe ask QS to turn down the disk brake side and have the axle shortened? Otherwise, if you can, do that yourself or...
by SlowCo
Dec 09, 2017 6:23 pm
Forum: E-Bike Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1690
Views: 471184

Re: Your Creation's Before & After Pics

electronicru wrote: left (before), right (after)
it was ... 1500W speed 45 km/h
has become ... 8000W speed 70km/h
Very nice! 8)
Please tell us more: Which motor, controller, battery etc?
by SlowCo
Dec 09, 2017 6:15 pm
Forum: E-Bike General Discussion
Topic: Rim stronger than the sunringle MTX39?
Replies: 14
Views: 333

Re: Rim stronger than the sunringle MTX39?

This carbon rim maybe ( :shock: )?:

by SlowCo
Dec 07, 2017 6:52 pm
Forum: E-Bike General Discussion
Topic: Electric handbike
Replies: 20
Views: 358

Re: Electric handbike

If he needs to be able to use the handbike manually without motor assist then you should choose the Q128 geared hub motor. The Q128H is the version for a freewheel gearset and the Q128C for a cassette.