Search found 13696 matches

by John in CR
Jan 16, 2018 12:06 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW
Replies: 126
Views: 11146

Re: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW

I only got to 172kph, but that was at about 700m (not a mile) where I let off the throttle due to what appeared to be something on the road, so it had a bit more to give. I had already ridden a couple of miles to get to the start point, so voltage was down a bit and motor wasn't cold. I'm hoping my ...
by John in CR
Jan 15, 2018 11:48 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: R Martin Moped build
Replies: 6
Views: 71

Re: R Martin Moped build

That scooter already has the best hubmotor on the planet on it as long as you don't run a pig heavy scooter with it. If you can Keep the all up load at say 400lbs or less and run the smallest 13" tire you can fit, then you'll be on your way to something special.
by John in CR
Jan 15, 2018 1:24 am
Forum: Motor Technology
Topic: Mid drive vs Hub Motor for 10000 watt project
Replies: 57
Views: 1088

Re: Mid drive vs Hub Motor for 10000 watt project

I balance my hubbies quite simply using trial and error. I've used thick solder wrapped around spokes, extra long bolts using washers as the weights for bolt-on rims, as well as stick-on lead weights for car wheel balancing. It just depends on the wheel and how much out of balance it is for which me...
by John in CR
Jan 13, 2018 8:17 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Apollo 250 Dirt Bike Conversion
Replies: 134
Views: 6878

Re: Apollo 250 Dirt Bike Conversion

Coming along nicely. Looks like a fun little bike...fun enough that you'll want more riding time, so start thinking about placement for more battery. Your battery pack will thank you too, since the lower the current draw per cell and shallower the typical DOD, the longer batteries live. My shop budd...
by John in CR
Jan 11, 2018 10:11 pm
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw rated $587
Replies: 418
Views: 52138

Re: Hubmonster 94% efficient 7kw rated $587

There has got to be motors out there in production that are similar. No unfortunately because the guy who designed them holds the Chinese and international patents, and while they don't respect international patents, they do respect Chinese patents. He's on to high price stuff, bigger motors for ca...
by John in CR
Jan 11, 2018 10:06 pm
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw rated $587
Replies: 418
Views: 52138

Re: Hubmonster 94% efficient 7kw rated $587

I hope I'm not hijacking or in some other way intruding this topic, but I've seen somebody was searching such hub some time ago. I've hubmonster for sale. You can find it here: https://endless-sphere.com/forums/viewtopic.php?f=9&t=92322 Sorry but you don't have a HubMonster and no 205x55 hubmotor e...
by John in CR
Jan 10, 2018 10:48 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW
Replies: 126
Views: 11146

Re: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW

Maybe I have to explain: The 2.5 tire is for the 3.5 front rim. The hubmotor has a 4.5 rim where the the "little" 4.5 Hoosier is already installed. I also know that for drag racing my 160/60-17 tire will be a better option! But regarding the design I really like the fat tire at rear wheel (hubmotor...
by John in CR
Jan 10, 2018 3:47 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW
Replies: 126
Views: 11146

Re: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW

madin88 wrote:
Jan 09, 2018 2:12 pm
Installing a smaller tire makes a lot of sense for drag racing :)
+1 For optimum performance a smaller wheel accompanying higher voltage always wins.
by John in CR
Jan 08, 2018 7:52 am
Forum: Motor Technology
Topic: What limits the no-load speed of a motor.
Replies: 6
Views: 108

Re: What limits the no-load speed of a motor.

Heat is always our motors' limiting factor. Power is torque X rpm. Current creates torque and the heat from current is primarily from copper losses, which is resistance X current squared. Heat is also created on the rpm side in the form of iron core losses. The alternating magnet field creates heat ...
by John in CR
Jan 08, 2018 7:18 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: KTM Freeride e-xc battery voltage?
Replies: 13
Views: 215

Re: KTM Freeride e-xc battery voltage?

KTM like all the makers of smoke belching vehicles builds their electrics making choices that protect their primary business line. That means simple and cheap are out of the question, which rules out lower voltages especially when the high voltage keeps the general public more scared of electric. Pl...
by John in CR
Jan 04, 2018 5:48 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Mid-mount Hubmonster Madass
Replies: 51
Views: 6545

Re: Mid-mount Hubmonster Madass

... edit just saw your new frame guess you wont be using stock motor mounts. Actually my motor mount is almost 100% stock. It took just a minute or two with a file to slide my previously modded axle HubMonster onto the Sachs swingarm. :mrgreen: It's the closest to stock motor mount I've ever been a...
by John in CR
Jan 04, 2018 1:24 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Mid-mount Hubmonster Madass
Replies: 51
Views: 6545

Re: Mid-mount Hubmonster Madass

Field weakening is something that doesn't effect your lower motor speed operation at all, it's something that only begins to take effect after your motors at an RPM where the BEMF it's generating starts to equal your battery pack voltage. At that point normally your torque would begin to fall off q...
by John in CR
Jan 04, 2018 12:19 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Mid-mount Hubmonster Madass
Replies: 51
Views: 6545

Re: Mid-mount Hubmonster Madass

Unfortunately you are using a hub motor so gearing is not an option. Your hub delivers the RPM's and torque it does until it runs out of KV's. A mid drive with a modded Peerless 700 transmission will give you both...speed and torque and do it for cheap. Shifter kart racers use this little transmiss...
by John in CR
Jan 01, 2018 6:43 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Mid-mount Hubmonster Madass
Replies: 51
Views: 6545

Re: Mid-mount Hubmonster Madass

Chalo, It won't get pink paint, and my helmet definitely won't be a cat, so I don't think your definition of "cute" will apply. It already looks much better than any of the pics I too portrayed, but in addition to the paint job, a huge hurdle in the looks department IMO is how I integrate a place to...
by John in CR
Dec 30, 2017 10:46 pm
Forum: E-Bike Technical
Topic: Do you recognize this hall sensor?
Replies: 5
Views: 187

Re: Do you recognize this hall sensor?

4 of 6 halls dead. Seems doubtful. Have you properly tested them? There's probably a Wiki on how to do it. I simply use an enbike tester, since I prefer the easy way and try to avoid opening motors unless I'm doing significant upgrades. If you don't have an ebike tester, get one.
by John in CR
Dec 30, 2017 6:21 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Mid-mount Hubmonster Madass
Replies: 51
Views: 6545

Re: Mid-mount Hubmonster Madass

I realized I couldn't get things to fit right and decided not to hack it up. Instead I built a frame from scratch, though not a MadAss replica. I do have a replica with larger dimensions for batteries in process too, though that's a few weeks away. A testament to your skills when designing a new fr...
by John in CR
Dec 30, 2017 8:59 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Mid-mount Hubmonster Madass
Replies: 51
Views: 6545

Re: Mid-mount Hubmonster Madass

What about the empty gas tank? There is room in there for something? I'm cutting mine in about half lengthwise,... Seems like a crying shame. If you cut through the tube at the back/bottom end just in front of the dome, you could slide 7 groups of 13 18650s inside and hinge the dome back on; and ke...
by John in CR
Dec 16, 2017 3:35 am
Forum: E-Bike Photos & Video
Topic: Chalo's cargo bike with BBS02
Replies: 18
Views: 750

Re: Chalo's cargo bike with BBS02

How does it handle with a heavy load in the cargo box?

What kind of cargo bike configuration would you suggest for quite heavy and often long loads? Cheap and easy are always part of my equation.
by John in CR
Dec 15, 2017 10:34 pm
Forum: Battery Technology
Topic: Do batteries "waste away" if not used?
Replies: 6
Views: 392

Re: Do batteries "waste away" if not used?

2-3 years is typical, for an e bike battery that is used and stored in the real world. Dan, you need to start using better batteries. I fully expect to get 10 years of regular vehicle service out of all of my automotive grade lithium batteries, and then after capacity has degraded they'll go into s...
by John in CR
Dec 14, 2017 12:01 am
Forum: Resources & EV Related Parts and Services
Topic: Duyunov wheel-hub motor
Replies: 12
Views: 636

Re: Duyunov wheel-hub motor

I am interest in becoming a distributor for Central America. I want purchase some of your motor wheels for testing before prepaying a bulk order. We now use hubmotors with 93%-95% peak efficiency, but they became to expensive to produce. If your motor design is as good or better, my associate and I ...
by John in CR
Dec 13, 2017 11:03 pm
Forum: Items for Sale - New
Topic: Carbon frame and fork for Bafang Max Drive System
Replies: 4
Views: 562

Re: Carbon frame and fork for Bafang Max Drive System

crossbreak wrote:
Dec 10, 2017 12:52 pm
price?
As I was starting to get pissed off for wasting my time with no price, I found it in the second post. $545 frame and add $125 if you want the carbon fork.
by John in CR
Dec 11, 2017 10:47 pm
Forum: E-Bike General Discussion
Topic: Electric Cargo-bike POWER system for steep terrain?
Replies: 38
Views: 1932

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

My suggestion would be to run a 1000W hubmotor as a mid-drive, but not StokeMonkey style. Instead run a belt-drive direct to the rear wheel with the appropriate reduction. That is because for every uphill there is the same downhill on any round trip, and regen is important for minimum maintenance an...
by John in CR
Dec 10, 2017 7:17 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Dashboard suggestions
Replies: 9
Views: 349

Re: Dashboard suggestions

Unless you're going to have advanced BMS info displayed I like the original...nice and simple, especially for a dirtbike. Why introduce lots more points of failure with no real benefit?
by John in CR
Dec 08, 2017 3:13 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 13kw mobility scooter
Replies: 2
Views: 384

Re: 13kw mobility scooter

May all of his roads be flat and straight. I may ride some crazy stuff with similar performance and more, but someone would have to pay me to ride that thing. With those tiny wheels on front, how can the steering not be tremendously sensitive? It's nothing like having the width or low CG of a go-kart.
by John in CR
Dec 05, 2017 5:00 am
Forum: Motor Technology
Topic: cheap -high power motor combination
Replies: 3
Views: 371

Re: cheap -high power motor combination

19kw input would burn up both the motor and controller you listed in short order. FWIW, Kelly lists what they call "motor current", which is phase current. A common mistake on the forum is to multiply phase current times voltage to come up with power in watts, which isn't a valid number. To make mat...