Search found 961 matches

by flat tire
Jan 16 2019 7:26pm
Forum: General Discussion
Topic: Unicorn Motor Controller
Replies: 4
Views: 105

Re: Unicorn Motor Controller

You'll need more power than 1kw to drift a wheelchair unless you're on ice. Also, you'll need anti wheelie but I'm sure you've thought of that. There are plenty of big ass motors out there for cheap. I don't have specific recommendations, but you'll probably be better served using something other th...
by flat tire
Jan 16 2019 3:25pm
Forum: E-Bike General Discussion
Topic: Is pedaless ebikes illegal in NYC?
Replies: 6
Views: 232

Re: Is pedaless ebikes illegal in NYC?

My thoughts are that you should probably use conventional english in your thread titles or many people will discount interacting with you in any positive way out of hand.
by flat tire
Jan 15 2019 3:38am
Forum: General Discussion
Topic: Telescope design; eliminating mirror-support diffraction
Replies: 11
Views: 296

Re: Telescope design; eliminating mirror-support diffraction

You would have to do the math but to eliminate arms and have a meaningful aperture between the smaller mirror and its magnetic support would probably require a superconducting electromagnet.
by flat tire
Jan 14 2019 4:36pm
Forum: Battery Technology
Topic: Losing Lipo cells
Replies: 6
Views: 207

Re: Loosing Lipo cells

Archers, loose arrows! Err, lipo cells! That's a joke, because you used the wrong word. "Loose" is what happens to your wife after she gives birth and it's also a verb meaning "release" typically used in the context of archery. The word you're looking for is "lose" which means to be deprived of some...
by flat tire
Jan 11 2019 7:10pm
Forum: E-Bike Non-hub Motor Drives
Topic: Why 750w costs less than 1000w BBSHD?
Replies: 11
Views: 420

Re: Why 750w costs less than 1000w BBSHD?

Price targeting, it's a strategy to make more money than if you sold everything at one price.
by flat tire
Jan 11 2019 7:06pm
Forum: E-Bike Technical
Topic: Waterproof wire nuts vs soldering connections
Replies: 10
Views: 255

Re: Waterproof wire nuts vs soldering connections

Wire nuts are a no no. If you're worried about soldering adding a lot of time, go to the hardware store and get some butt crimps. Then you can securely and permanently join wires in a way that's just as easy as wire nuts.
by flat tire
Jan 09 2019 4:41pm
Forum: E-Bike General Discussion
Topic: 40-50 mph 75 mile range
Replies: 50
Views: 1315

Re: 40-50 mph 75 mile range

Stickers won't throw off the authorities, slowing down when they're around and pretending to pedal so you don't get hassled in the first place will. It sounds like you don't have the budget to do what you want in any practical fashion. Try the cheapest 1000W hub motor kit you can find with a 1KW bat...
by flat tire
Jan 09 2019 4:27pm
Forum: E-Bike General Discussion
Topic: 40-50 mph 75 mile range
Replies: 50
Views: 1315

Re: 40-50 mph 75 mile range

I wouldn't run any hub motor over a few KW in anything but a custom swingarm. Easy enough to get one made, simple job for a fabricator / welder. I say this as someone who loves high power ebikes. For a relaxed body position and average speed of 45 mph on a mountain bike you'll need something like 6k...
by flat tire
Jan 04 2019 4:57pm
Forum: E-Bike Technical
Topic: QS 273 hub motor part/mounting question
Replies: 2
Views: 107

Re: QS 273 hub motor part/mounting question

Torque arm. I made a custom reinforced swingarm with heavy slots to receive the axle so I ditched them. You shouldn't be running a QS273 in bicycle dropouts anyway, torque arms or not.
by flat tire
Jan 02 2019 1:26am
Forum: E-Bike General Discussion
Topic: Bigger tire in front?
Replies: 19
Views: 428

Re: Bigger tire in front?

I've got 26" 2.3 Nevegal Elite on my downhill 4kw right now F/R. Unless you are regularly on the edge of traction it really doesn't matter what size you have or whether they're fat, skinny, hard, soft, etc. Now some human-power MTBers like a smaller tire on the rear because they think they can slide...
by flat tire
Jan 02 2019 1:10am
Forum: Battery Technology
Topic: Need Advice on BMS System
Replies: 10
Views: 347

Re: Need Advice on BMS System

How do you monitor that you dont discharge the cells lower than 3.7 whilst using them ?? There are a few ways. After you get experienced you'll be able to get a general idea of how much energy a given ride will take and plan accordingly. To make sure the entire pack doesn't go below a given voltage...
by flat tire
Jan 01 2019 7:28pm
Forum: Battery Technology
Topic: Need Advice on BMS System
Replies: 10
Views: 347

Re: Need Advice on BMS System

Can't recommend one as I balance my lipos manually and they last months and a shitton of cycles before needing attention. I run 4.08 charge and discharge to around 3.7. Not discharging too far is the main thing that will keep your batteries balanced, and the margin from full charge serves to give yo...
by flat tire
Dec 31 2018 4:15pm
Forum: E-Bike Technical
Topic: Sabvoton Throttle Sensitivity
Replies: 12
Views: 322

Re: Sabvoton Throttle Sensitivity

I have used a bunch of cheaper controllers with horrible throttle. The only fix I found was to go to ASI with a calibrated domino throttle, using torque request mode and minimum ramp time. The throttle on that setup is heavenly. INSTANT response but totally controllable. I don't have any of the prob...
by flat tire
Dec 31 2018 3:53pm
Forum: Electric Aircraft
Topic: another e plane upstart
Replies: 12
Views: 296

Re: another e plane upstart

Continuous and max power ratings being what they are I wouldn't be too surprised if they are planning on a "emergency power" feature so the thing can climb with just the rear motor for a short period if there's trouble on takeoff, or maintain altitude for a while if there's a problem in flight. I'll...
by flat tire
Dec 28 2018 4:02pm
Forum: E-Bike Technical
Topic: High power controllers
Replies: 3
Views: 185

Re: High power controllers

2000 watts is very low power. You can't go wrong with a Phase Runner.
by flat tire
Dec 21 2018 6:09pm
Forum: Battery Technology
Topic: Samsung 35E vs 30Q Cycle Life
Replies: 23
Views: 923

Re: Samsung 35E vs 30Q Cycle Life

You can vastly increase the cycle life not only by drawing less current than rated but also by charging and discharging below and above the ratings, respectively. Obviously you get less energy out of the battery this way, but it should last much longer than if you draw the nominal Ah each time for c...
by flat tire
Dec 17 2018 3:45pm
Forum: General Discussion
Topic: Know Anything about 'Openresty?'
Replies: 6
Views: 296

Re: Know Anything about 'Openresty?'

Someone put software on their webserver but didn't configure it and when you tried to browse to some site or other (or got redirected there) you saw that message. It has nothing to do with you.

You can google that software for more info.
by flat tire
Dec 15 2018 2:39pm
Forum: E-Bike General Discussion
Topic: eBike mod ideas
Replies: 19
Views: 857

Re: eBike mod ideas

You don't need to do anything exotic like cool your motor. Just buy something big enough. Even something like a 1.5kw nominal motor could probably take your use all day. 1KW if it's cold. You can also look into a mid drive if you want more of a install and maintenance challenge. The advantage of a m...
by flat tire
Dec 13 2018 1:31pm
Forum: E-Bike General Discussion
Topic: Where are the hq geared hub motors?
Replies: 20
Views: 776

Re: Where are the hq geared hub motors?

Because hub motors in general suck due to adding mass in the worst possible place and it's not worth making expensive high end geared hubs. It would be too much of a niche product and by the time you get around making everything decent quality and in low volume it will cost over twice as much. Basic...
by flat tire
Dec 13 2018 1:28pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Electric Buell racebike build
Replies: 22
Views: 2848

Re: Electric Buell racebike build

Great work. Subscribed to thread. Where did you get the Zero motor?
by flat tire
Dec 13 2018 1:19pm
Forum: Battery Technology
Topic: My first diy battery pack, need helps!
Replies: 9
Views: 391

Re: My first diy battery pack, need helps!

Those welders are kind of worthless, and with pure nickel you'll have to use the electrodes directly on the body of the welder or make your own extensions. The extension cables on mine were copper plated aluminum. I ended up throwing that welder away and had better luck with a lipo powered one made ...
by flat tire
Dec 13 2018 1:15pm
Forum: E-Bike Non-hub Motor Drives
Topic: quick bbs02v2 question: 16 awg power wires ?
Replies: 3
Views: 203

Re: quick bbs02v2 question: 16 awg power wires ?

You already know the battery voltage and nominal current. You can look up the resistance of a segment 16ga wire on google which is a function of conductor (probably copper) and the length. Then a calculator for "power dissipation in resistors" can show the answer in a couple clicks. You're probably ...
by flat tire
Dec 11 2018 1:53pm
Forum: General Discussion
Topic: Discussion on counterfeits
Replies: 6
Views: 350

Re: Discussion on counterfeits

Common business practice in China. Unless you have good reason to believe your products aren't in this category, you should probably assume they are even if full price and certainly if the price is too good to be true. Using paypal and buying from reputable sellers who other people vouch for is one ...
by flat tire
Nov 29 2018 12:47am
Forum: E-Bike Non-hub Motor Drives
Topic: new cyclone 3000 w mid-drive kit?
Replies: 3096
Views: 303773

Re: new cyclone 3000 w mid-drive kit?

72v is easier on the heat in the motor and the chain. For 40mph, you only need about 2000w. Anything can do that. Explain. Torque (phase amps) and torque ramp will determine mechanical impact on drivetrain. Strain on the motor itself depends on power input and efficiency. This motor is not good for...