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    Wire bonding

    Haven't been on here in a while and in the interim got into semiconductor fab which involves this cool tech called wire bonding! Usually the wires involved are very small but they can be bigger, big enough to carry current for high power ebikes. Wire bonding has been used in industry for...
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    Idle for X1 mid drive w/ RC controller?

    So this motor freewheels which means it stops turning when you close the throttle even if the bike is moving. Constantly having to startup the motor from a dead stop whenever I get on the throttle is not only annoying and sometimes hard on the drivetrain, it's probably also inefficient. And it...
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    Forget ebikes. E-unicycles are where it's at!!!!

    Apparently there is a bit of a learning curve for people who are not pro skaters or human-power unicyclists but these things are awesome. They've been around for several generations and are generally reliable. The power is great, the range is better than most ebikes. Cost for a good electric...
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    Electronic derailleurs

    OK I am years late to the party here but electronic derailleurs are the best thing ever for a mid drive that uses the bicycle drivetrain. I just put a d1x trail actuator on my bike and it is SWEET. Why? You can pick any number of gears to use, for example a fraction of the cassette. You can...
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    APD HV Pro

    Anyone use these speed controllers? Haven't seen anything on here. I was curious so I got one and will be trying the 20S whenever it gets here. Could be a great controller for low inductance high rpm RC style mid drives. Or maybe it will suck, who knows. For the price it had better be awesome...
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    The control dilemma

    What if a person wants to ride electric motorcycles, electric bicycles, and conventional motorcycles, with as few confusing control false-duplications as possible? The answer may be a rear thumb brake, as shown below. Other opinions or suggested configurations are most welcome. A false...
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    Great read on Pre-WWII electric submarines

    90% efficient motors, gigantic batteries and very low RPMs. Pretty good stuff. For a very long time submarines were the most advanced and invested-in electric vehicles. http://rnsubs.co.uk/dits-bits/br-3043/part-two/chapter-26.html
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    43 mph unicycle...who's faster?

    Every now and then I think it would be cool to get a powered unicycle but they are kind of sketchy if something goes wrong and you need to bail. Then tonight I see SUPERDELL of all people post a 43 mph unicycle ride. He used to have a pretty lengthy wikipedia page but it looks like he got it...
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    Expensive-ass 22S RC ESC

    https://www.jphobby.eu/en/controllers-esc/1692-jp-hobby-180a-hv-esc-6-22s-opto.html I am successfully running a Castle HV160 on 12S w/ my CYC X1 but need more power. CA v3 moderated Domino. Is the above controller legit? Good startup algorithm? Lots of power? Immediate response? Not very...
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    Lightning Motorcycles scams SA dealership owner

    Anyone following this? Pretty hilarious, since many of us have suspected Lightning as scammers for a while now. https://www.facebook.com/JacobusJvRensburg/posts/10219987769068102
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    Sevcon DriveWizard / motor commissioning

    I'm posting this in e-bike technical because some do use sevcons on ebike builds and this information may be relevant. If you own a Zero motorcycle the maintenance schedule calls for motor "recommissioning" at 600 miles, presumably because the magnets change initially after some heat cycles...
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    Sprag clutch vs freewheel

    So I got a fancy custom mid drive kit and the freewheel is actually a sprag clutch. This is freaking AMAZING. It doesn't make any noise when spinning free and locks up immediately when the torque comes. WHY are these not more popular? Why don't they use them in cassettes? Who the hell wants...
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    Ebike MTB racers, how fast are you?

    It's taken me a few years but compared to pro MTB riders on really difficult, technical trails avg under 15 mph I have gone from being WAY out on my times to within seconds of the all time records. The bike I've switched to is 50 lbs full suspension and only 750w. I have more powerful bikes but...
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    ASI BAC8000 on higher voltage

    Anyone get ASI working on <100V via fet and cap replacement? Presumably the voltage measuring device would need modified input. And either a firmware mod or rescale with phony voltage detection.
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    Zero SR

    I would like to get another street bike and don't want to deal with building it. So a new Zero SR seems to be one obvious choice. I might go ride one tomorrow. Talk me out of it. Here are some arguments I've already come up with for and against: Cons: --expensive. you can buy some pretty trick...
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    Are my expectations as a customer just too high?

    This dude / company will remain nameless since I think this whole situation is totally my fault for expecting a square transaction. Value of sale was a little over $600. Here are my main issues, timeline below. Am I being unreasonable? 1) I have to contact seller for everything. He won't send...
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    Sound system--how much power?

    For those of you who blast tunes while riding how much power is adequate and at what speed? I want to do 45+ while bathed in sound so was thinking around 500 watts with a 6" sub.
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    Riding with night vision

    The bare minimum for riding in low illumination areas is a single gen 3 autogated tube. Autogating means that bright lights won't damage your hardware or render it temporarily unusable. So this is very good for urban areas. These devices have been in production for about 20 years and they are...
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    Load cell brake lever

    Lots of load cell foot brakes on google for racing simulators. A load cell hand brake would be perfect for variable regen, so it's pressure not travel sensitive. I want this on my bike. Anything like this exist off the shelf before I make one?
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    No lag, instant response controller recommendations

    As an example, the Alta Redshift MXR or a Tesla does not have lag. Who has found a controller that is apparently lag free for a experienced rider? I'm talking completely instant response. My need is in the 6-15kw range. Sine wave is nice, foc too but not necessary.
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    Lightweight lithium battery for car

    Engine is a BMW N55. It takes under 150 amps to start. Was thinking of going with the 40152S cell in a 4S1P config with aluminum busbars and cable since aluminum has better conductivity to weight ratio than copper. That means due to the density of aluminum the physical size of the conductors is...
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    The black art of motorcycle dynamics

    So the subject is interesting: you have what seems to be a comprehensible system relying on "classical" physics that were iron-clad over 100 years ago. But then you find things like a wiki page lacking even basic information and universities web pages and books by physicists getting really basic...
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    Very high voltage in high output motors

    Some industrial electric motors operate in the kilovolt range, even above 10kv. These motors produce several MW of power, and are badass. EV trend in performance vehicles is to use higher voltages. Porsche, Koennigsegg use nearly 1kv. When a controller is involved, lower is generally better as...
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    Whatever happened to Lyen?

    So a few years ago Lyen's controllers were all the rage and got constant mention on these forums but he doesn't seem to have updated anything. I guess he still sells the trap wave controllers, but what happened? Did he get too good of a real job? Was he burned out on supporting ebikers with...
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    Which thermistor do I have?

    My new Leaf motor has a thermistor with about 550 ohms @ 60 degrees F and 971 ohms after a quick brisk ride which made the sides of the motor quite warm. These seem to be unusual values for a thermistor. What kind might I have?
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