Endless Sphere

Those motorcycle statistics are badly distorted by idiot riders, and that's whether they're riding like asses or simply riding in an insufficiently alert and defensive manner. I'll take riding at traffic speeds in a manner where my survival is up to me riding mistake-free over being a slow moving ob...

If you use regen braking, then torque arms that clamp onto the axle are the only acceptable type using anything above very modest power. All non-clamping types will eventually deform or worse, deform the axle, resulting in a loose fit and rocking motion of the axle in the dropout. Any exceptions req...

I find that the fun factor increase of running higher voltage for a given system far outweighs any detriment. 31s with the smallest wheel I could find with over 100 foot-pounds of torque with a pretty flat curve up through 80kph due to current limiting, and a top speed around 115kph depending on SOC...

I strongly recommend testing and matching used batteries before assembling a pack from them. A BMS can't fix or lengthen the life of a poor cell, and as previously mentioned one bad cell can quickly make a whole pack useless with or without a BMS. Building from used cells is fine, and it's even poss...

Water ingress is why I prefer hubbies with wires coming out of the axle instead of a channel for the wires between the axle and bearing. Then starting on the axle I wrap electrical tape in one continuous piece with a lot of overlap from the axle to 2-3" of the wire harness down the drip loop. I've r...

Ping batteries need to be left on the charger for a long time so the BMS can balance the pack. The charger will cycle on and off numerous times during the balancing stage as the BMS drains a little out of the highest voltage cells, so the low voltage cells can be brought up to full voltage. If you f...

What would happen if batteries with a voltage difference of 0.1v are paralleled? [/b] Nothing other than the batteries will eventually reach an identical voltage. I've done it many times with batteries up to a 1V difference. The voltage differential is so small that the current flow between them wi...

So in general, to maximize the system's power, pick the highest Kv you practically can. At some point you wont be able to fit the gearing to convert the power from high w, low T to a more useful low w, high T at the wheels You also need to consider the inefficiency of gearing. Real-world (suboptima...

DDDDDD, the CA doesn't have a shunt. It has wires that need to connect to both sides of the shunt. They're commonly connected to the shunt inside the controller, but that doesn't work if using 2 controllers (the topic of this thread), so a separate stand alone shunt is required through which the cur...

I find drivers are more courteous when I ride with a video camera prominently displayed on top of my helmet. YRMV, since drivers here are reasonably accommodating to those of us on two wheels. I'm actually more worried about being smacked by a motorcycle than a car. In 10 years of riding electric th...

A pair of direct drive wheelchair hubmotors is what you're looking for. Since most of those have worm gear drive, they'll hold fast when stopped, without back-driving the motor. That seems like a good virtue for the application. One drawback is they'll constrain the depth and width of the load bed ...

A pair of direct drive wheelchair hubmotors is what you're looking for.

Nice clean build. How's that suspended seat using a rear shock working out for you? I love the better handling of a hardtail and have long wanted to try a suspended seat using a method like you used.

Properly geared adequately powered ebikes have no need for multi-speed setups unless you have drastically different riding uses, eg normal riding as well as low speed mountain climbing or otherwise hauling big loads. My solution has always been more power on tap, but some day I'll build a retro-dire...

Cool bike. I'm with SolarEbike and don't understand the full length winding of the bamboo. Cured boo is strong and rigid, so I'd think it only needs reinforcement fiber and resin at the joints.

What else can I do to increase range or comfort? Buy a welding machine and start working on the next one with a longer wheelbase for better weight distribution and a lower riding position. Except on large bumps my hardtail semi-recumbent with a much lower and more forward riding position (and batte...

Too much phase current? Yep. I run much lower resistance (16mOhm phase to phase) higher efficiency motors at much higher peak power (28kw real peak input) and only run slightly higher phase current with 390A split between 2 controllers running a 19.25" OD wheel. The big wheel on your motor hurts to...

For "rough trail riding" you want a mid-drive rig (motor out of the wheel). About the only one I know who does serious offroad with a hubbie is MadRhino, but he's a veteran downhiller who doesn't mind the maintenance to keep it tuned and in good working order and is willing to open the pocketbook fo...

I got no use for this, wont fit behind the Strong GTS bike but the 20" just might of, as the rear dropout is like 160mm which I've always squeeze bolted them in. Winters coming so someone local will want it. Of the fat bikes I've seen down here I always thought the 20" fatties looked my cooler. Plu...

What's the big problem with using a PAS bike and avoiding trouble with the law? By and by, you probably will be able to use an e-bike with a throttle legally, but not today in NYC. That doesn't mean you can't use a legal e-bike instead. There's an easy way to be in the right when a cop hassles you:...

I rarely even install the axle nuts on my motors. Good clamping dropouts make axle nuts just decoration.

Lithium batteries will deliver far more current than their rating and they're more than willing to kill themselves doing it. The big hint is the large voltage drop under load which is cause directly by the internal resistance of the battery, which results in energy loss in the form of heat. Some of ...

The only problem is that the regen braking is actually taking a second to activate, making it really bad at sudden stops. Did you ever have this experience? Regen braking works best once you become accustomed to the speeds and distances in order to minimize the use of your mechanical brakes (and mi...

That gives you time to reconsider trying to make the most of your hubmotor. Once you consider the working radius of the hug amount of magnetic flux of an 80mm wide 273mm diameter motor that is capable of far more torque than any motor close to it's weight range after you subtract the wheel and drive...

I'm with AW, and you have the stator in backward, especially since wires typically come out the left side of the motor, so your chain can't tear up the wiring harness. It may not just be the covers swapped though, since the rotor could be backward too. It's quite common for the magnets to have more ...