Endless Sphere

Was this really just an excuse to say "leftist" a lot? Your concern seems misplaced since they caught their flight out of Tehran many weeks ago. I'm going to give Justin and An-So credit for probably making a reasonable evaluation of the risks involved in the trip. I seem to recall some mention abou...

This page suggests that 4 gauge may be OK. Me thinks we need someone with practical experience at these power levels. And that sure ain't me.

https://www.evdrives.com/category_s/4021.htm

Is operating at a higher voltage an option?

Seems like an extrapolation of what TrackR was trying to do. My brief experience with TrackR was that there was clearly insufficient density in the Phoenix metro area for "crowd GPS" to be effective.

Even the early Tesla Car that I saw the chassis of was made this way, it had no welding , all done with Lugs and Tubes / Metal, that was bonded together. When a car that goes over 100 mph can do this , a bicycle can surly be made this way as well. My Trek 1400 (early 90s) is still doing fine with i...

APL wrote: ↑

Aug 15, 2018 2:35 pm

Let me know if I'm boring too to tears...

Not even close. If anything, I wouldn't mind seeing more detail for some of the assemblies and processes.

Your new FETs may be more authentic than the ones that were already there. Compare them closely, the fakes usually have signs of copying. Comparing side by side to the real thing is often revealing, especially with an inspection microscope (low power stereo). Of course not everything is fake. So I ...

I suspect that in the U.S. the typical ratios are greater and the typical speeds travelled are higher. We may need to derive perhaps an R400 standard where the ratio is 1:4 and the typical speed is around 20 mph. When they do that, they'll probably find that they end up very close to 20 wh/mi which...

I squared R losses almost certainly exceed switching losses. Mostly over my head. But I think you are saying that any loss of speed in the switching would be of little consequence. Perhaps so. But it was hard to see the any clear benefit from the other options I could find. They buy "barely good en...

The motor in that kit look very much like the motor I bought from a similar kind of kit on ebay. Mine behaves very much like the 9C 2706 motor as modeled on the Grin Motor Simulator. If you are concerned about using a lot of power and possibly overheating this motor, you can give yourself a bit of a...

MOSFETs arrived today.

There are front hub systems with PAS, but the ones I know of are RPM-sensor, which IMO isn't bad since I have one that operates that way. FME it's possible to find a level of assist that makes you pedal with some force. There are much more knowledgeable individuals here; hope they chime in. Also, m...

Interesting, and a good idea. But I don't think it will be particularly relevant in the U.S. given the 1:2 rider to motor power ratio that they are using and the typical 25 kph speed cap employed. I suspect that in the U.S. the typical ratios are greater and the typical speeds travelled are higher. ...

Ironic too Wturbur, that your bike in your signature is totally illegal! Maybe not depending on where you live, but unless you have a throttle that won't engage unless pedaling, a speedometer, and have a hard cut off at 28mph, why then probably you're a scofflaw too! :D I updated it all prior to th...

And cars in my area typically drive 10 to 30 miles over the speed limit with the mass to crush and maim anything fleshy in their path.... it's hard to see the big stink about going 7 miles an hour over the bike limit in a road full of cars. In my 40 years driving I've observed that 5-10 mph over is...

The more your ride the easier it will be to use your legs to absorbs shocks. You'll build up a bit more leg strength and find it easier to lift that little extra bit to provide that cushion. That's assuming that you are putting in some moderate amount of pedal work right now. Another thing you might...

100 years ago you would be arrested for having a drink.. And that changed. And to be more precise, it reverted back to what it had been for ... well ... pretty much forever. 50 years ago you would get arrested for using the wrong water fountain. That changed too. That one's more complicated, but it...

<snip> *medium speed and distance is 35mph and 15 miles each way. That's only 7 miles an hour over the 28 mph stock bikes can go in my state, but it makes a huge difference in staying in the bubble between cars. Regulations will catch up with reality eventually. If history is an indication, then re...

Anyone still carrying on the idea that aluminum or carbon fiber cannot withstand abuse needs to watch this. 8) I think that sorta misses the core cause of the myth. That myth centers around the fact that unlike steel, aluminum has no fatigue limit. So the (misplaced) concern is that the aluminum bi...

The best FS bikes ever made are alu. You know, those riding 60 mph on rough downhill and taking drops the height of a house. Now they are carbon. Older, overbuilt Dh racing bikes can be found cheap during the winter. Then you will wish for 10+ kw. It seems like he's bought into the "all aluminum fr...

If I were to do conversions, I might consider upgrading existing bikes with 250 or 350 watt (based on controller wattage) Class 1 and 2 kits. But I probably would not convert existing bikes that would motor someone up to close to 30 mph. And conversions to existing bikes would have to go through a t...

If you are asking here and don't have a clear idea what your business model would be, then it probably isn't a very viable business for you right now. You need to be out in front of most of our thinking... That said, I think there are opportunities in e-bikes. But I wouldn't recommend it to anybody ...

Wow. 1.5 meters!! We only get three feet by law here in Arizona.

Looks like the BMS on my 20 10S "Hoverboard" packs. I know the guy who sold those packs also was selling some of the BMS's from some of the packs that were apparently disassembled. If it is the same board, then they do not balance. The shut down for over and under current and apparently if some of t...

Slime is gross. It keeps you from putting air into the tire, or letting it out. It turns into cat hairballs in green gravy as you ride. It makes simple punctures almost unpatchable. For most of us, it's not easier than carrying a spare tube, patch kit, and pump and knowing how to use them. I wouldn...