Recent content by mschwett

that’s what i get for stopping at “the last 25 years” lol!! gemini says canyon has 32, they probably weren’t even around in 2010?

you’d think so … but ……. (and certainly not to keep a bunch of cyclists dry 😂 ) it’s actually sorta a serious problem though. many cities are reluctant to invest too much or compromise other modes for cycling infrastructure because they can’t reduce capacity of other systems, since when it...

sure, but overhead power lines are skinny and high up and generally not in a line between the fire lane and the first 75’ of the building that’s on fire! there’s a reason they don’t put those things 10-15’ above the ground, which is where a roof would have to be to effective at in keeping a bike...

https://sicycle.wordpress.com/2016/02/07/the-top-25-most-stage-winning-bicycle-manufacturers-of-the-last-25-years/ tour stage wins by mfr!

fun idea. bike lanes are usually next to curbs/sidewalks tho, which means they’re in the area firefighters use for their trucks and ladders and so on. typically not allowed to have continuous obstructions there.

i’m positive that it’s output - or at least an estimate thereof. the math aligns very closely with predicted speed and power requirements going up steep hills slowly, which is really all about gravity and weight. the documentation on the system also specifically mentions a motor torque sensor -...

important distinction - 10 MPH, not 6. 6% grade. i don't know yet what it'll be at 6mph (which is more like a 10% grade, coincidentally) since i didn't get good battery values for that first test. one interesting thing about the mahle data is that the WH capacity doesn't seem to go up if the...

here's an example with efficiency. i am missing a little motor power data at the end due to user error (the chart is a little shorter in time than the math), but no reason to believe the relationship between speed and power would suddenly change. red line is motor power. blue line is speed...

yep, that’s a good method if the bike goes by itself! if you need to pedal also, then of course you need to know how much work the rider is doing. without a watt meter, i wonder how accurate the SOC estimates from these things are…

i was surprised to see (after you pointed both of them out to me) that bikecalculator seemed to diverge from gribble, but the real issue is just not knowing all the values they use for the drop downs. some of the CdA values are higher than i would have guessed but not unreasonable. my own...

you just keep pulling out numbers without easy reference. 40% is crazy for loss, EIA estimates five percent. https://www.eia.gov/tools/faqs/faq.php?id=105&t=3 got a better, authoritative source? even if it was 40%, the total number for every passenger car mile driven is not even half of the...

you need a real ID or passport DOD ID card or a handful of other rare types. basically a real ID or passport. don’t bring any weapons. you can’t check really large batteries in, they have to be with you and removable. liquids need to be in small containers. they’ll ask you to take off your...

right, the question is are these small hub motors geared internally in a way to be efficient at, say, 6mph - which is around 75 rpm here. i assume it’s internally at least 5:1 on a motor this small so the range we’re asking it to be efficient in is roughly 350 to 1,150 RPM.

take a look at the ourworldindata link. the numbers aren’t quite that extreme, and it seems a well documented source. i agree that aviation, marine, and other industrial uses are going to be difficult. other transport is relatively easy as is electricity for general purposes.

more questionable numbers. here are the real ones 3.2 trillion miles driven in the USA per year. this figure is widely available. a good electric car can be expected to get about 4 miles per kwh in the near future. many already do better than that, some worse. assume 10% energy loss (DC fast...