ch00f

Snoot isn't all it's gonna be dropping.

Interesting point. Did some napkin math on that:

If a 100kg person + bike was going 50kph and came to a stop in 5 seconds, the average power generated would be 2kW.

I consider that to be a fairly extreme circumstance and requires 100% efficiency. A typical e-bike battery is around 500Wh, so that's a 4C charging rate which isn't really that extreme especially if it's only maintained for a few seconds.

Now in a more sustained situation, it might be helpful. If you're trying to maintain a comfortable 30kph while descending a 45% grade, that's a continuous 4kW that needs to be shed. I suspect a lot of it would go to wind resistance, but if 100% of it went into your battery, a standard lithium pack may struggle to keep up.

So maybe it'd help in extremely hilly situations, but I'd still like to know what it weighs. Supercap specific energy per wikipedia is around 90Wh/kg vs 270Wh/kg for lithium ion. So a cap weighing the same as a 500Wh e-bike battery would have a capacity of around 160Wh.

In the above descending example, it would be fully charged in 2.4 minutes.

So I guess it depends on the scenario.

The other thing to consider is comfort. It's generally more comfortable to coast to a stop on a bike (burn off energy to wind resistance), and assuming the bike has conventional brakes, I wonder what it would feel like switching from regen to friction braking.

I think efficiency would be about the same between caps and batteries. The issue is that both are heavy. Capacitors moreso for the same capacity though this application isn't looking for a long-haul energy storage solution.

Storage Batteries Stationary and Portable by J.T. Niblett, M. I. E. E. Copyright 1911/1912.

Looks like Archive's got it: https://archive.org/details/storage_batteries_1912/page/n3/mode/2up

Interesting idea in theory, but probably less so in practice. Regenerative braking rarely makes sense on bikes. Humans and bikes just don't weigh enough to hold a lot of kinetic energy, and few bikeable hills are tall enough and steep enough to require continuous braking. Unless the grade is really intense, I'd rather just coast at a fun 30mph.

Where's the button to swing your U-lock?

Surprised by this. Most advertising magnets are some kind of plastic/rubber imbued with magnetic particles. Wondering if this has more to do with moisture trapped under the magnets.

Edit: Looking at the photos this doesn't look like rust or corrosion. It looks more like his Temu magnets leached some crap on his car.

/r/youdonthop

Fun to remember that Mr. Toad was a parody of all the dicks who drove cars.

From a 110 year old book I picked up recently:

Is DDWRT still a thing?

haha so true!