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  1. wturber

    38% of cars sold in China are now electric, Sinopec says the ICE is doomed

    Cite your source please. But even if you are correct, you need to discount the MPGe by at least 40% using your own figures. Well, that's a statement you make. But you haven't shown the evidence. In fact, the evidence you have shown suggests less than 2x as efficient using your apples to apples...
  2. wturber

    38% of cars sold in China are now electric, Sinopec says the ICE is doomed

    MPGe does not include conversion and transmission losses. If your estimates of such losses you gave earlier are correct, then the advantage is about 1/2 of 3.5 or 1.75 times as efficient. That also seems to roughly jibe with the energy cost to the user. So maybe regulatory and subsidy issues add...
  3. wturber

    38% of cars sold in China are now electric, Sinopec says the ICE is doomed

    I would classify the car as ICE or EV based on where it gets its energy. If it gets it from the pump like a Prius does, it is an ICE. If it gets it from a charging station it is an EV. The lines get blurred with the plug-in hybrids that source their energy from external electrical sources. I...
  4. wturber

    38% of cars sold in China are now electric, Sinopec says the ICE is doomed

    One problem with cost comparisons is that you don't know the degree of subsidy or tax at the various stages of energy production. So it is a perfectly practical way to be guided on what to purchase (tho estimating future trends puts some wrinkles in that), but it is only somewhat related to...
  5. wturber

    Bafang BBSHD and gear system for fast commuter bike

    I suggest scanning the file with different tools. I'd also check with whomever it is that publishes the file and get an explanation from them. Given how uncommon and niche the file you are talkin about is, I'd bet this is a false positive. That said, it is good to be careful.
  6. wturber

    Why don't you pedal your ebike?

    Not free. Just previously paid for. Also, that person doesn't have to be overweight. Even people with "normal" BMIs can have a lot of fat on board ready to be burned. For instance one calculator give a person at my height of 5'10" a range of 130-170 lbs as being normal. And as it is, I...
  7. wturber

    Why don't you pedal your ebike?

    True. But that means the person had to previously consume the food and calories in order to have the fat on hand (or belly) to burn. So the points @neptronix made about calorie consumption, energy efficiency and cost of calories remain.
  8. wturber

    Why don't you pedal your ebike?

    Many good points, but I get my extra calories on regular bike rides mostly from relatively inexpensive carbohydrate foods. I don't spend anywhere near $4 for my extra 1000-2000 calories - mostly generic fig bars and sugar added to tea. I also consider that a certain degree of physical exercise...
  9. wturber

    Your Creation's Before & After Pics

    I posted more info about this bike a few months back when I completed it. Figured I'd add it to this before and after build for grins. Too bad I don't have a photo of the Trek 820 by itself. The nice folks at xtracycle dug up as many original decals as they could find and that helped me with...
  10. wturber

    Cycle Analyst V3 preview and first beta release

    I'm running 3.15. I believe that is the latest stable version, but I'm not certain. It is certainly working fine for me though. But if you run the Grin software, that should tell you for certain. The Grin page says 3.14. But that page hasn't been updated since March of 2023. So I think it is...
  11. wturber

    Aero mudguards. Yes they look gastly but they do work.

    Whatever spins yer spurs I guess. But I don't race bicycles. I ride them for pleasure, utility and for exercise and fitness. So small gains in aerodynamics don't matter much to me. I'm riding an old Trek 770 road bike. It has a moderately modern 9 speed rear wheel that just barely works with the...
  12. wturber

    Aero mudguards. Yes they look gastly but they do work.

    Right. That's surely the key reason that the benefit seems to come from having the top portion of the wheel covered. Drag increasing with the square (or is it cube?) of speed, 2x can really matter.
  13. wturber

    Aero mudguards. Yes they look gastly but they do work.

    Nothing new here really. https://bikerumor.com/null-winds-aerodefender-carbon-aero-fenders-slice-headwinds-faster-than-aero-wheels/ Here's an abstract from the technical paper. There was apparently no actual physical test. This was all done using computer modeling...
  14. wturber

    E-bike powered by disposable vapes

    The guy who made the video requested and received a data sheet on them. That sheet said that the cells could be recharged not less than 300 times. I've seen other 20400 cells claiming 500 cycles. I wonder whether all of the batteries used were from the same maker or not. Seems unlikely that...
  15. wturber

    E-bike powered by disposable vapes

    Wildly unsafe? That seems a bit harsh. I'm pretty sure that the cells he's using don't have the safety mechanisms common with modern 18650 cells. So I certainly don't think this is a "safe" implementation. But he at least did a decent job of building the battery with an appropriate BMS...
  16. wturber

    E-bike powered by disposable vapes

    I have two destroyed "hoverboard" batteries (10s2P) that I'm having a hard time disposing of because the casing on some cells has been breached. And I live in a large metro area. I'll probably end up having to disassemble the battery so that I can drop the intact cells off for recycling. And the...
  17. wturber

    Cheap Charger Now Sending Overcurrent

    So, once again I find a battery not charging. So I plug the charger into a second battery and watch the charge LED go on Red and then change to Green. Crap. I'm blowing fuses in the battery again?!? Yep. Charger now outputting 8amps. Sigh. So I open up the charger and spin the VR1 pot...
  18. wturber

    Please help me understand this in the motor sim tool

    My limited experience with my two ebikes is that for most general use purposes the practical differences between different system efficiencies are dwarfed by differences in how the bikes are used. If you are doing long distance touring or are in some situation where every watt/hour really does...
  19. wturber

    Hill Climbing Assistance

    OK. My suggestion is to build an ebike for the purpose of you commuting and use your other two bikes for recreational rides and/or for the occasional hard effort commute. Why? 1) I think the friction drives are very likely to be unsatisfactory. 2) Any converted ebike is going to have some...
  20. wturber

    Left Drive Rear Hub Sprocket Dilemmas

    Yes. I used the "ACS SouthPaw" on my Stoke Monkey setup. You'll need to find a hub with the reverse threads, or find a way to adapt a right side Bottom Bracket bearing cup (or is it left side - I forget - one or the other) to the left side of the hub. Mounting a BB bearing cup to a disc brake...
  21. wturber

    Where do I meet my future ebike nerd wife?

    Retired. I mostly play table tennis, ride bikes, work on bikes and have fun with 3D printing (retired 3D animator). My wife of 25 years and partner of over 35 years doesn't bike at all. Though she does play table tennis. The hills make recreational riding moderately challenging and a real pain...
  22. wturber

    Where do I meet my future ebike nerd wife?

    Fortunately the issue isn't at all binary as you seem to suggest. Finding someone who shares your bike or ebike enthusiasm should, IMO, be less of a priority than just making sure to find a someone that enjoys physical activity a lot as well. @neptronix 's outline about compatibility and traits...
  23. wturber

    Hill Climbing Assistance

    I buy from them as well and agree with Chalo's assessment.
  24. wturber

    Hill Climbing Assistance

    It's hard to tell based on the graph - what is the grade percent on that one very steep incline (big drop on the graph)? IMO, once you start riding with some assist, you'll end up wanting to use it more. You'll enjoy getting to work a bit quicker. You'll find you can still pedal at a good...
  25. wturber

    The massive capacity loss of a out of balance pack.

    So you were going to rig up some wires to use an 18650 charger on your 21700 cells?
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