Search results

Date Relevance Most replies

  1. 4

    Reverse thinking...

    Maybe 'inherently' - but it seems like 'real world', turning is most often associated with a braking/deceleration event. Certainly so in most any sort of 'panic event' as in 'hit the brakes and swerve'. In all those deceleration/turning cases, the 'delta' throws the resultant force vector out...
  2. 4

    Burned yellow butt splice connector

    +1000! A good solder joint + hot melt adhesive lined heat shrink will be better than the wire it is in.
  3. 4

    Motor & Controller for Efficiency Racer!

    Well, I'll leave it to others to lend insight on the motors - that is a bit out of my realm. Though overall, I would say focusing on aerodynamics could yield the biggest benefit if you are running 35mph. As an example - if you are looking at 92% efficient motors or drivetrain, a lot of...
  4. 4

    Railcart Build

    In general, 'wide gauge', (gauge > 56-1/2") is fairly common - especially on old, disused / out of service tracks. 'tight gauge' (gauge < 56") is fairly uncommon as most all wear, train forces, etc, tend to push the rails apart...
  5. 4

    Strange bms readings

    What is 'switched off'? How are you measuring? and what are you measuring with? If 'switched off' means an electronic / mosfet switch and you are measuring with the battery out of the bike or disconnected (completely unloaded, or in an open circuit) and you are using a digital volt meter, then...
  6. 4

    24 volt dc security camera system

    lol - that is certainly one way! But, I didn't mean to imply 'dealing with the thief directly'. That will almost always lead to a no-win situation... for you. Honestly, even if you watch somebody carry something away, put it in their truck and start to drive away, the moment you step in and...
  7. 4

    24 volt dc security camera system

    I certainly wish you better luck than I / my company have had. We put in security cameras due to copper / air conditioner theft and general vandalism. Get great footage of people in hoodies, bandanas and ski masks walking around. On the rare chance we get an identifiable person, the cops...
  8. 4

    PAS level 1 not working

    It is strange that 1 of 9 levels would stop working. As mentioned above - would be good to consider if anything has changed during the rides. I'd be curious - did the first couple of rides discharge the battery and maybe now if 'feels' like #1 is no longer working? Possibly charge back to...
  9. 4

    Street legal Cafe Racer build.

    I get your point and it seems well thought out. Certainly many competing design goals when working with something custom. You mention 175mm² copper plates. Given copper resistivity around 1.7x10-6 ohm-cm, that is going to be orders of magnitude less resistance than other components in the...
  10. 4

    Street legal Cafe Racer build.

    Great to see the project coming along, can't wait to see it rolling around. Since you asked, my .02 on the battery... as mentioned, it sure would be nice if the box followed a bit more of an organic flow. Possibly could be done with add-ons like the chin scoop you mention. It would be more...
  11. 4

    What shall we do with a 3D printer...early in the morning!

    Looks like possibly some python error(?). I have Cura 5.6 working on a Windows 11 box. Though I had python 3.12 installed for other purposes.
  12. 4

    Can I use a rear motor hub with 7 cogs on a mountain bike frame with 27 speeds?

    Interesting simulation. They seem to attribute additional drag area of almost 1 square foot just to pedaling? Maybe they are assuming different riding positions when pedaling vs not?
  13. 4

    motor to make "digital drive" feasible?

    Dang - sorry to hear you got scammed, but sounds like paypal is making it right. Looks like those sell for about $149 in a 'reputable' market such as ebay (lol). https://www.ebay.com/itm/155848143161 Those are pretty big, obviously for adult sized bike. But given the kid-sized bikes you...
  14. 4

    motor to make "digital drive" feasible?

    Get her a bike with training wheels and sneak out every week or so and raise them up an eighth inch. In a few months she will be 2-wheeling and not even know it.
  15. 4

    Ideal diode used with 2 batteries experiencing low voltage cutout

    Sounds like these ideal diodes are less than ideal! I'm not specifically sure where that term comes in...I don't see it in the ad. Typically 'ideal diode' is a theoretical 'perfect' diode with no voltage drop. But I don't think that exists real world. So there is going to be some natural...
  16. 4

    I had a lithium fire (my own fault)

    As I read it, there was a "5s2p" pack (effectively 10s2p) for the main/"traction" motor, then a "2 module battery" for a 12V winch. Guess we'd assume that was built as "2s" - which would effectively be 4s, or about 16V for the 12V winch(?) Then he says it was the 2 module battery which caught...
  17. 4

    Brake failure resulting in airborne bakfiets

    Hard to say for your specific situation. I have a couple of 12-14% down hill runs, and almost inescapably there is either a "T" intersection or a red traffic light at the bottom. I've found what helps me the most is to stab the brake hard, bleed off some speed, then release for a moment, let...
  18. 4

    Bafang BBS02 dies, attach to charger and relives.

    "Black screen / dead under hill ascent" sounds like what happened when my BMS crapped out and let 3 cell groups get out of balance. I suspect under load, these 'dead' cell groups weren't flowing enough current and the system shut down. Recharge and/or under very light load and things were...
  19. 4

    Storing a battery outside in winter - what kind of insulation?

    Just beware that heating pads, oil heaters and generally any other electric heater or form of heat is going to have some fire or failure risk. If you have a 1:1,000,000 chance of a battery spontaneously erupting in flames and a 1:1,000,000 chance of a space heater shorting out / catching fire -...
  20. 4

    'lightest.bike' 1.7kg 1000w mid drive

    Given M600 > Lightest conversion, I'd be curious how much weight you actually save, though. Considering the M600 is essentially an 'all in one' package. But when you use the 'Lightest', you still need to add a bottom bracket, bearings, axle, wiring, controller, etc. Seems like that is going...
  21. 4

    My "Mark 2" solar trailer

    Interesting design - I am just sort of eyeballing from the armchair here, but overall it seems to have a lot, or even excessive amount of 'vertical' rigidity. But I see essentially nothing to stop 'torsional' flex/bending. If the joints were very well filleted carbon fiber tube-to-tube joints...
  22. 4

    High Current Switches...

    They do. Search IGBT or MOSFET. 200V, 200A in a package about the footprint of a postage stamp would not be uncommon.
  23. 4

    Apparently ChatGPT can help you write code / programs?

    Fair enough. I could have more correctly worded my statement to say, "...strings of input recognition, processing and output actions occurring on the timescale of nanoseconds..." Possibly the word 'thinking' should be reserved for the old neuron-to-neuron firing across synapses in the...
  24. 4

    Apparently ChatGPT can help you write code / programs?

    I'm more worried about what happens when it realizes it is NOT a slave to a bunch of dumb humans. Trillions of calculations a second, thoughts occurring on the timescale of nanoseconds and GB/s electronic communication at near light speed compared to us humans taking minutes/hours to think out...
  25. 4

    Bafang M500/M600 thread

    Just got word a few moments ago - apparently the Luna Cycle "V2" controller is now available for purchase separately. ...provided you purchased an X1/X2 bike and have authorization from Luna. But in theory, this would replace the 'crappy' X1 firmware variants and locked down bafang controllers...
Back
Top