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EUC

Found 3 results

  1. This was the best case scenario today: I impressively learned that I still can't do it. I hit a speed bump that I hadn't seen at all (not yet painted, hence black in black, and me focussing somewhere else) at maybe 15km/h and boom, belly on the floor. Nothing serious happened. A small hole in the jacket and I can distinctively feel a bruised elbow and knee, compellingly reminding me that I still can't do it. I have practiced going over this type of speed bump for a while at various speeds, even without looking, but of course always prepared and knowing what was coming. Yet it didn't help (yet). This lesson raises the interesting question: how to train being prepared for the unexpected? Otherwise, any good physical reminder to stay careful is somewhat the best scenario possible.
  2. V5f doesn't charge or turn on. With shell removed and tested, battery indicates zero voltage (72v original, 84v charger). On charger connect, registers 24v for 5 seconds, then drops back to zero. Battery, bms, charger or sleep problem? https://youtu.be/JK-phwb74-4 Another Li-po 48V scooter battery registers 24v, when lamp connected flickers on/off at maybe 10 blocks/second. Problem/solution?
  3. Shutdowns generally end like this and are as painful as this looks. Notice how her feet are in space and can't push against anything to break the fall. If, like me, you ride slower than you can run, overleans and other mishaps can be recovered by stepping off but the physics is different in a shutdown and you can't just step off. It is like this. This guy demonstrates the technique for an unpowered dismount. From the moment of unbalance he is falling but he lifts his knee quickly enough to get his foot forward under his body and uses the forward momentum to lift him like a pole vaulter. He knows it's coming and the physics is not opposite to what he is expecting so a shutdown for you is more difficult than for him. My four ended in more pain than any other mishap. On many wheels battery protection has been prioritised over rider protection which can lead to a shutdown without warning. Wheels designed this way and fitted with low quality batteries can shut down at any time but even with good batteries they become dangerous as the batteries age. A rider is only likely to be aware of a rare and mysterious catastrophic failure on a wheel that was for a long time safe. Early battery replacement with good cells will avoid shutdowns or the battery can be modified. The graph below for an Airwheel X8 shows published battery data overlaid with testing data of an aging cell X (black), damaged cells X (grey) and a generic battery with different, damaged cells X (blue). The discharge rate for the X tests was 0.2 amps. The aging cells were still able to sustain a voltage above the tilt back/warning voltage long enough to warn a rider but the damaged cells went from above the warning voltage to below the shutdown voltage too quickly. The generic battery had a shutdown voltage higher than the warning voltage, making it unsuitable for this Airwheel X8 from new. A longer version of this summary is published elsewhere.
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