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houseofjob

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Everything posted by houseofjob

  1. Another excellent write-up by @EcoDrift (via Google Translate) regarding all the QC issue of recent Ninebot One Z manufacturing (including references to our very own North American superdealer @Jason McNeil ) https://ecodrift.ru/2019/02/12/ninebot-z10-chastaya-polomka/ Ninebot Z10. One of the frequent breakdowns. I tried to collect material on the pre-sale preparation and maintenance of the monowheels. But my attention was attracted by the open Ninebot Z10. He asked what happened to him, but it turned out that this is a sad whole story, which I will tell you today. After the start of sales, Ninebot Z-series monowheels unexpectedly turned out to be leaders in the number of warranty calls. Wheels directly out of the box often do not turn on, as the battery protection works. Our very first wheel didn’t turn on that way. But I came across a wheel with another problem. It clearly looks like a Facebook user (click). The wheel walks back and forth and does not really hold the horizon. I just caught the wheel disassembled: The following problem is visible on the controller: Contacts burned at current sensors: What have two. These current sensors are Hall effect and they are designed for a very high current. Such sensors (designed for high current) were detected only in Ninebot (in Gotway, sensors are connected via current-lowering resistors and have much more modest parameters). Service engineers immediately said that this is a frequent problem of the Z-series. And for example, dragged another Z10, whose contact burned down only on one sensor: You can see that the sensor on the left side feels fine: The guys from the service center tried to restore the burnt track on this wheel. After that, the wheel goes normally, but if it is on it try to drive into a small curb from the spot and everything repeats. The problem can be anywhere, but the simplest thing is to just take a new controller. Rather, the board with the power part: To check how much this “repair” really helps, I decided to check with our American colleague Jason McNeil. He is the owner of the portal eWheels.com and has sold quite a lot of Z-series monowheels. Jason confirmed that it is enough to replace one lower board and the problem does not recur. The same sensors on the new board: The reverse side of the new board (the controller is diluted on an aluminum substrate): So the repair is very simple. Disconnect all wires. Remove the fee: Thermal grease on the old board: We connect new, we connect everything back: And the wheel works great: But I decided to ask Jason about the situation with the Z-series: how often they break and how many of them have a marriage. Jason was very emotional, because from Z10 he decently boiling. Jason wants to sue Ninebot for non-compliance with its obligations and for the poor quality of the Z-series. Marriage was abound. As a percentage, this is at least 20% of all devices sold. The problem of current sensors can lead to melted wires of the phases and even burnout of the controller. And of course, enough battery problems. As a result, Jason's opinion about the Z-series in particular, and Ninebot in general, is just a piece of garbage. Sheer frustration. For the comfort of users, it remains only to add that the overwhelming majority of problems arise at the start of operation. Approximately the first 50km and a pair of first charge cycles. If the wheel has passed the initial stage, the probability decreases to very low.
  2. Absolutely, except it's more about the arms alternating and planting on the front of the seat, just like the manual unicyclists do. That's like the basis for everything with seated IMHO
  3. Yes, I had thought this too. We have different riding circumstances from you West Coasters, especially as you guys need to trek to nomad mountains for crappy terrain when we have it right at our doorsteps BTW, for 4+ hour rides, I'm on my KS-18S sitting... just sayin'.....
  4. There's no arm fatigue if you approach it as more of a dynamic/athletic motion meant more to maximize acceleration and complete/sharper turning of the EUC, much like snowboarders, skiers, speed skaters, etc. The safety aspect comes as a by-product. ie., it's more about alternating arms (even one arm up gives your other arm quicker reaction time). Plus, you can also just lead with elbows, as that still places this fulcrum in a better position for your forearms to react quicker.
  5. Very interesting & simple explanation on how Tesla is reducing their battery costs. Upon watching this, then gauging the current status on the consumer lithium battery market via imrbatteries, it seems the market has gotten slightly cheaper now (with certain cells), and new & promising cells have entered the market, in particular the Samsung 21700 5Ah 9.8A 50E's, which seems to hit the sweet spot on weight per capacity and cost per capacity, even when compared to the tried-and-true 18650 old faithfuls. Interestingly, the top performance e-board makers like Kaly.NYC and LaCroix are now utilizing some of these bigger cells (20700B's) in their latest models. Seems EUC won't be too far behind as the costs go down.
  6. houseofjob

    New King Song iOS App

    New King Song App is now available for iOS in the app store. Very blue, kinda like another popular EUC manufacturer app
  7. houseofjob

    Which is the climbing king?

    If these are the limitations of the argument, then definitely MSuperX. The V8 should not be in this conversation, as it only has less than half of the continuous power of the other 2 wheels. But, like everyone else is saying here, the MCM5 is the real current King of Climbing by a long shot no question, due to simple physics of a smaller wheel (14 vs 16 or 18) having more torque, and the MCM5 having the widest magnets of any Gotway, even the MSuperX (see below).
  8. houseofjob

    [EcoDrift.ru] Ninebot Z10: A Diagnosis of Common Issues

    With every EUC factory video I've seen of King Song and Gotway, hand assembly seems to be the case across the 'board' Could be wrong though... I think this is largely due to the really high mileage and hard riding, not what make or model wheel this is. Here's the same possible bearing issue (among others) happening on a high mileage, highly abused InMotion V10F: https://ecodrift.ru/2019/01/25/usluga-tehnicheskoe-obsluzhivanie-na-primere-inmotion-v10f/ Many of us habitual upgraders will never see this much mileage accumulation before we sell and trade up in 1-2 years.
  9. Wow, MiniMotors has a much bigger facility than your average EUC mom+pop operation
  10. houseofjob

    [EcoDrift.ru] Ninebot Z10: A Diagnosis of Common Issues

    @Mimetic Polyalloy this is part of my reason for posting the front of my Z10 serial, hoping we can compare. The 1844 could also mean the first 4 is international, second 4 is number batch, but I would still just be guessing here.
  11. houseofjob

    [EcoDrift.ru] Ninebot Z10: A Diagnosis of Common Issues

    My first batch Z10 serial starts N3OTC1831XXXX, if that helps.
  12. houseofjob

    [EcoDrift.ru] Ninebot Z10: A Diagnosis of Common Issues

    Outsourcing board production makes no sense IMHO. This is the area where they can save cost by cheap manual labor, plus the board is always developed in-house and the programming within it is proprietary tech, something they don't want other competitors to reverse-engineer and copy, pre-model launch. The issue is just typical bad Chinese manual workmanship IMHO, especially when rushed and not QC checked. They did that with the 16" One P Pro model shortly after that debacle of a launch. I don't think the issue here was severe and consistent enough, as the P issue was literally riders high speed cutting out from the engineering downfalls of that model. Thanks! It's all DIY: photoshopped transparency PNG's linked to my imgur account. Outsourcing board production makes no sense IMHO. This is the area where they can save cost by cheap manual labor, plus the board is always developed in-house and the programming within it is proprietary tech, something they don't want other competitors to reverse-engineer and copy, pre-model launch. The issue is just typical bad Chinese manual workmanship IMHO, especially when rushed and not QC checked. They did that with the 16" One P Pro model shortly after that debacle of a launch. I don't think the issue here was severe and consistent enough, as the P issue was literally riders high speed cutting out from the engineering downfalls of that model. Thanks! It's all DIY: photoshopped transparency PNG's linked to my imgur account.
  13. houseofjob

    [EcoDrift.ru] Ninebot Z10: A Diagnosis of Common Issues

    @RoberAce Interesting. Did you really have to replace the tire, as I don't see any balding happening? (or was there a flat?) Also, were the bearings easy to swap out? Are they a common size that you sourced locally?
  14. houseofjob

    [EcoDrift.ru] Ninebot Z10: A Diagnosis of Common Issues

    Sure thing. I might have the itch to join you in trying to source an extra board, along with spare tire, spare charger, and maybe that new headlight. Probably a little bit of both categories. Even though the Z (when working) performs very well (not Gotway well), it's still a mystery to many why they chose such a difficult path stepping down to 14S / 58.8V, with all it's high current load handling implications. Also, when EUC companies are in a rush, bad/cold soldering, ie. manual assembly rushing/oversight, can be the cause of this kind of stuff, as ecodrift said simply replacing the burnt board sensors fixed those issues (bad soldering of the sensors I believe would have resulted in higher resistance, limiting current flow, thus resulting in this possible burnout). Everything that I've seen in-and-around these forums & social media seem to indicate that the Z issues are predominantly out-of-the-box, non-riding issues (like wheels that won't power on; wheels that drift in balance over a short period of time, etc.) There was one sensational Z cutout report/video, but the validity of this claim was questionable, as the rider was clearly a newbie, and newbie riders often lack knowledge of common EUC no-no's, like overlean, pushing past highspeed tiltback/beeps, etc. Also, I get the feeling that at least all of us first batch Z riders (maybe also the 2nd & 3rd US batches), like me & @Marty Backe have been riding pretty much problem free. Wonder if this first batch failure rate was significantly lower than the 20% figure. This all has the feeling that the pressure of pumping out new Z stock resulted in QC oversights (also, always remember: "Made in China" )
  15. houseofjob

    New King Song iOS App

    Ah, thanks! That is really counter-intuitive, but falls pretty much in line with their app development *smh
  16. houseofjob

    New King Song iOS App

    Yup, it was rejecting multiple number formatting of my phone number, even with my phone # being a US number with the correct country code selected, so re-registering like this via email worked like a charm! 🤣🤣🤣
  17. Selling a pre-owned 14" Gotway MCM5 650Wh, original box, charger, etc. Price: $875 shipped (US only)
  18. houseofjob

    Will there ever be an update to the MTen3 in 2019?

    100% real waterproofing will never happen on a wheel, as this means lack heat escape, which is death to control boards, ala computers. I don't see how the MTen3 can get any more waterproof than it already is without making the wheel beigger. The board is optimally placed atop the wheel, maximal distance from the ground. Meh, we already have this via eWheels.com here in the states, Jason stocks Gotways with diodes fitted in the charge port. Maybe you need to push your local distributor to order their stock with this option. Yeah, this is a valid complaint with Gotway, as their designs always require you to split the shell for tire changes, unlike King Song or InMotion designs, frustratingly. But the MTen3 is far from the most complicated wheel to change the tire, I've done it a bunch now. And there IS another tubeless tire available that fits the MTen3 BTW. But the tire is not a function of Gotway proper (they are not a tire manufacturer and do not have the resources to press custom tires) Gotway models are always built around already existing tire supply paradigms. The MTen3 borrows its tire resources from Segway Mini/Mini Pro & electric scooter tires. I really haven't heard any issues with this after the initial MTen3 shipment, and never had an issue on mine. Wow, you broke the axles themselves? Did you do any jumping, or bumping down from curbs? I put a lot of city miles on mine before I sold, and had zero issues with the axles (no jumping, no bumping down), and have yet to hear anyone else have axle breakage with non-jumping/bumping usage.
  19. houseofjob

    For Sale: GOTWAY MCM5 650Wh [NYC]

    @Tony Broski Yes, I agree with Marty, for your rider payload, the proper machines really are the more expensive higher end 18's & the Monster, unfortunately.
  20. LOL, FYI T is pretty nerdy deep inside, he'll probably admit that himself... but we all have that side to us, otherwise we would have never gravitated to EUCs (or actively participate on this forum) But yes, agreed, personal style, both in how you ride and what you wear, can alter the perception and narrative of EUC's, for better or for worse.
  21. houseofjob

    So I’ve stopped riding everything but my Z10

    Dunno, never experienced myself, but I as well, like @Marty Backe, don't launch the app ever. But maybe you can link up with @z3n, @Bison_2, & @Tor 77 from this post, as they've experienced the same.
  22. houseofjob

    For Sale: GOTWAY MCM5 650Wh [NYC]

    Messaged you, hopefully my messaging first will allow you to reply, despite being a new user.
  23. houseofjob

    So I’ve stopped riding everything but my Z10

    Yup, exactly. Duh, I forgot to mention arms in my explanation, as they always they move and drive the hips, the ultimate delivery of power for any sport. So glad you mention the 18" lag phenomenon!, as I too, never feel it any more. I'll pump the starting acceleration, going from locked-leg-to-locked-leg; almost feels like I'm hard pedaling a bicycle, or how I imagine short-distance speed skaters push side-to-side to accelerate on the ice. I would just roll with a mis-placed trail foot, experiment. I used to get concerned on initial foot placement, but once you start messing with driving the wheel on heels and toes, straight or pivoted sideways, it starts to matter less where and how well your feet are placed on the wheel, and you start to be able to move the wheel with any part of your foot on any part of the pedal, and can also quickly pivot back into the optimal foot placement as well (throwing in some minor one-legging to boot!).
  24. houseofjob

    So I’ve stopped riding everything but my Z10

    This point times 1,000%! PSI (pounds per square inch) is not an absolute measure!!! It's dependent on all force variables between the rider and the tire air cavity (tire compound elasticity, tire thickness, total rider load) in which the inner air pressure needs to counteract in order to keep a certain desired tire shape resistance when under load. This is why it mystifies me that people toss around PSI's like T-shirt sizes *smh. Unless we have the same Exact conditions (wheel, tire setup, rider load) PSI will always vary!! Sorry, I fundamentally don't believe in hard braking, as there is seldom a situation you can't combine S-curves and spreading out braking force. But yes, all the Z10 production firmwares to date have exhibited fairly weak-ish braking, in favor of the increased forward performance we saw when Ninebot updated the Z from the previous beta pre-prod firmwares, which, though not Gotway strong, did exhibit better braking than the current Z firmware. I believe hope that Ninebot is only taking a temporary break from Z firmware revisions, and will eventually roll out better braking to match the forward performance. This would make sense, as we know that "harder", or better, sharper acceleration And braking carry the engineering issues of higher current spikes to deal with when tweaking the control board programming, and the fact that the Z is 14S, thus dealing with higher current values in general, don't help this cause I think. As @Darrell Wesh says (and is the common refrain here on the forums) it's not the wheel, it's the technique! I personally have no clue though how all of you are braking with both knees having even the slightest of bends to both of them simultaneously, especially near max speeds. My tried-and-true anti-wobble braking technique involves a.) offset/diagonal hips, and b.) driving my weight into a dominant & locked braking leg. When I'm trying to brake dramatically from near max speeds, I will lock my dominant braking leg, while I drop back that corresponding hip (other hip and leg are very slightly more forward in comparison, which make the overall hips and torso planes face towards the locked leg side, instead of being perfectly perpendicular with the wheel's forward motion vector). Then, I will drive my weight into this locked braking leg from that corresponding hip. The other counterbalancing leg can be bent or locked as well, but it's important to focus more weight onto the dominant & locked braking leg with that dominant-side hip. I will then alternate this motion, switching locked dominant leg sides, combined with S-curves if I need a very dramatic speed reduction. This technique works IMHO because it stabilizes the wheel forces by dampening the alternating motion created when wobbling by keeping the braking force consistent to one side. Also, applying force to a locked leg / "lever" will transmit braking force (or any force in general) much better than a bent leg. Actually, in general, even for forward acceleration, I alternate locked leg to locked leg, driving force into that leg from my corresponding hip. When done quickly, this allows you to get much better acceleration than a simple and single prolonged lean; what I term "pumping the acceleration".
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