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Damarafaka

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About Damarafaka

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    Barcelona, Spain

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  1. Delighted to receive such a constructive criticism and in depth analysis of general overleans and log analysis. Thank you very much, was very educational and eyeopening, always willing to learn.
  2. I have always had a deep respect for Marty's opinions and precise technical knowledge of eucs as well as his focus on security and even his conservative riding style even though I prefer, as he usually calls it, a more aggressive way of riding. Once again I agree with his assessment of over-lean as the main cause of the cut-off, not so much the idea that the lack of knowledge or recklessness not respecting euc limitations as the reason for suffering cut-offs. What I am trying to say is that no matter how much theoretical information we have, sometimes it is necessary to experience this issue to truly understand it, or at least get a better understanding. In this case it seems the rider isn't going fast enough to cause such a cut-off but one has to take into consideration the amp peaks and as Marty explained very well, he was accelerating hard already moving fast with the wheel probably still bouncing around some after landing on the concrete again, as well as the riders weight! I'm no expert in voltages, currents, battery power, etc. I just ride fast, too fast, that's my problem. For many we are a bad example for the community, even a danger for fellow riders. I believe that it is also the raw experience of the falls and their riders and videos what allows one to go forward, even higher. I ride a hacked Z10 (limited to 61kmh) in traffic every day and whenever I can I run speed laps in a controlled environment. Maybe I've been lucky with my falls but I'm not afraid of falling. Of course a high speed crash can be fatal but as most of us have found out, trying to not hit a small kid or a stupid fall against a curb at 10kmh cause the worst injuries. The Z10 like most eucs works with something similar to the 80% gotway power limit: near the speed/torque limit, amp peaks (either by bouncing off of bump or/and overleaning will cause TEMPORARY cut-offs! Only crossing these limits can one understand what a cutoff really is and the performance of our wheel, always different. Not only the "usual" cutoffs, far away from the absolute high speed when re-accelerating or after obstacles/amp peaks - the wheel remains in a "safe" speed zone - sometimes even unnoticeable (we hold the pothole accountable for what was really a cutoff), but even the major ones caused by still being in a "slight" overlean when crossing the max speed. After the cut-off the Z10 comes back to life as soon as it feels all parameters are under certain values again. That means that if we can anticipate with our riding posture (more kidney leaning), remain calm taking weight off the pedals but keeping tension in our legs and "riding" the moment, a fall CAN be avoided. I have also the logs of a cut-off after re-leaning at 60kmh, dropping instantly down to around 46kmh before I felt the pedals come back to life and miraculously staying on. My only intention is protest the sometimes condescending attitude towards the lets call them more adventurous risk takers and acknowledge the practical information they can bring to the table with what seems at first only a bad or unruly example. Maybe risking my ass I can also help someone come out smiling, that I can bet you, after knowing that cutoffs don't always have to end with a faceplant and actually recover from one. 2019_05_19_18_09_01 cutoff.csv
  3. Thank you, really appreciate your comment, too kind!
  4. If this is the MSX 64V only...
  5. Riding seems at moments too aggressive, watching wheel bounce around but it is also due to a different style of riding or handling euc's at high speeds, an unorthodox way of allowing wheel to run free without pressing against it with inside of legs. At first the wobbles and violent reactions might confuse and induce an apparent loss of control but in reality this approach lets rider position wheel in ways pressing against it would be impossible or recover from unexpected behaviors and maintain speed and control, "flowing" out of trouble.
  6. Ninebot z10 speed laps just before incident
  7. WheelLog log and screen recording of ninebot z10 cutoff after hitting 60.6kmh (although actual cut seems to take place slightly after with 59kmh) and managing to hold on until z10 recovers and comes back to life. I was supposedly recording with my gopro with the sailvideosystem out of my waist but to my great pain this sequence was not recorded. At least I do have the log details included from the Wheellog app (attached logs of incident only; complete file available) . Just like MRN76 recommends, it is not safe going faster than 55kmh under optimal conditions. Sorry about the overlapping screens (you can still see data under screen if you look closely) and the audio, my nervous reaction during and after cutoff. Looking at the logs I seem to be having two types of cutoffs, one caused by overleaning close to 60kmh and a second one, much more subtle (can be seen in next video) that I had never thought of as true cutoffs caused by amp peaks usually when exceeding 50kmh and hitting a bump or small obstacle, the logs with negative current and power values indicate this behavior. In both cases speed drops down to around 46kmh instantly, if we are overleaning excessively it's almost impossible to recover. 2019_05_19_18_09_01 cutoff.csv
  8. Look, I get it, your concern is with safety and avoiding accidents. Believe me it is not my intention that anyone gets hurt but I assume riders aren't stupid and don't just imitate everything they see without thinking or accept automatically what they see as safe. EUCs are serious machines and should be treated with the utmost respect. One of the intentions of my post and video is to share as much information as possible with the community, chats, blogs, videos...DATA, focused especially on the riders that are interested in finding out the absolute limits of a wheel, the experience and data of a usually more "crazy" type rider. The videos are information, as well as logs from different apps, data that can be crossed with others data to help map the absolute performance of a wheel in practice, not in theory. Safety gear is vital, the more the better but besides the helmet, sometimes certain advice sounds more like something else. I try to give euc's good example, always commuting with helmet and even yellow vest for years now, funny but the helmet seems not to be basic gear for many of the pearl clutchers so eager to patronize, as I have seen regularly, maybe that's why I react sometimes to reasonable critic the way I do, also in certain cases without the necessary justification, I must admit. But just like with many sports, especially bikes and the like, one can practice it in a wholly responsible and almost risk free way, others prefer to perform, may it be hopefully in a controlled circuit, trying to minimize the life threatening risk or injury, but fully aware sometimes the line will be crossed, then it's all about luck. Sorry about the backwards video, happy, safe riding, mate.
  9. I think the unlock is worth it even if you don't cross the speed limits, just for the battery drain limitation on speed, it does not alter the wheels performance in any way (only max speeds altered/amp-weight variations affected) maybe a bit lesser mileage. If you ride the Z10 like a normal Z10, there is NO increased risk. A whole different thing is crossing the line with reduced battery, rider weight close to top end 120kg, etc. How much does your friend weigh and how fast was he going during face plant?
  10. Safe going backwards at 50 to avoid beeps (sorry if I'm naughty)
  11. I agree the helmet was not the best for the speed testing and accept your slap on the hand and honest advice. Believe me I know what it is to fall at these speeds. In my quest to do the same with my ninebot z10 I had the unpleasant experience of crossing this limit after removing the z10's speed limit with a great hack from MRN76, although I was lucky I only injured my shoulder and wheel did not get too badly bruised as well. At first you take it easy, try to slowly shake off the fear, convince yourself that slow is also fun. But something in the blood ends up always kicking in and there I am again so close to the thin line...
  12. Love the theatrics of the virtuous ones always so eager to take the high ground and criticize an extreme video testing out the maximum limits of a wheel with ordinary every day riding. Yes, sir, it is not the most responsible behavior, yes gloves, etc would be advisable, but some riders like to cross the line sometimes or at least try to get as close to it as possible because that is the way we understand life. Not just to share data with my fellow riders but because I enjoy pushing the wheel under reasonably controlled environments, experimenting and performing high speed slalom runs, knowing I can "safely" cruise close to 60kmh after the speed tests. Others prefer other riding styles and speeds and that's ok too. I prefer to do things my way even though I am perfectly conscious that a sudden amp peak after hitting an unexpected obstacle at those speeds can sometimes end in disaster, that's the exact reason we do it. My guess is that you would have never made it to the moon if the sight of the blood was just too much.
  13. Interesting idea to push wheel slowly to avoid amp cutoff. Does the variable 60% battery result in higher amp readings/peaks with the same conditions compared to a 100% battery?
  14. The theory does not always match reality. With this logic, correct me if I am wrong, the rider weight would have almost no relationship to reaching different top speeds, not like the 80% power warning of the gotways allowing huge variations in speed with a 30kg difference in rider weight. Don't get me wrong, I have no interest in convincing anyone of reaching one speed or another, I want the most information possible regarding the theoretical limits of a certain fw, of the wheel performance itself and the results of real testing, in my case a 68kg rider and the added possible lessons from a real cut-off with the scarce data from the wheellog app and my experience. When I recover I will make more tests. Thanks for the link.
  15. The purpose of the details is allow fellow testers to have all the possible information and data regarding the behavior of the wheel at these speed limits. Of course the logging would have given much more useful info as well as a video. I admit that your assessment is perfectly possible, that the wheel could have free spun after bouncing around after cut-off, but in my opinion it is more probable that the speed was reached before cut-off, it is even possible that the speed was reached even before and the cut-off occurred with a slightly lower speed but triggered by bumps on the road. Once again, the goal is to know what variables, speed, inclination, road condition, tire pressure, etc. are causing a cut-off in order to find a "safe zone" for extreme riding. I am no expert in electronics or programming, but I have done the same testing with my MSX and ride a safe zone with my weight around 60kmh. I have lots of youtube videos doing what I call high speed laps (as well as with the stock Z10). Of course there are risks during testing and with my Z10 with 7.6.1, I was in no way planning to reach 70kmh, being perfectly aware the fw clearly states 61 as top speed, I wanted to hit this speed taking advantage of my 68kg, it felt safe enough to reach this limit. I ride 60kmh pretty comfortably so it was perfectly possible that such a powerful and stable wheel as the Z at high speed, if you know how to ride it aggressively, could have reached the mentioned speed before cut-off no problem.
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