Yffisch Posted June 1, 2018 Share Posted June 1, 2018 I've been riding my wheel for about 6 weeks now and it has been totally flawless, and could have been. I have an MCM4 680wh wheel and I like it very much and I'm extremely satisfied. I've turned off all the speed limits with my app. When I exceed the speed limit, it beeps once, then twice, then thrice and then multi beeping. Sometimes for fun when it's safe, I just let it do the multi beeping and continue riding my wheel. Though today, my wheel had around 50% battery left or something and I increased my speed past the 1:st beep, 2:nd beep, 3:rd beep and I was multi beeping. Then suddenly, the gyron on the wheel just released for me and while leaning forward, the wheel just tilted me forwards as if the wheel was turned off. And I was at around 25-30kmh or something. That made me fall off my wheel which gave me a lot of scratches and destroyed my clothes. Why did this happen? Was my wheel broken or does the wheel actually stop doing the gyro thing when the battery is "low" and you exceed the speed limit? That must be the stupidest feature ever made? It has worked great to exceed the speed limit before this, but I guess battery has been on like 60% or something. Could someone explain this to me? Is it something wrong with my wheel or is this to prevent you from riding too fast? 3 Quote Link to comment Share on other sites More sharing options...
Popular Post kasenutty Posted June 1, 2018 Popular Post Share Posted June 1, 2018 12 minutes ago, Yffisch said: Sometimes for fun when it's safe, I just let it do the multi beeping and continue riding my wheel. This might be fun, but it's definitely not safe. 5 5 Quote Link to comment Share on other sites More sharing options...
Popular Post Ipsiain Posted June 1, 2018 Popular Post Share Posted June 1, 2018 Emm. Respect the beeps? They are there for a reason. Im guessing it just cut out because the demand was greater than the supply. I think its normal behaviour. Like yourself ive turned off my alarms, only difference is when i hear the first beep i let off a bit. 4 4 Quote Link to comment Share on other sites More sharing options...
Popular Post Pasi Posted June 1, 2018 Popular Post Share Posted June 1, 2018 I think beeps tell you that maybe it is better go slowly or something....... 5 5 Quote Link to comment Share on other sites More sharing options...
Popular Post Shemp Posted June 1, 2018 Popular Post Share Posted June 1, 2018 23 minutes ago, Yffisch said: Why did this happen? Was my wheel broken or does the wheel actually stop doing the gyro thing when the battery is "low" and you exceed the speed limit? This happened because you exceeded the motor's capabilities. It warned you repeatedly not to do that and you ignored it. High speed, face first dumps are what happens when you go beyond the machine's capabilities. There's nothing wrong with the wheel. Highly determined user error will often result in bad outcomes. 5 5 Quote Link to comment Share on other sites More sharing options...
Popular Post esaj Posted June 1, 2018 Popular Post Share Posted June 1, 2018 To get all "scientific", you exceeded the speed where the battery voltage is not enough to cause a large enough current to flow through the motor. The faster the motor spins, the larger voltage the motor itself generates. Yes, an electric motor is also a generator, if you spin the wheel by an outside force, it generates a voltage that could be used to power other equipment. When the battery power is used to spin the motor, the motor still produces its own voltage, this is called back-EMF (back electromotive force). For an electric current to flow, there must be a voltage difference. Once the motor spins fast enough to produce a back-EMF equal to the battery voltage, the current can no longer flow. Current is what creates the torque of the motor, so at that point, there's zero torque on the motor, and it cannot accelerate to keep you up when you lean forwards. Actually, it will happen before the 0-torque point, there might be torque "left", but not enough to keep you upright when trying to accelerate, or you just hit a bump or whatever which would need a higher torque momentarily to overcome, but there's not enough "buffer" left. The lower the battery voltage goes (the more empty the battery), the lower the speed where this occurs. There are lots more detailed threads spread across the forum in case you're interested in the more "techy" details. 7 13 Quote Link to comment Share on other sites More sharing options...
WARPed1701D Posted June 1, 2018 Share Posted June 1, 2018 17 minutes ago, esaj said: To get all "scientific", you exceeded the speed where the battery voltage is not enough to cause a large enough current to flow through the motor. The faster the motor spins, the larger voltage the motor itself generates. Yes, an electric motor is also a generator, if you spin the wheel by an outside force, it generates a voltage that could be used to power other equipment. When the battery power is used to spin the motor, the motor still produces its own voltage, this is called back-EMF (back electromotive force). For an electric current to flow, there must be a voltage difference. Once the motor spins fast enough to produce a back-EMF equal to the battery voltage, the current can no longer flow. Current is what creates the torque of the motor, so at that point, there's zero torque on the motor, and it cannot accelerate to keep you up when you lean forwards. Actually, it will happen before the 0-torque point, there might be torque "left", but not enough to keep you upright when trying to accelerate, or you just hit a bump or whatever which would need a higher torque momentarily to overcome, but there's not enough "buffer" left. The lower the battery voltage goes (the more empty the battery), the lower the speed where this occurs. There are lots more detailed threads spread across the forum in case you're interested in the more "techy" details. Awesome explanation! 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Marty Backe Posted June 1, 2018 Popular Post Share Posted June 1, 2018 Glad you are OK. I never ride when I hear the 5-beeps. You're just asking for trouble. On all of my wheels I disable the 1st and 2nd alarm. Then, if I ever hear beeps I immediately off the 'gas'. If you want to ride really fast (which it sounds like you do) then get a more powerful wheel that can go faster, safely. You really can't say That must be the stupidest feature ever made? You turned off tilt-back and then ignored the safety beeps. 6 7 Quote Link to comment Share on other sites More sharing options...
Popular Post WARPed1701D Posted June 1, 2018 Popular Post Share Posted June 1, 2018 (edited) It should also be noted that the wheel likely did not cut off on you. You over-leaned it, meaning you leaned beyond the wheels ability to accelerate back under you. It was likely still driving forward as hard as it possibly could but for all the reasons expertly described by @esaj could accelerate no more. If it had been a cut-out where all driving force is lost and the pedals go floppy under you I very much expect you would be writing this from a hospital. There is lots of stupidity to go around here. Gotway gets the bulk of the points for allowing riders who have no clue how the device works to turn off speed limiting features like tiltback but don't worry you get some for knowing you were exceeding the speed limits but keeping going anyway. Edited June 2, 2018 by WARPed1701D 1 4 Quote Link to comment Share on other sites More sharing options...
Popular Post Yffisch Posted June 1, 2018 Author Popular Post Share Posted June 1, 2018 Thanks a lot for info. Of course I know that what I did was wrong. It is no secret. I just wanted to know if I can trust my wheel in the future. And I guess I can after Reading this. Thanks a lot for the info! I was stupid and I had to suffer from my stupidness, that I already know. It all went well and my wheel lost a bit of plastic and I got some scratches, but I had protection gear and it was not that bad to fall. Quite an experience. From now on I will never exceed the first beep. The thing was that I've exceeded those beeps hundreds of times during my 6 weeks and nothing has happened. But this time, It was too much and I was stupid and will never do it again. Thanks esaj for your explanation. Very well writteb. 4 4 Quote Link to comment Share on other sites More sharing options...
Popular Post Yffisch Posted June 1, 2018 Author Popular Post Share Posted June 1, 2018 And again. Thanks for caring! Never ever ride without at least arm pads, gloves and helmet. Knee pads were not really useful in this scenario. But the arm pads and the gloves (thick MC gloves) really saved me from severe injuries. Never do the same misstake as me. I really regret my lack of knowledge but I am really happy it all went well. It is a very good vehicle, but don't do what I did. I thought the beeps was just a warning of the speed, and not actually a warning about the vehicle itself. Please, take care out there and respect thr beeps. I know that there are probably other newbies that will do the same misstake as I did. Just don't!!! 4 3 Quote Link to comment Share on other sites More sharing options...
Popular Post Rehab1 Posted June 1, 2018 Popular Post Share Posted June 1, 2018 23 minutes ago, Yffisch said: Thanks a lot for the info! I was stupid and I had to suffer from my stupidness, that I already know. It all went well and my wheel lost a bit of plastic and I got some scratches, but I had protection gear and it was not that bad to fall. Quite an experience. Glad your ok! At least you were wearing safety gear so that’s not stupid. In the end consider this a good experience and you will begin listening to the beeps with respect. 2 3 Quote Link to comment Share on other sites More sharing options...
Popular Post Hunka Hunka Burning Love Posted June 1, 2018 Popular Post Share Posted June 1, 2018 Oh, the beeps are warnings? I thought they were rewards for reaching a certain speed threshold. Like one beep you're doing good, two for better, three excellent, five wowie you're flying! Maybe I'm playing video games in my parents' basement too much. 4 2 Quote Link to comment Share on other sites More sharing options...
Popular Post meepmeepmayer Posted June 1, 2018 Popular Post Share Posted June 1, 2018 2 beeps = first speed warning (you can set it to any speed, and disable it if you like) 3 beeps = second speed warning (you can set it to any speed, and disable it if you like) Continuous beeps = 80% power warning (you can't disable it, for good reason). If you hear that and don't slow down, the wheel can't keep you upright if you go faster or and bump happens. Which is what happened. 3 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Kens Posted June 1, 2018 Popular Post Share Posted June 1, 2018 The beeps is there for something.. Being a new rider, my adrenaline spikes whenever I heard the first beep. I'm surprised how supportive forum members here. I'm just thinking you are gonna be eaten alive by everyone while reading your original post. But no, they are very tame and understanding. I just got my first wheel one month ago and this forum is one of the reason I bought it. Today I decide to join after being a lurker for a while. Sooo.. hello me! ? 8 4 Quote Link to comment Share on other sites More sharing options...
Yffisch Posted June 1, 2018 Author Share Posted June 1, 2018 Hehe, fun comparision with the coin collecting ? But to be honest, I really thought the beeping was just for you to keep track of the speed. Like if I set the limit at 31kmh which I have now. Then first beep is 32kmh. Second is 33kmh. Third is 34kmh and continuous beeping is 35kmh which is said to be max capacity on mcm4. I did not think the vehicle itself would react to this. Just a warning what speed you are at since there is no speed display except on your phone. But you don't really have your phone up while riding. But I was wrong and knew to little about the vehicle. I'm glad people don't eat me alive for this since they are probably grown up people. 2 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Keith Posted June 1, 2018 Popular Post Share Posted June 1, 2018 (edited) For those of you who would like to see exactly the kind of crash @Yffisch experienced beautifully demonstrated see the below video (2:18s) in is the good bit for those with a low boredom threshold: P.S. I’m surprised this hasn’t been linked to in this thread by anyone else already as it’s been shown a few times on this forum to demonstrate just how quickly it all goes wrong if you ignore the beeps. Oh and also brilliant explanation by @esaj oh and also by the way @Yffisch this guy managed to Dislocate his arm, even with protective gear - so you were pretty lucky! Edited June 1, 2018 by Keith 3 4 Quote Link to comment Share on other sites More sharing options...
Popular Post Kens Posted June 1, 2018 Popular Post Share Posted June 1, 2018 (edited) Few more videos from Youtube for EUC face-plant awareness.. I got it from Bell Super 3R vs Giro Switchblade review thread. Edited June 1, 2018 by Kens 4 1 Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted June 2, 2018 Share Posted June 2, 2018 3 hours ago, Yffisch said: Thanks a lot for info. Of course I know that what I did was wrong. It is no secret. I just wanted to know if I can trust my wheel in the future. And I guess I can after Reading this. Thanks a lot for the info! I was stupid and I had to suffer from my stupidness, that I already know. It all went well and my wheel lost a bit of plastic and I got some scratches, but I had protection gear and it was not that bad to fall. Quite an experience. From now on I will never exceed the first beep. The thing was that I've exceeded those beeps hundreds of times during my 6 weeks and nothing has happened. But this time, It was too much and I was stupid and will never do it again. Thanks esaj for your explanation. Very well writteb. Actually, you can safely turn off the 1st and 2nd beeps - they are just indicators to let you know your respective speed. However, never ignore the 3rd alarm (5 beeps). That tells you that you are exceeding the power capability of the wheel. 3 Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted June 2, 2018 Share Posted June 2, 2018 1 hour ago, Kens said: Few more videos from Youtube for EUC face-plant awareness.. I got it from Bell Super 3R vs Giro Switchblade review thread. I've never seen that longboard race fail If you're going to race anything, don't use a Ninebot. 1 Quote Link to comment Share on other sites More sharing options...
Kens Posted June 2, 2018 Share Posted June 2, 2018 2 hours ago, Marty Backe said: I've never seen that longboard race fail If you're going to race anything, don't use a Ninebot. He over leaned too much. I wonder if the wheel even beeps at him or not. Quote Link to comment Share on other sites More sharing options...
Popular Post esaj Posted June 2, 2018 Popular Post Share Posted June 2, 2018 7 hours ago, Yffisch said: Hehe, fun comparision with the coin collecting ? But to be honest, I really thought the beeping was just for you to keep track of the speed. Like if I set the limit at 31kmh which I have now. Then first beep is 32kmh. Second is 33kmh. Third is 34kmh and continuous beeping is 35kmh which is said to be max capacity on mcm4. I did not think the vehicle itself would react to this. Just a warning what speed you are at since there is no speed display except on your phone. But you don't really have your phone up while riding. But I was wrong and knew to little about the vehicle. I'm glad people don't eat me alive for this since they are probably grown up people. Well, while this basically was a self-caused incident, it's not entirely your fault. Many wheels seem to come with either a "not too good" manual or no manual at all... Not sure where I've put the KS manual, which wasn't really bad, but not very detailed either, if memory serves. It might have have had some chapter about the warnings, but not sure, at least it explained the battery voltages for the side-leds showing the remaining charge and some other useful things. I think it was something like a Ninebot, maybe Mini manual that actually told you to store the device for a longer while with the battery fully charged (which is a horrible advice)! Unless you've watched some videos where people actually explain things, rather than just zoom around at high speeds and tell how great it is, or stumble upon this forum and read more than just a few posts here and there, you and many others are likely completely oblivious about the limitations and impending doom beyond the limits. 4 1 Quote Link to comment Share on other sites More sharing options...
Yffisch Posted June 2, 2018 Author Share Posted June 2, 2018 I agree with that manual thing. It was extremely shitty and did not really explain anything except "you are not supposed to ride in x and y and insurance bla bla and age between 18-60" things. How hard can it be to hire in an English speaking person who could just write some text. Even the english translation on the wheel itself is shitty. Bad grammar and it is misspelled and no spaces after some commas. Keith: Yes that was exactly what happened to me! It lools terrible on that movie. I had much less protective clothes than him. I was very lucky 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Scatcat Posted June 2, 2018 Popular Post Share Posted June 2, 2018 You come to understand electric motors riding a EUC. Good educational stuff really! If you’re lucky you even get to learn how it works without the amplification of a hospital bed... 2 3 Quote Link to comment Share on other sites More sharing options...
Unventor Posted June 2, 2018 Share Posted June 2, 2018 (edited) 13 hours ago, Yffisch said: I really regret my lack of knowledge but I am really happy it all went well. It is a very good vehicle, but don't do what I did. I thought the beeps was just a warning of the speed, and not actually a warning about the vehicle itself. Please, take care out there and respect thr beeps. I know that there are probably other newbies that will do the same misstake as I did. Just don't!!! As you said others will make the same mistakes either because the lag of knowledge or just simply because they get intoxicating by speed. There is a reason why road say keep shouting about speed kills.....or even at law speed compared to a car will hurt you severely. Good you had listen to wear safety gear. I am by no means an angel about speed, but let's just say a heep of "hazzards" and many years as a bicycle rider in dense city traffic have learned my more that fair share of lessons. My big warning signs are people in roadside parked cars and listning for dogs. You never know when people open a car door or a dog rushes out under or between parked cars. Now with an EUC I am learning new drinking dynamics and the road condition seem more important than ever. It seems most people here in Sweden totally ignore the fact when double g your speed you quadro the energy stored in the moving object. People are driving way to fast and to close to the car in front of the to be able to react. Now when they are using ebikes because government subsided to get people to ride bikes more you get the same speed mentality on bike lanes. That is why I thing it would by great to have a driver licenses for EUC so people get the skills up and understand they have a deadly weapon between their feets. It is by far not a toy despite many view an EUC like that at first glance. Edited June 2, 2018 by Unventor BTW forgot to note, glad you 'Ok' consdering circumstances. Note to self I really need to get motorbike jacket. Rather soon than later... 1 Quote Link to comment Share on other sites More sharing options...
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