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Showing most liked content on 04/04/2016 in all areas

  1. I had a great day at the Gadget Show in the NEC Birmingham yesterday where I met Steve Milton (no relation) and his team from Uniwheel. They were kind enough to bring two of the wheels outside to the car parks where my son's and I were able to give them a little bit more of a test than would have been possible in the confines of the hall. The ride felt very solid and the software gave a quick reacting but comfortable ride, I believe the ride characteristics are adjustable via the app the the one I rode felt similar to Madden Mode on my Gotways. The slim lightweight case was very com
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  2. The batteries are lower voltage, around 50v rather than the more common 60v I believe, similar to the Solowheel and being a different format I would imagine the proprietary packs would be the way to go. Here are the two wheels we got to play with in the car park. Just tested to be sure they would fit in the frunk/froot of my model S.
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  3. Hey guys, I'm so sorry it's been tough for me to keep up with the emailing promptly like you deserve. The honest truth is, in trying to be competitively priced in the market, we make very little money importing these, and it's becoming more difficult to do. This is not an excuse for delays in responses to my customers, but it's the truth. This business has turned out to be harder than it seems, and trying to do it as a second job has made it so that I haven't been to provide the level of service and communication I intended to. To be clear, right now we have 9 customers waiting for u
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  4. Here is a video of a friend and me.....some cruising at our lunch break @ work.....nothing special but perfect spring weather in bavaria!
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  5. I actually invented a whole new level of coolness, as if pushing music thourhg the speakers wasnt enough...i went to google maps on my phone and started directions to whatever destination i was going, then turned the music on...so once in a while the music would stop and the voice would say real loud...turn left in 300ft...you will reach your destination by 13-20... Go straight for a mile thene a left....the effect was phenomenal... To other people Not only was i riding a machine from the future...it also has navigation and would know where i was enough to tell me where to go....it was like a
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  6. My review of the new KS16 from KingSong ... I will say it's everything that Ninebot should have done with model P ;-) - I think it's a winner... Summary: I very pleased with the product (based on limited use).. I will say it's everything that Ninebot should have done with model P ;-) - I think it's a winner... Good stuff: It rides really well and offers a nice balance between power, comfort and stability.. Really nice design, very beautiful on the same level as Ninebot.. Material has a good feel and quality seems high.. Riding mode
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  7. Probably the very newest technology can be a bit pricey, but then again, Firewheel mainboards do use the 1.8 milliohm SMD-versions, so it shouldn't be that expensive. And probably the mainboard manufacturing price isn't that high compared to the batteries and motors. But I'm just guessing, I haven't got much idea what it costs, but still I'd expect it to be relatively cheap (when buying components & manufacturing in bulk). No idea on design & prototyping costs, though. Although it's over double, it doesn't sound much as the bridges aren't really being driven in high freq
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  8. Should be a great idea! I would really prefer better Mosfets and maybe more sophisticated heat sink to a fan... Could be eventuelly also cheaper for the manufacturer? If you look at the rise/fall times of the IRFP4368 ( 220/260 ns) against the 75NF75 (100/30 ns) it's not the big difference The Mosfet changes between non conducting to conduction (saturation) through the "lineas region". So for the fall/rise time he goes from max voltage drop/no current to min voltage drop/max current. So with every switching the Mosfet start with ~60V/0a and goes quite linear to the saturated
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  9. @tjcooper If MY or ALL wheels would behave like yours...i would stop driving EU directly and Forget this Hobby!!! I can only give you one advice: Take some more Money in the Hand and buy a good Kingsong or Gotway wheel....Get a REFUND for this CRAP mohoo! I am driving my KS14 now since about 3-4 weeks...often with a lot of power accelerations up to 30kmh/18mph(most fun at all)..and NEVER, NEVER experienced a shutoff from the wheel! This Mohoo crap seams to be a toy...not a real driving EUC! Really: Forget this Mohoo! You now experienced too much f
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  10. It's not a bad idea, and has come up from time to time. Probably the heat sink part inside the wheel casing shouldn't have any fins, though, as they'd get clogged up by mud & crap flying from the tire over time and drying in place. Firewheel actually has a large metal plate to which the mainboard & heatsink are attached to, that is next to the spinning tire (on the side, not on the top), that probably helps at least a little on heat removal (then again, there's nothing between the heatsink & plate, so I don't know how well it actually conducts heat to the plate). Compared t
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  11. More info, pictures, videos etc. about this event on *THE* french forum: https://www.espritroue.fr/topic/340-compte-rendu-rando-fontainebleau-du-03042016/?page=1
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  12. Hi Folks A couple of newbies here from Sunny Scotland wee man has an Airwheel X3 which seems perfect for younger riders. https://www.youtube.com/watch?time_continue=1&v=JwzqKbVVn2A
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  13. This whole thread is my attempt to give him a chance and let the community help influence my decision. I even tagged him so he is alerted to the discussion. Like several of you have said, I hope he's OK. However, it's a lot of money to spend on a product with such uncertainties that already exist, so it would be helpful to get some reassurance that he is on top of placing the orders and capable of getting them through customs.
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  14. So I rotated the board 180 degres and now the motor runs on the right direction, however, with to much speed that is not ridable and is dangerous. I wonder if that firmware were developed for a motor that outputs much higher frequency of hall sensors signal. On current OpenSource firmware, I tried to ride a bit with EUC with constant speed and is not possible :-) -- I think I will move again to test the balance code. Last time I were feeding the output of balance controller to the duty-cycle PWM of the motor but now I will instead output to the speed controller that will then output comma
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  15. The "switching" frequency for the "?slope/edge?" itself is in the MHz area, also the PWM frequency itself (the rectangular pulses) generated are in the tens of kHz range... If the switching itself gets too slow the dissipated power will again get way too high... ;( Ups. Yes - do much writing and not enough thinking. The Mosfet would have to magicaly change to a p-channel Mosfet (or jump on the pcb and change the drain and source connection)... ;). So for regenerative braking only the body diodes can be used with their quite high forward voltage. There only special diodes (like sch
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  16. I've seen some gyroscope stabilized gimbals for RC helicopter video, but I don't know where you would get a motorized gyroscope to experiment with. Here's some videos of the sort of concept I'm thinking about, but if one could apply it to a EUC that would be the next step. Check out this gyro stabilized monorail... So cool...
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  17. I was there and I confirm a lot of GW were there. Most important wheel event recently. And also 2 prototypes like KS 16 and GW ACM16 we could try. Very nice from resellers. Hope we will have other events like this one (Fontainebleau 2016 - Paris area).
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  18. I have made a small histogram. First sample times if they are for the same value because they may be very large if the value doesn't change. Results here Average is about 0.07 s, stdev 0.05s Most of the samples are between 0.02s and 0.06s To get 50hz means a 0.02 s sampling rate, going to 0.03 only a 20% of the samples are from this frequency. Must see if it is caused by the wheel not giving more or just values not changing too much.
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  19. I'm pretty sure that car batteries tend to have a lot more controls built into them to ensure their longevity. Tesla wouldn't guarantee their batteries for 8 years if they thought they would have to swap them out in that time. The recommendations that come with the Tesla are to only charge to 100% on odd occasions that you think you're really going to need the extra range and then to only do so immediately before setting off so that the batteries are at maximum charge for the smallest time possible. I believe even the they arent actually taken to 100% capacity. They are also heated or co
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  20. ??? Has nothing to do with PC Control boards...and it is not for cost reducing, but as adittional to the heatsink! The EUC's have some ver "fat" Mosfets...when these burn you have a very nice faceplant. Every (good) EUC has a temperature control (around 70 degrees) and it's a well known Problem for all powerful EUC's to have heat Problems on very Long climbs, on hot days even more... So to put a power fan to the board, additionally to the heat sink, i think is a good idea. As Henrik Olsen is reporting in one of his Videos....the temperature is about 10 to 15 deg
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  21. SloMo and Keith, Finally got proof of the good "unexpected stops" on video. This Sunday I was able to run the MoHoo at the park for 25 minutes. I had TWO “unexpected stops” of medium forcefullness. There are two action cameras covering the course at 90 degrees to each other so you see each stop from a different angle. Luckily both stops were captured by both cameras. These two stops are nothing like the 5 foot launch from last week, but I was also going much slower this time. I have uploaded to YouTube the results. Here are the files: firefly #1 and #2: https://youtu.be/Id8Y7
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  22. Before you do that, ask Jason first if he has stock or stock which are really on the way.
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  23. hmm, either put the board on the other side of the wheel (well, cable's probably too short), find a way to put the board upside-down (flip on the vertical axis - components towards the shell), ask microworks if there's a way to recalibrate directions, or swap two corresponding to each other pairs of motor and hall sensor cables?
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  24. Thanks! Just tried it - works great! The gpx files can be easily imported in google maps Sampling got nicely faster - i summed up all the time differences between the current samples. There are two big accumulations arount 0,035 and at 0,07 secs sampling time. These values are about 70% of all samples. Up to 0,07 max sampling time covered with version 1.0 just 37% of all samples. I thought that this should mean, that there are mostly about 14 to 28 samples per second (1/0,035 and 1/0,07) but looking at the graph it is still very edgy ;( The average sampling time was still 0,1 se
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  25. Use this tip to learn how to ride your electric unicycle backwards or in reverse... I requires some practice but you will get there eventually.. Remember to use proper protection....
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  26. What I've begun to wonder is how would it affect the heat if the wheels were using top-of-the-line newest MOSFETs. For example, 75NF75 (used at least in older Ninebot mainboards) has an Rds(on) (resistance caused by the mosfet itself when it's fully conducting) of less than 11 milliohm. But then, just as an example, International Rectifiers' IRFP4368 has Rds(on) of 1.8 milliohm, giving a staggering 350A Imax (maximum current, probably theoretical number?) vs. 80A in 75NF75. What I don't know is whether it actually could be used, as it has larger gate charge (380nC vs. max. 160nC in 75NF75). Bu
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  27. KingSong KS16 speaker volume and LED lights #thewayweride
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  28. 133 wheelers rolling out today, more than 60% of them riding GotWay. You may see many Msuper and MCM4 on the pirctures. Hurrah!
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  29. From the pictures I've seen so far, I really cannot tell. Probably the noise is quiet enough that you can't hear it (much) from inside the case, but the lifetime of the fan might be an issue. Water-cooling, while cool (pun intended ), would probably be more trouble than it's worth; if the pump dies and the system cannot keep the temperature in check without it, you end up frying your board. If the pipes break or leak for some reason (shock from a fall or such), you could end up frying your board. Passive systems, being maintenance & care free would seem to me the way to go, maybe
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  30. @KaleOsaurusRex No need to call me! Thank you for the thoughtful response. I was prepared for a lengthy wait, as I am aware of the severe shipping difficulties. I also totally understand that most of the time you can't really give us much info until it is actually through customs. The problem was that I was hearing about other distributors having their units shipped and nothing from you. All I needed to hear was that our orders are placed and things and shipping is being attempted. I'm sure this is all really stressful for you too, which is why you're now thinking of backing off of pre-or
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  31. I assume so - but all the theory i knew a long long time ago...;) Should help the mosfets. Will be interesting if you make before/afterwards measurements. In case there is really some power to be dissipated with your smaller motors do not forget to give them a heatsink too For step up converters if found this pdf http://cdn.intechopen.com/pdfs-wm/13353.pdf where maybe section 3.2 and 3.3 could be interesting for you (if you use a similar circuit). Do put a snubber circuit to the coil to take the burden of your bjt.
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  32. I have a ninebot one e +. Lewis Hamilton has the same, believe it or not, check youtube The main thing for me has been batteries. It doesn't run well when the battery is low, ie it is downright lethal. I didn't realise this when I started and ended up with some good splats. Since understanding this I haven't had any nasty issues. This is the best place for general info, browsing, learning and advice There is a lot more to these things than meets the eye. It is addictive though. Jer
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  33. @Cloud it does stand on it's own... but not very securely .... a bit of wind would knock it off...
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  34. Cheapest Wheel AND!!! Very good quality is a KS14b Wheel from futurewheel.nl for 539 Euro if you use Forum discount... fantastic wheel! Good Price...possible to Upgrade!!! Or: Gotway MCM 3 from Electro-Sport.de for 599 Euro.... also super Wheel.... Everything Else for cheaper or less Money is just a very dangerous toy!
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  35. haha are there many UK based electric unicyclists about? I haven't seen many when out and about.
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  36. I was musing dreaming of doing a bit of a tour, might take a while though. Maybe we can meet halfway? Jer
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  37. Thanks @hobby16, i received mine today!
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  38. packand cells were tested and checked yesterday, but yes I blame the battery.this it the pack when i got it from bang good. i am all good just like coming off racebike. but oh so quick. when it tilted back i was gona hop off but did not have chance. yep i am used to it tilting back at overspeed, but it then tilted forward and took off that quick my legs went higher than my head. just took before i could hop off. cut outs like normal i do not mind but this scared the hell out me. comparison would be standing still on rollerblades and someone kicks em out from under you from behind
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  39. @tjcooper First of all, I would like to congratulate you sir for your very good physical fitness at the age of 70. You look more than ten years younger. Now about the Mohoo unit, could you be able to return it and get a full refund instead of asking for a replacement board and battery pack? The reason being the motor of the Mohoo is not that powerful and the battery pack is small and even with new replacement parts, you might still experience the same shut downs in the future.
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  40. Cloud's idea of using the speaker to announce GPS direction is a great idea. One can decal the KS as a boombox or a sub-woofer, ride it around with music on. It will be interesting to see how ppl reacts to that!
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  41. These speakers are great for you to use in protest. Imagine a bunch of KS riders riding and shouting in unison through their speakers: " What do we want? Living wages. How much is it fair? 1 KS-16 per hour." We need an app for broadcasting to all these KS units.
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  42. it all depends on how you do it. Blasting music for the purpose of making everyone listen to it is obnoxious. However, riding and listening to it, just being in the groove and enjoying it can look pretty cool. I usually dance to the music while i ride the wheel. It can be something slow blueezy and doesnt have to be super loud. Moving on a wheel coordinated with the music can feel better than dancing and can be quite a spectacle.
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  43. I recently rode ks18 for a week. I am 5'-9" . For me tombe in the sitting position was very uncomfortable. When you sit on it your legs are so much forward that you are touching the pedals with your toes only - you cant really put your feet flat on the pedals. Balancing was much mire difficult because you cant really hold the plastic casing with your legs any more, so basically you have to balance your body on the seat above one point of contact of the tyre with the ground. You have a huge lever - it was tough. However i think one can get used to it, but for me standing on it was a 100 times e
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  44. Where I grew up at, people blasting music extremely loud in public is a normal daily occurrence. I don't live there anymore, but I will no doubt represent my culture by blasting music in public on my KingSong16, once I have it. Fun!
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  45. lol I have ridin one the same as second picture. you cannot drive it sitting on seat. have a look on utube they all stand on footboards when moving and those sitting quickly start standing as soon as they get going along. I actually went over the handlebars try to sit and ride. once you lean forward or backwards too much they cannot hold you up and you hit the deck with wheel still driving.
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  46. Fun stuff. Maybe I want to build one as my kid's science project: https://www.youtube.com/watch?v=jN6InB7Ok6w
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  47. hi ! I had the same problem (watch the fideo in first post) were the bolts of motor shaft....are you sure they are fixed very well ? The first time I fixed them with only my hands and tools ..and after 10 km ...again same problem. The second time I used a vise and fixed them very hard .. now after at least 50km ..jump, holes and offroad stil work well. Wheel from major brand have a little piee of metall to lock this bolt I can add something to fix it more well .
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  48. Hey @tjcooper, I've noticed you are referring to @Makoben and @SlowMo, but they could not be aware. You should type first @ and choose the name from the drop down menu.
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  49. My little Saturday adventure, grab some popcorn and relax it's a long fun ride!!
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  50. Our wheels do NOT have individual PTC for each cell. It should not (IMHO) be necessary since the BMS takes care (theorically) of imbalance, overvoltage and over-temperature and has a charge cutoff circuit. On some Firewheel's BMS, there is a polyswitch but for the whole pack (it would cut power in case of over-temperature, it's ok for an e-bike but very dangerous for a gyrowheel and must be shunted to avoid the risk of a sudden faceplant). I have heard of thermal runaways, but not at charging, only when riding, so I presume the BMS' charge monitoring feature mostly works well. BTW,
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