Flying W Posted March 8, 2019 Share Posted March 8, 2019 I have high Hopes for the new kingsong. I'm hoping it can climb like the mcm5 but with a lot more range and ground clearance. The body on the mcm5 is very low, the pedals are pretty low and the tire isnt very wide but as long as it has traction it will go up some very steep trails.....I'm just not done doing it when when it needs to charge 2 Quote Link to comment Share on other sites More sharing options...
Lutalo Posted March 8, 2019 Share Posted March 8, 2019 6 hours ago, Marty Backe said: If you're looking for a new experience, buy an Mten3 Graduate to the little beast. Tooling around on the little beast would be loads of fun. Might be fun to start adding a bit of diversity to my personal collection. I have to be careful though. I heard expanding the personal collection was addictive and if I am not careful I might end up with 11 wheels in my house 3 Quote Link to comment Share on other sites More sharing options...
Mike Paolini Posted March 8, 2019 Share Posted March 8, 2019 @Lutalo 10 hours ago, Lutalo said: Sorry. No episode 2 forthcoming unless it involves gloves and a ring. Wow. Just wow on so many levels. So you got your ass whooped in the facts and details department, and rather than acknowledging, growing and learning you resort to redirection and threats of violence against the old man who schooled you. This is now the second reference you have made to violence against me - I let the first one pass, but you don't get to play the second one off as a joke or some other BS and I'm calling you out on it. Threats of violence have zero place in our society. Not online, not in the physical world, and certainly not in a forum for exchanging information. You need to work on your character. Quote Link to comment Share on other sites More sharing options...
Popular Post esaj Posted March 8, 2019 Popular Post Share Posted March 8, 2019 (edited) 22 hours ago, Heyzeus said: I'm curious, do you or @Jason McNeil , know what the burst spec and sustained spec are for the HY3712 mosfets that are on the ACM2. I was able to find this: I'm guessing that the "peak" number of 170A mentioned there is akin to the 300A sustained of the TO-247 mosfets. If so, what is the burst spec. Is the following interpretation of the terminology correct or am I missing something here: The burst spec is the amount of amps that the mosfets can handle in a short burst without blowing, and by burst I'm assuming that means something on the order of less than a second or two. Whereas the sustained spec is the amount of amps the mosfets can handle for a short sustained duration of a few seconds or more without blowing To my knowledge, the datasheet numbers are purely theoretical, usually calculated based on an "infinite" heatsink (which prevents the mosfet from ever heating above ambient temperature) in "room temperature" (typically 25C). In real-world circumstances you hit problems with cooling far below those numbers with sustained currents, especially since the wheels don't have space for huge heatsinks. A "rule of thumb" I saw somewhere also says that for example TO-220 legs can't withstands continuous current above 75A or thereabouts, yet you see TO-220 -packaged mosfets rated for (theoretical) maximum continuous currents above 100A (but they do have a note that says "silicon limited", so technically they aren't lying ) Case in point: IRF2804PBF (TO-220): https://www.infineon.com/dgdl/irf2804pbf.pdf?fileId=5546d462533600a4015355de76f818e3 Silicon limited -> theoretically it could take this, if the heatsink prevents ANY heating up of the component, and the legs didn't melt first The next value already shows the same, except for higher ambient case (=package) temperature (but still it's assumed the component won't go above 100C) Package limited -> component legs can't take more (probably a conservative value though) That said, I've used five IRF2804's in parallel for (up to) 10ms spikes pushing current above 1000A (still only around 200A per mosfet) in a spot welder, but those are short spikes and spaced at least several seconds apart, as the capacitor bank providing the high currents needs to recharge in between. With a heatsink, I calculated values for a load last year using TO-247 mosfets, I'd have to dig up my notes, but I think the maximum I could safely reach with that specific heatsink ( https://www.fischerelektronik.de/web_fischer/en_GB/heatsinks/A04/Extruded heatsinks for PCB mounting/PR/SK610_/$productCard/dimensionParameters/index.xhtml ) was about 30W, the continuous maximum current depends on voltage dropped over the mosfet. Still a bad example as the mosfets are loaded purposefully, and switching-mode applications are different anyway, in an EUC you want to minimize the losses in the mosfets, but still, the datasheet numbers cannot be attained in reality. Rather than looking at the (theoretical) maximum currents, I'd pick a component with minimal internal resistance (RdsON) and take care that the switch-on and -off is as fast as possible (without ringing), as the brunt of the power dissipation occurs during the transition to/from fully conducting. Edited March 8, 2019 by esaj 1 3 Quote Link to comment Share on other sites More sharing options...
Popular Post esaj Posted March 8, 2019 Popular Post Share Posted March 8, 2019 (edited) As for the @Lutalo vs. @Mike Paolini: knock it off, people are reporting your fighting, and I hate coming home to see X new reports to go through... Agree to disagree, I don't care who started it. If you truly hate each others guts, there's an ignore list, at the top of the page, click on the top-left corner where your avatar and username is shown with an arrow pointing down next to the name. Under Settings, you'll find the option for "Ignored users", through which you can add users to ignore. Never tried it, but I guess it won't show any posts made by users you've ignored. Probably looks different if you use a phone instead of a computer, but the option should be somewhere there too. Edited March 8, 2019 by esaj 5 2 Quote Link to comment Share on other sites More sharing options...
Unventor Posted March 8, 2019 Share Posted March 8, 2019 13 hours ago, Lutalo said: Sending me the Tesla would open up a slot @Marty Backe and add a 2000$ bill too as it has a history of being owned by world famous EUC legden (aka you) if you inket with that famous redlipstick the @Rehab1 documenten on your Mten3, then you might get $250 extra. I am sure @Lutalo would love do this as a win win for both. He gets bragging rights to owning a former owned by @Marty Backe wheel, you get a slot free to grab a new next gen wheel. And we others all get to read about it and watch new videos 😎😁🤩 2 Quote Link to comment Share on other sites More sharing options...
LonewolfSWE Posted March 8, 2019 Share Posted March 8, 2019 23 hours ago, Marty Backe said: I don't think a powerhouse 16-inch wheel from KingSong would kill the 18XL. Gotway has the 1600wh ACM2 and the 1600wh MSX. They are both long distance wheels and extremely fast but ride totally different. I can't image a 2019 performance wheel from KingSong that would be limited to 40km/h. The rumored spec's for the 16X have me excited. There's nothing like being able to take a small wheel on long distance rides, or to get lost in the mountains without worrying about running out of juice. p.s. Have you measured your MSX tire? It's actually about 19-1/2 inches I dont think ACM2 is still in production? Wasn't Tesla its successor? 1 Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted March 8, 2019 Share Posted March 8, 2019 14 hours ago, Flying W said: I have high Hopes for the new kingsong. I'm hoping it can climb like the mcm5 but with a lot more range and ground clearance. The body on the mcm5 is very low, the pedals are pretty low and the tire isnt very wide but as long as it has traction it will go up some very steep trails.....I'm just not done doing it when when it needs to charge I've confident that only another 14-inch wheel could match or beat the MCM5. It's just plain physics - a 16-inch wheel will never have the torque of a super strong 14-inch wheel. 2 Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted March 8, 2019 Share Posted March 8, 2019 40 minutes ago, LonewolfSWE said: I dont think ACM2 is still in production? Wasn't Tesla its successor? It's not, but only for the last few months. There are plenty of ACM2's to be purchased in the distribution pipeline. Quote Link to comment Share on other sites More sharing options...
meepmeepmayer Posted March 9, 2019 Share Posted March 9, 2019 14 hours ago, LonewolfSWE said: I dont think ACM2 is still in production? Wasn't Tesla its successor? The Tesla was Gotway's next 16 incher after the ACM, so it's the ACM successor. Then they quietly put a Tesla board and motor into the ACM a few months after that . It's more like an experiment or upgrade (or they simply ran out of old ACM components), it doesn't even have an official name, "ACM2" is what Speedyfeet called it where it was seen first. There also was a Tesla-ized version of the msuper V3 (which shared board and motor with the ACM), but like one month later the msuper X was announced (much better board) so it had a short career. 2 Quote Link to comment Share on other sites More sharing options...
Lutalo Posted March 9, 2019 Share Posted March 9, 2019 (edited) 19 hours ago, Unventor said: @Marty Backe and add a 2000$ bill too as it has a history of being owned by world famous EUC legden (aka you) if you inket with that famous redlipstick the @Rehab1 documenten on your Mten3, then you might get $250 extra. I am sure @Lutalo would love do this as a win win for both. He gets bragging rights to owning a former owned by @Marty Backe wheel, you get a slot free to grab a new next gen wheel. And we others all get to read about it and watch new videos 😎😁🤩 In that case I want it autographed with pair of red vintage Puma sneakers 😉👍 Edited March 9, 2019 by Lutalo Quote Link to comment Share on other sites More sharing options...
LonewolfSWE Posted March 9, 2019 Share Posted March 9, 2019 8 hours ago, meepmeepmayer said: The Tesla was Gotway's next 16 incher after the ACM, so it's the ACM successor. Then they quietly put a Tesla board and motor into the ACM a few months after that . It's more like an experiment or upgrade (or they simply ran out of old ACM components), it doesn't even have an official name, "ACM2" is what Speedyfeet called it where it was seen first. There also was a Tesla-ized version of the msuper V3 (which shared board and motor with the ACM), but like one month later the msuper X was announced (much better board) so it had a short career. Exactly my thought. 😁 Quote Link to comment Share on other sites More sharing options...
Rywokast Posted March 9, 2019 Share Posted March 9, 2019 22 hours ago, Marty Backe said: It's not, but only for the last few months. There are plenty of ACM2's to be purchased in the distribution pipeline. actually i believe theyre completely depleted now and the tesla is the only option for a 16 incher.. though there are still some old ACM V2's (1500W) available for a premium 1 Quote Link to comment Share on other sites More sharing options...
Heyzeus Posted March 9, 2019 Share Posted March 9, 2019 (edited) yeah, I was googling around for ACM2's last month to find out the new cost compared to yours and of the few I could find, it was hard to determine whether it was an acm2 or an acmv2 and I wasn't too keen on the idea of trusting some random aliexpress storefront to either A. understand the question if I asked them if it was an ACM2 they were selling or an older ACMv2. or B. Understand the question and not lie with the logic of once they have my money I can't do much about it since they are in HK or china or somewhere. I guess maybe if I paid with AMEX I could do a charge back but I've never used Aliexpress before so maybe it's safe...I don't know. Additionally when ewheels sold them they were going for $1600 new (https://www.ewheels.com/product/new-gotway-acm-acms-16-800wh1300wh/) the few I found on Aliexpress https://www.aliexpress.com/item/GOTWAY-14MCM2S-260WH-340WH-520WH-680WH-blance-car-Electric-unicycle-Speed-30/32368523979.html ( this is the ACMv2 since it's motor power is listed as 1500w)https://www.aliexpress.com/item/2018-New-model-GotWay-ACM2-Electric-unicycle-Electric-scooter-single-wheel-2000W-motor-speed-50km-h/32853749916.html (this should be the ACM2 with the tesla motor since it's motor power is listed as 2000w both are going for $2K, but one is labeled as "Outdoor body-building equipment" in the title, so do I really trust them not to fuck up the order... I don't know this site has what looks to be the ACM2 for $1694 but I've never heard of them so have no idea how reliable they are or not: http://etscooter.com/product/2018-new-model-gotway-acm2-electric-unicycle-electric-scooter-single-wheel-2000w-motor-speed50km-h-life-100km-freeshipping/ Quite the scarcity premium Edited March 9, 2019 by Heyzeus 2 Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted March 9, 2019 Share Posted March 9, 2019 1 hour ago, Heyzeus said: yeah, I was googling around for ACM2's last month to find out the new cost compared to yours and of the few I could find, it was hard to determine whether it was an acm2 or an acmv2 and I wasn't too keen on the idea of trusting some random aliexpress storefront to either A. understand the question if I asked them if it was an ACM2 they were selling or an older ACMv2. or B. Understand the question and not lie with the logic of once they have my money I can't do much about it since they are in HK or china or somewhere. I guess maybe if I paid with AMEX I could do a charge back but I've never used Aliexpress before so maybe it's safe...I don't know. Additionally when ewheels sold them they were going for $1600 new (https://www.ewheels.com/product/new-gotway-acm-acms-16-800wh1300wh/) the few I found on Aliexpress https://www.aliexpress.com/item/GOTWAY-14MCM2S-260WH-340WH-520WH-680WH-blance-car-Electric-unicycle-Speed-30/32368523979.html ( this is the ACMv2 since it's motor power is listed as 1500w)https://www.aliexpress.com/item/2018-New-model-GotWay-ACM2-Electric-unicycle-Electric-scooter-single-wheel-2000W-motor-speed-50km-h/32853749916.html (this should be the ACM2 with the tesla motor since it's motor power is listed as 2000w both are going for $2K, but one is labeled as "Outdoor body-building equipment" in the title, so do I really trust them not to fuck up the order... I don't know this site has what looks to be the ACM2 for $1694 but I've never heard of them so have no idea how reliable they are or not: http://etscooter.com/product/2018-new-model-gotway-acm2-electric-unicycle-electric-scooter-single-wheel-2000w-motor-speed50km-h-life-100km-freeshipping/ Quite the scarcity premium Quote Link to comment Share on other sites More sharing options...
Rywokast Posted March 10, 2019 Share Posted March 10, 2019 1 hour ago, Heyzeus said: yeah, I was googling around for ACM2's last month to find out the new cost compared to yours and of the few I could find, it was hard to determine whether it was an acm2 or an acmv2 and I wasn't too keen on the idea of trusting some random aliexpress storefront to either A. understand the question if I asked them if it was an ACM2 they were selling or an older ACMv2. or B. Understand the question and not lie with the logic of once they have my money I can't do much about it since they are in HK or china or somewhere. I guess maybe if I paid with AMEX I could do a charge back but I've never used Aliexpress before so maybe it's safe...I don't know. Additionally when ewheels sold them they were going for $1600 new (https://www.ewheels.com/product/new-gotway-acm-acms-16-800wh1300wh/) the few I found on Aliexpress https://www.aliexpress.com/item/GOTWAY-14MCM2S-260WH-340WH-520WH-680WH-blance-car-Electric-unicycle-Speed-30/32368523979.html ( this is the ACMv2 since it's motor power is listed as 1500w)https://www.aliexpress.com/item/2018-New-model-GotWay-ACM2-Electric-unicycle-Electric-scooter-single-wheel-2000W-motor-speed-50km-h/32853749916.html (this should be the ACM2 with the tesla motor since it's motor power is listed as 2000w both are going for $2K, but one is labeled as "Outdoor body-building equipment" in the title, so do I really trust them not to fuck up the order... I don't know this site has what looks to be the ACM2 for $1694 but I've never heard of them so have no idea how reliable they are or not: http://etscooter.com/product/2018-new-model-gotway-acm2-electric-unicycle-electric-scooter-single-wheel-2000w-motor-speed50km-h-life-100km-freeshipping/ Quite the scarcity premium actually im always in communication with chenyanming from aliexpress (green fashion), the last link you posted is them as well.. they are legit official gotway distributors and have the best prices around, ive bought like six wheels from them lol.. she informed me that in fact the ACM2 tesla motor is no longer available from them at all or anywhere that she knows of (for some reason she decided to just jack up the price instead of taking it off aliexpress, idk why). so yea, anything you would get would be the "V2" old 12 mos version with 1500 W motor, and you would be paying a premium for both cost, shipping and import because ive only ever seen them on european or russian websites lol 2 1 Quote Link to comment Share on other sites More sharing options...
Heyzeus Posted March 10, 2019 Share Posted March 10, 2019 (edited) Well, good to know you have personal experience with them, though weird that they didn't de list the product and just jacked up the price not to mention listing they still have 198 available for stock. Some of these retailers run their sites in a confusing fashion. I messaged the "greenFashion" user account on this forum once to inquire about mcm4 batteries after they made a post about having mcm4 batteries for sale and they never got back to me. Maybe they aren't active on here anymore or perhaps it was a different person running that account. Edited March 10, 2019 by Heyzeus 1 Quote Link to comment Share on other sites More sharing options...
Rywokast Posted March 10, 2019 Share Posted March 10, 2019 10 minutes ago, Heyzeus said: Well, good to know who have personal experience with them, though weird that they didn't de list the product and just jacked up the price not to mention listing they still have 198 available for stock. Some of these retailers run their sites in a confusing fashion. I messaged the "greenFashion" user account on this forum once to inquire about mcm4 batteries after they made a post about having mcm4 batteries for sale and they never got back to me. Maybe they aren't active on here anymore or perhaps it was a different person running that account. yea who the hell knows why they do weird stuff like that lol.. perhaps just to increase the chance of them coming up in a search first *shrug*. hmm, no idea about that Quote Link to comment Share on other sites More sharing options...
John Genx Corless Posted March 10, 2019 Share Posted March 10, 2019 What is the weight? If its heavier than a V8 then I'm out :-) Quote Link to comment Share on other sites More sharing options...
Rywokast Posted March 10, 2019 Share Posted March 10, 2019 18 minutes ago, John Genx Corless said: What is the weight? If its heavier than a V8 then I'm out :-) what isn't lol.. it's gonna be twice the weight 2 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Marty Backe Posted March 10, 2019 Popular Post Share Posted March 10, 2019 (edited) 3 hours ago, Rywokast said: actually im always in communication with chenyanming from aliexpress (green fashion), the last link you posted is them as well.. they are legit official gotway distributors and have the best prices around, ive bought like six wheels from them lol.. she informed me that in fact the ACM2 tesla motor is no longer available from them at all or anywhere that she knows of (for some reason she decided to just jack up the price instead of taking it off aliexpress, idk why). so yea, anything you would get would be the "V2" old 12 mos version with 1500 W motor, and you would be paying a premium for both cost, shipping and import because ive only ever seen them on european or russian websites lol I happen to know from first hand experience that a Tesla motor will work in the ACM2. I converted one of my ACMv2 ACMs to a ACM2 by installing a Tesla motor and ACM2 control board :-) Edited March 10, 2019 by Marty Backe 4 2 Quote Link to comment Share on other sites More sharing options...
LonewolfSWE Posted March 10, 2019 Share Posted March 10, 2019 2 hours ago, Marty Backe said: I happen to know from first hand experience that a Tesla motor will work in the ACM2. I converted one of my ACMv2 ACMs to a ACM2 by installing a Tesla motor and ACM2 control board :-) There is no ACM2 motor. Its the same motor and control board as the tesla I think. As written before I think maybe they used the last parts they had of the ACM and msuper, so that they could make more money than selling them as spare parts. I would love to see a new ACM in the future. 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Heyzeus Posted March 10, 2019 Popular Post Share Posted March 10, 2019 (edited) 1 hour ago, LonewolfSWE said: I would love to see a new ACM in the future. It's thicc. It's height is the same as my mcm4, its only a couple inches thicker and a few inches longer. It's short, and squat, and fat and heavy and feels grounded and is fast. I love it. Edited March 10, 2019 by Heyzeus 3 2 Quote Link to comment Share on other sites More sharing options...
Mono Posted March 10, 2019 Share Posted March 10, 2019 10 hours ago, John Genx Corless said: What is the weight? If its heavier than a V8 then I'm out :-) LOL, I think you can count yourself out for sure. The idea that weight may be a relevant factor hasn't gained a lot of attraction from EUC manufacturers lately. I guess in this forum we are in the minority. Quote Link to comment Share on other sites More sharing options...
meepmeepmayer Posted March 10, 2019 Share Posted March 10, 2019 36 minutes ago, Mono said: LOL, I think you can count yourself out for sure. The idea that weight may be a relevant factor hasn't gained a lot of attraction from EUC manufacturers lately. I guess in this forum we are in the minority. Well, low weight or good safety+speed+range, choose one option. Can't have both at stage of technical development. An easy choice to make for most people. Batteries weight what they do for now, and I guess while the motors are crazy heavy and could certainly be improved, making them even like 50% lighter by using aluminium instead of steel would be too expensive. Waiting for these light polymer solid state batteries and some lighter motor constructions... Quote Link to comment Share on other sites More sharing options...
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