Frankman Posted June 14, 2016 Share Posted June 14, 2016 Where can I buy a MCM4 here in Europe? It is also for sale on Aliexpress, do you think it could be affordable? I'm 67Kg, which model should I go for, ordinary or high speed version? Any suggestion is wellcome. Thanks. Link to comment Share on other sites More sharing options...
SlowMo Posted June 14, 2016 Share Posted June 14, 2016 Go for the HS version even if you don't ride that fast. There are several dealers in Europe like http://gotway-france.com/ and http://www.eroue.fr/monoroue-gotway-mcm4/. You can also but directly from the factory @Jane Mo or from Mr. Chen of AliExpress. Link to comment Share on other sites More sharing options...
johrhoj Posted June 14, 2016 Share Posted June 14, 2016 I agree. the HS versions will suit you. If you were much heavier, or you would do extreme off roading, I would say MS or even high torque. With your weight, you will not max out power easily. Link to comment Share on other sites More sharing options...
Frankman Posted June 14, 2016 Author Share Posted June 14, 2016 @SlowMo, @johrhoj but do you know what is the real difference between the two models? Two different motors? Perhaps one is geared? Different main board settings? Link to comment Share on other sites More sharing options...
johrhoj Posted June 14, 2016 Share Posted June 14, 2016 The difference is in the windings of the motor. This translates in the same power at lesser speeds, thus more torque. Link to comment Share on other sites More sharing options...
Frankman Posted June 14, 2016 Author Share Posted June 14, 2016 @johrhoj, so at low speed, both models can climb same incline, even if it's hard? Link to comment Share on other sites More sharing options...
johrhoj Posted June 14, 2016 Share Posted June 14, 2016 No, the available torque of the HS winding is lower. When you go steeper and steeper, you need more and more torque. Thus the HS will do less steep inclines. At the same time, when you go faster and faster (flat) you do not need the torque, but it is still available in the high torque model. The HS model will eventually be able to go faster. Your questions made me wonder if this makes one model more energy efiicient than the other. I cannot figure that out. Is there someone that knows the answer to that? Link to comment Share on other sites More sharing options...
Keith Posted June 14, 2016 Share Posted June 14, 2016 20 minutes ago, Frankman said: @SlowMo, @johrhoj but do you know what is the real difference between the two models? Two different motors? Perhaps one is geared? Different main board settings? Absolutely not geared. There are some quite active members of the Gotway team on this forum so they may well be able to give you the definitive answer. However, it is possible to wind the same physical motor in different ways, you can either have a relatively large number of turns of thinner wire or a smaller number of turns of thicker wire (in practice it is usual to still use a thinner wire but with multiple strands in parallel.) The three phases can also be connected together in a Delta configuration or "Y" (or star) configuration: http://www.electricaltechnology.org/2014/09/comparison-between-star-and-delta-connections.html. Delta will create a faster (higher maximum RPM) motor, less turns will create a higher maximum RPM motor (higher kV) and its thicker wire will allow higher current. However more turns gives much more torque. Think of it a bit like gears, lower turns is like top gear, higher turns is like first gear. 14 minutes ago, Frankman said: @johrhoj, so at low speed, both models can climb same incline, even if it's hard? No, depending upon rider weight and incline, the Gotway motors are very powerful so may be more than adequate but the high speed version will have less torque than ow speed version so less ability to handle very steep inclines and will run hotter when doing so. Link to comment Share on other sites More sharing options...
Jane Mo Posted June 14, 2016 Share Posted June 14, 2016 we have dealer in Italy now.www.gotway.it Link to comment Share on other sites More sharing options...
US69 Posted June 14, 2016 Share Posted June 14, 2016 If you decide for MCM4 from china pay Attention that you do NOT get Version 1! The pedals are lower on the ground and some more not so nice things! So better go for MCM4 HS which is always Version 2 with higher pedals and more room for the wheel in the case..... here in Europe it is even hard to get a "Not HS" Version...as the old VS1 are almost sold out.... here: http://www.eroue.fr/categorie-produit/monocycles-electriques/gotway/ or here: http://www.electro-sport.de/epages/78292882.sf/de_DE/?ObjectPath=/Shops/78292882/Products/"Gotway MCM4" Link to comment Share on other sites More sharing options...
Keith Posted June 14, 2016 Share Posted June 14, 2016 4 minutes ago, johrhoj said: Your questions made me wonder if this makes one model more energy efiicient than the other. I cannot figure that out. Is there someone that knows the answer to that? Brushless motors have greatest efficiency at around 80% of no load speed (I.e. If the kV is 100 and the applied voltage is 50V then theoretical no load speed is 100x50 = 5000RPM so best efficiency will be when the motor at full power is loaded down to 80% which equals 4000RPM. If a higher torque version is (say) 75kV then best efficiency will come at (75x50V)x80% = 3000RPM. Also the higher kV motor has less back EMF and thicker wire so more current will flow at lower speeds than the lower kV motor. Given that air resistance friction, etc increases with the square of the speed. The high torque, lower kV motor will be more efficient when operating at its slower optimum speed than he higher kV motor. But the high speed one will reach a higher speed safely and will be more efficient at higher speeds. Link to comment Share on other sites More sharing options...
US69 Posted June 14, 2016 Share Posted June 14, 2016 10 minutes ago, Jane Mo said: we have dealer in Italy now.www.gotway.it On this Website you can buy very nice solowheels :-) No mention on gotways at all...... Link to comment Share on other sites More sharing options...
Jane Mo Posted June 14, 2016 Share Posted June 14, 2016 1 minute ago, KingSong69 said: On this Website you can buy very nice solowheels :-) No mention on gotways at all...... version 1 has already stopped produce,all mcm4 now are the latest version. for the website, they are also our dealer, and they are from italy. Link to comment Share on other sites More sharing options...
johrhoj Posted June 14, 2016 Share Posted June 14, 2016 52 minutes ago, Keith said: Given that air resistance friction, etc increases with the square of the speed. The high torque, lower kV motor will be more efficient when operating at its slower optimum speed than he higher kV motor. But the high speed one will reach a higher speed safely and will be more efficient at higher speeds. I conclude from this, that when you do not intend to do high speeds, you better get the high torque version. This would be more energy-efficient. What about the safety margin? I would guess that the reserve-torque you have gives you the same safety margin as the speed-reserve on the HS version. Link to comment Share on other sites More sharing options...
Frankman Posted June 14, 2016 Author Share Posted June 14, 2016 @Jane Mo, is there any way to distinguish one model from another (ordinary version from high speed version) apart of what the seller declares? Link to comment Share on other sites More sharing options...
Jane Mo Posted June 14, 2016 Share Posted June 14, 2016 13 minutes ago, Frankman said: @Jane Mo, is there any way to distinguish one model from another (ordinary version from high speed version) apart of what the seller declares? you can see from the motor serial number. for example, the photo is mid speed for msuper. Link to comment Share on other sites More sharing options...
sbouju Posted June 14, 2016 Share Posted June 14, 2016 In my opinion, it is only for the MSuper that exist 3 models (HS, MS & HT); but for the MCM4, only one model exists, if we omit the (pre-)version with the bad pedals and case, even if some stocks of it remain here or there. Link to comment Share on other sites More sharing options...
Jane Mo Posted June 16, 2016 Share Posted June 16, 2016 On 2016/6/15 at 3:21 AM, sbouju said: In my opinion, it is only for the MSuper that exist 3 models (HS, MS & HT); but for the MCM4, only one model exists, if we omit the (pre-)version with the bad pedals and case, even if some stocks of it remain here or there. MCM 4 has HS and HT,2 versions Link to comment Share on other sites More sharing options...
Frankman Posted June 16, 2016 Author Share Posted June 16, 2016 @Jane Mo, I contacted www.gotway.it, they said that are testing your unicycles for now, but not even sell. They invited me to test your unicycles, so in the next few days I'll meet them for a test drive. I'll let you know my opinions and impressions. Link to comment Share on other sites More sharing options...
Jane Mo Posted June 16, 2016 Share Posted June 16, 2016 25 minutes ago, Frankman said: @Jane Mo, I contacted www.gotway.it, they said that are testing your unicycles for now, but not even sell. They invited me to test your unicycles, so in the next few days I'll meet them for a test drive. I'll let you know my opinions and impressions. thank you and enjoy your riding. Link to comment Share on other sites More sharing options...
sbouju Posted June 16, 2016 Share Posted June 16, 2016 2 hours ago, Jane Mo said: MCM 4 has HS and HT,2 versions Thank you for this info ! As I am not a facebook member, may be I miss important things? Link to comment Share on other sites More sharing options...
Jane Mo Posted June 16, 2016 Share Posted June 16, 2016 5 hours ago, sbouju said: Thank you for this info ! As I am not a facebook member, may be I miss important things? haha you can also follow our weibo/my linked in. Link to comment Share on other sites More sharing options...
hyiu00 Posted September 14, 2016 Share Posted September 14, 2016 Seems like Gotway has stopped selling the normal version. Why is it? Link to comment Share on other sites More sharing options...
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