Cloud Posted July 31, 2016 Share Posted July 31, 2016 Let me just start out by saying that i think I am a genius, well maybe not a major genious, like @esaj, who is basically the Albert Einstein of electric unicycling, but maybe just a minor kind of genius on a local scale, but with a little bit of a vision lol. Well now that y'all are aware of that, let me get to the point Lol I'd like to propose a parameter to assess the condition of a used EUC, considering the wear and tear on it. ( as well as a longevity of a new EUC) . Simply stating the mileage ridden does not cut it, as there any other important factors like the rider's weight etc that play a major role. To immortalize my name I propose naming it the CLOUD's FACTOR (or CF) ( which can be further described as SIMPLE CLOUD's FACTOR (SCF) as oposed to COMPLEX CLOUD's FACTOR ( CCF) described further below). All joking aside, i believe this coefficient will be very useful for many purposes. SIMPLE CLOUD's FACTOR (CF) KM - kilometers traveled. This is self explanatory. This affects wear and tear on the wheel W(r) - Rider's Weight (kg) - From my own experience riders weight plays a major role in the wear and tear of the wheel. It affects the load on the motor shaft, bearings, pedal construction, it also affects the amount of the current run through the electronic components, and the temperature of components which can cause overheating etc. D(w) - Wheel's Diameter Wheel of bigger diameter have less revolutions per km traveled, than the smaller wheel and as such the wear on each component is less with bigger size wheels. Also smaller wheels simply have a smaller surface area subjected to the same amout of wear and tear. Technically the circumference of the bigger wheel would be Pi times ( 3 times ) the diameter, however the bigger wheel has more components that could potentially break, so for the purpose of the formula we emperically use a factor of 2 to describe the probability of failure is a wheel half the diameter of another wheel. To make the the factor more user- friendly, we will divide by 1000, so that the result is a 2 - digit number convenient to deal with. We will use kg, km, and inches in this emperical formula so as to express thru familiar parameters and the ones the manufacturers operate with SCF = KM * W(r) / D(w) / 1,000 ( Simple Cloud's Factor = kilometers traveled multiplied by riders weigt ( in kg) divided by the wheel diameter ( in inches) and divided by a 1,000. This should be convenient when describing / selling used wheel as well as to assess wheel longevity. The SCF will end up being from 0 to 100 and in rare cases >100, with most numbers from 0 to 50 and can include one digit after the decimal point. Someone barely using the wheel for 100km weighing 70 kg on a 14" wheel will have a SCf of 0.5. ( 100* 70/14/1000) A100kg person somehow squeezing 10,000 km out of his10 inch Gotway, will have the SCF of 100. (10,000* 100/10/1000). Some average user, having ridden a 16 inch ninebot for 1000 km, weighing 80kg will have the SCF of 5 (1,000 * 80 /16 / 1000). the resulting SCFs can be conveniently divided into several categories to perceive and assess the euc condition. 0 - 1 Barely used 1 - 2.5 Lightly used 2.5 - 5 Moderately used 5 - 20. Fairly used 20 - 50 Heavily used 50 - 100 Overused ( these can be adjusted as the euc insudstry and the euc quality develops) EUC longevity EUC longevity can be then convenienty described using the SCF to compare the longevity of different wheels. As the market stands now, if a wheel , for example, can be characterized with a Maximum SCF (max) of 100, its a pretty good and durable wheel. This parameter would be good to see published as part of the new wheels specs and will reflect the new wheels longevity in close to ideal conditions. COMPLEX CLOUD's FACTOR SCF can be used for simplicity and easy of calculating as well as to express a new Euc longevity in near ideal conditions. In real life though, we know that the terrain (T) affects the wear imposed on a euc. Also the riding style can affect the wear and tear, as well the predominant cruising speed V(pc). Higher speed increases the effect of hits and increases vibration, hence Vc - speed coefficient. ( for simplicity, i didnt separate the effect of Terrain and Riding style) COMPLEX CLOUD's FACTOR (CCF) = Tc * Vc * SCF ( terrain (riding style) coefficient multiplied by speed coefficient multiplied by the Simple Cloud's Factor Tc - terrain coefficient equals 1 for smooth pavement with only ocasional sidewalk ramps and pavement irregularities. In this case the SCF will equal CCF. For more irregular terrain the following can be used for Tc value: Super smooth perfect pavement with most riding done in mild riding style in Tc = 0.8 Smooth enough pavement with ocasional ramp, rare irregularities and mild riding style Tc= 1 Not so smooth pavement with sidewalk ramps, sidewalk riding , especially with not purfect pavement, moderate ocasional hills Tc = 1.3 Rough Pavement with irregularities, small potholes, frequent bumps, change in elevation, and a share of hills, ocasional tricks, Tc = 1.6-1.7 Grass, unpaved areas, some potholes, bumps, trics and frivolous riding style Tc= 2.0 Dirt, extreme riding , snow , aggressive riding style, tricks ( or if you are @EUC Extreme lol) Tc= > 3 Speed coefficient Vc is calculated as follows: Vc= 1+ (V(pc) - Vmax/2) / V max, where Vmax is maximum achievable under load speed by manufacturer ( i e max tiltback speed). For someone predominantly cruising at half the max speed Vc will equal 1 and all other parameters beig equal , CCF will be the same as SCF. Someone traveling at max speed will yield the speed coefficient at 1.5 which will produce the CCF 1.5 higher than SCF, which reflect the forecast of the relative longevity between the two wheels. For V(pc) less than Vmax/2, assume V(pc) = Vmax/2 As the euc industry develops, and more stats are collected correlating the euc longevity / failures with the speed and miles traveled, riders weight, etc , these formulars can be fine tuned. As of now, this may become a very convenient emperical parameter to describe the wheels condition and quality. id like to get to the point that SCF and CCF become so commonly used that no sale of a used euc will be taken seriously without listing its CCF and the manufacturers start listing Max. SCF as part of the new wheel specs. opinions welcome. Link to comment Share on other sites More sharing options...
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