Esk8 Calculator

Hi there! I am new but I thought id contribute this, I just made it for range or distance instead of speed, feel free to check it out! https://jscalc.io/calc/rdJYgcAquv9oqdcu Thanks, Clayton

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wow it looks awesome! I didn’t know about https://jscalc.io , pretty cool! :thumbsup:

my values < the range is pretty much that

by your calculator, the larger the motor pully the bigger the range. so if you go light speed you have lots of km’s https://jscalc.io/calc/rdJYgcAquv9oqdcu#{“1”:149,“2”:43,“3”:20,“5”:125,“6”:10000,“7”:10000000,“8”:1}

@Hillso So with both my calculator and the speed calculator that makevoid made if you put the massive motor gear with the tiny wheel gear it will give bad results (http://calc.esk8.it/#{“batt-type-lipo”:1,“batt-cells”:10,“motor-kv”:200,“system-efficiency”:80,“motor-pulley-teeth”:100000000,“wheel-pulley-teeth”:1,“wheel-size”:83}|) < example, this is because as long as you can get enough tork to move the board this speed is possible, but that amount of torque would be insane and unrealistic. Both calculators should work close to perfectly if you give it proper numbers to work with. The calculators do not include the torque number because most hobbyists don’t know the amount of torque they have… only the wattage. Thanks for the feed back though… Clayton

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I can’t seem to enter the cell count as a decimal. Am I missing something?

lol you have to be quick (I should fix that), but really if you’re quick (like in half a second 2 digits) and you insert a dot as decimal separator it works :smiley: sorry about that ^^

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Thanks for the tip. I figured it out. You have to enter the numbers first then go back and add in the decimal point.

even for normal numbers, I thought the lower the top speed the larger the range. 22 km for 36 km/h 30 km for 48 km/h oh I get it. it’s like that because you get to the same speed with lower voltage on higher top speed, so lower watt. but than you need higher amps so no. idk

That part is calculated using the amps, the slower you go the less amps you will pull and therefor the farther you go!

but according to your calculator the faster you go the farther you go. or I’m dumb? idk.

So glad i found this, thanks

How do you guys decide what to put in the efficiency tab?

What is this R value that eventually multiply to mph estimate?

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Anybody know what that magic number R is?

Yes, I calculated it out for you.

Original:

R = 0.00003728226
Top Speed = 4499 RPM * 82mm * pi * R * 2.25 = 19.2 MPH

Variables:

RPM
Wheel Diameter in mm (W)
Circumference(C )
C = W * PI
Gear Ratio (G)
Top Speed = RPM * C * (1/G) = mmPH

Top Speed = mmPM * 6.21371e-7 (mm/miles)* 60 (M/H) = MPH

Top Speed= RPM * W * PI * (1/G) * 6.21371e-7 (mm/miles)* 60 (M/H) = MPH
Top Speed= 4499 RPM * 82mm * PI * (1/2.25) * 6.21371e-7 (mm/miles)* 60 (M/H) = 19.20434198 MPH

Now that we know how they got MPH we know that R is:

R= 6.21371e-7 (mm/miles)* 60 (M/H) = 0.00003728226

R is the conversion form mm per minute to miles per hour.

Note: The gear ratio is 1/G. this is not clear in the equation.

Hope this helps like!

Check out the calculator i made a while back!

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Thank you! Very helpful. Also I will definitely check out your calculator :slight_smile: