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  #41  
Old 01-18-2020, 06:40 AM
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Originally Posted by Bmr4Karts View Post
One 48v brushless motor will have this going 30mph.
How do you figure that?

A while back I tested a 1,000W brushed motor & also a 1,800W brushless motor on e-Lemon-aid
…& I didn't really notice that much of a difference in power
http://www.diygokarts.com/vb/showthr...t=37442&page=2

IMO no where near double or twice the power
…& 48V can/will only create so many RPM's

IIRC it's usually in the ~70 RPM's per volt range (brushed or brushless)
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  #42  
Old 01-18-2020, 07:57 AM
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Quote:
Originally Posted by Functional Artist View Post
How do you figure that?

A while back I tested a 1,000W brushed motor & also a 1,800W brushless motor on e-Lemon-aid
…& I didn't really notice that much of a difference in power
http://www.diygokarts.com/vb/showthr...t=37442&page=2

IMO no where near double or twice the power
…& 48V can/will only create so many RPM's

IIRC it's usually in the ~70 RPM's per volt range (brushed or brushless)
Up the voltage to about 52v and the brushless motor has enough power to propel just over 300lbs to 30mph with proper gearing. 54v would also work using four 12v batteries and one 6 volt in series.

---------- Post added at 09:57 AM ---------- Previous post was at 09:53 AM ----------

Here's 26mph with on 48v and a 210lb rider. 30 is obtainable at 48v with a lighter rider and gearing change. 30 may even be obtainable with the heavier rider.

https://youtu.be/tMOWlBDe9RI
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  #43  
Old 01-18-2020, 08:33 AM
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Quote:
Originally Posted by Bmr4Karts View Post
Up the voltage to about 52v and the brushless motor has enough power to propel just over 300lbs to 30mph with proper gearing. 54v would also work using four 12v batteries and one 6 volt in series.

---------- Post added at 09:57 AM ---------- Previous post was at 09:53 AM ----------

Here's 26mph with on 48v and a 210lb rider. 30 is obtainable at 48v with a lighter rider and gearing change. 30 may even be obtainable with the heavier rider.

https://youtu.be/tMOWlBDe9RI
The (4) 12V 12AH SLA's on ElMini are ~54V when fully charged
…& 21MPH is the top speed, that I "documented", using a GPS

Adding an 'oddball cell" to a battery pack (a 6V to a set of 12V's)
...just makes for an unbalanced/hard to charge pack

IMO OK to play/experiment with
…but, not a good/long term plan/design

I'm kinda skeptical about that guys claims
...he didn't show it in action (at any speed)
…&/or what "instrument" he used to "test" the speed? (says he used a GPS)
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  #44  
Old 01-18-2020, 12:42 PM
Bmr4Karts Bmr4Karts is offline
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That's fine. I GPS'd my Razor Dune Buggy at 34mph but I was running over 60v (16s lithium) through the 48v motor. I still had plenty of torque for getting up the grades in my neighborhood. With the same gearing I was going high 20s on 14s.

I have to slow for turns in this tiny kart.

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  #45  
Old 01-19-2020, 10:16 AM
Bmr4Karts Bmr4Karts is offline
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Quote:
Originally Posted by Functional Artist View Post
The (4) 12V 12AH SLA's on ElMini are ~54V when fully charged
…& 21MPH is the top speed, that I "documented", using a GPS

Adding an 'oddball cell" to a battery pack (a 6V to a set of 12V's)
...just makes for an unbalanced/hard to charge pack

IMO OK to play/experiment with
…but, not a good/long term plan/design

I'm kinda skeptical about that guys claims
...he didn't show it in action (at any speed)
…&/or what "instrument" he used to "test" the speed? (says he used a GPS)
Here's the video I was looking for. Has all the detail you could ever ask for including test footage showing the GPS (28mph). The video is almost an hour long so skip to the end for GPS footage if you so choose to.

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