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  #1  
Old 07-30-2012, 10:43 AM
evolutioneng evolutioneng is offline
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Default formula for a 70 mph mini bike

okay im going to make a prototype mini bike elctric.what battery cell(s) does someone recommend. which electric motor does someone recommend. 300 weight person. im going to use a centrifugal clutch for the trans. i have a battery plus store where close by so i believe ill be getting it from their if the price is right .
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  #2  
Old 07-30-2012, 01:18 PM
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Default Re: formula for a 70 mph mini bike

headways are popular for bikes, or just small prismatics. I don't imagine you could get either of those from battery plus.
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Old 07-30-2012, 01:46 PM
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Default Re: formula for a 70 mph mini bike

300lb person? going to need some power to move a bike + rider. No offence.

Use some high discharge cells, don't use lead and don't go to batteries plus, they're a ripoff for traction batteries. Order online.

Why use a clutch? Just go direct drive, there's no reason to use a clutch if you don't have multiple gears.
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Last edited by frodus; 07-30-2012 at 01:48 PM.
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Old 07-30-2012, 02:29 PM
Arlo Arlo is offline
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Default Re: formula for a 70 mph mini bike

RC lipo and a ebike hub motor would get you there. Or a 6.7 inch series motor would get you there faster! Here is what I built and I could re-gear for that speed no problem!
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Old 07-30-2012, 02:42 PM
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Default Re: formula for a 70 mph mini bike

nice wheelie hahaha. can someone send me some link on batteries also what controller if i need one im sure i do.
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Old 07-30-2012, 10:45 PM
Arlo Arlo is offline
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Default Re: formula for a 70 mph mini bike

Quote:
Originally Posted by evolutioneng View Post
nice wheelie hahaha. can someone send me some link on batteries also what controller if i need one im sure i do.
These are what I used http://www.hobbyking.com/hobbyking/s...case_pack.html


And the controller is a curtis 1204 50v 225 amp but you can open them up and add mosfets to rase the current in my case I added 11 mosfets rasing the current to 500 amps!

If you want a BLDC motor and controller it will be more expensive and you will want to search around for options. Methods and Zombies on ES are doing a 400 amp 100v 24 mosfet controller build.
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  #7  
Old 07-31-2012, 04:26 PM
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Wink Re: formula for a 70 mph mini bike

Here's a video of a big guy on a lawn tractor powered with a 48V ETECH motor. Not a minibike and certainly not 70 MPH. But a start anyway:



I like this website and they have a cool simulator where you can see the performance of various motors and conrtrollers:

http://www.ebikes.ca/simulator/

And here is a 66 MPH eBike:


Last edited by PStechPaul; 07-31-2012 at 04:42 PM.
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  #8  
Old 08-24-2012, 08:17 AM
Arlo Arlo is offline
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Default Re: formula for a 70 mph mini bike

Quote:
Originally Posted by Mcfadden View Post
Arlo did you build that thing yourself? Looks pretty cool man
Mostly... It was a kids chineese little dunebuggy/kart and I widened the front and added better shocks and re-did the roll cage.
I love it I was ripping in my yard with it a couple weeksago.
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Old 11-15-2012, 11:09 PM
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Default Re: formula for a 70 mph mini bike

you have required a big and very powterfull battery with strong cell to get enough power to run it
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  #10  
Old 11-16-2012, 09:02 AM
Arlo Arlo is offline
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Default Re: formula for a 70 mph mini bike

Quote:
Originally Posted by obsecure View Post
you have required a big and very powterfull battery with strong cell to get enough power to run it
Hobby lipo is amazing anf getting better. Just one little 1lb pac would do it for a short while ( 30 seconds- a minute or two).
Series them up for the Voltage you need and parallel them up for the range you need, I have 18pacs on my bmx it will go 60km on a charge at 35km/h or 25km at max speed 85km/h!
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Yamaha E-YSR with 15kw DIY BLDC controller!
http://www.youtube.com/watch?v=91pGd...6Y37xYFFPRdPhw
The funnest thing I have built. https://www.youtube.com/watch?v=lIsuU6LhDIE
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