Ben's Electric Bike. - RC-Monster Forums

brushlessboy16 · **Ben's Electric Bike. -** 06.10.2009, 07:48 AM

Well Here it is, starting the project off with a 20in Redline Bmx Bike.. All steel frame etc. Its a nice bike to begin with, steel frame and some decent wheels.

To power it I have one of these big ass brushed electric motors that i have laying around- and a 16:1 gear reduction box. Also picked up some 35 chain and sprokets for drive... BrianG- your gearing calculator is a life saver.. have it spec'd out at 22mph on 6s lipo. with low gearing and lots of reduction it should keep amp draw relatively low.

Just a project to get me from point A to point B being as lazy as possible.

Planning on making a steel subframe/ motor mount and weld it to the existing frame.

Pictures will be up later today.

brushlessboy16 · 10:14 AM

Here is the bike..

Is there any way to directly control a speed controller with something like a potentiometer?

I can get a twist grip for an electric scooter if there is any way make it work.

if not, does anyone have or know how to make a cheap servo tester?

lutach · 06.10.2009, 10:13 AM

"Bad lutach first"

You know what's coming for you Ben

.

No Ben, don't do it. Steel is much harder then aluminum and if it bends, it'll be much harder to bend it back to it's original place

. So have you fixed you mount yet

.

"Good lutach second"

There are some very intelligent guys in the forum who has vast experience with such a project. I'm sure they'll be here guiding you.

Metallover · 06.10.2009, 11:54 AM

You can use a servo tester for controlling the speed controller if you have an rc type controller.

lincpimp · 06.10.2009, 11:57 AM

Metalman had a link to a twist grip control that would run a rc type esc. Can't remember where he had it though.

brushlessboy16 · 06.10.2009, 12:21 PM

Quote:

Originally Posted by lutach

"Bad lutach first"

You know what's coming for you Ben

.

No Ben, don't do it. Steel is much harder then aluminum and if it bends, it'll be much harder to bend it back to it's original place

. So have you fixed you mount yet

.

"Good lutach second"

There are some very intelligent guys in the forum who has vast experience with such a project. I'm sure they'll be here guiding you.

Thanks luciano, but i have no problems with steel, it will be built with braces etc to stop from bending..

Quote:

Originally Posted by Metallover

You can use a servo tester for controlling the speed controller if you have an rc type controller.

I know I can, but twist grip would be pretty neat

Quote:

Originally Posted by nitrostarter

I was in Academy Sports this past Saturday and stumbled upon the battery powered bicycles for him and her. They use a brushed motor like the electrics scooters do. They just basically adapted the scooter setup onto a bicycle.

Yea, but the speed controllers they use are not as efficient or powerful as any Rc controllers. Im probably gonna use my MMM for the moment in this one.

Quote:

Originally Posted by lincpimp

Metalman had a link to a twist grip control that would run a rc type esc. Can't remember where he had it though.

A searchin' I will go.

THanks for the info guys.

Now, since i want to retain the stock pedal system- would i be able to set a slight drag brake on the MMM and use the regenerative abilities of the speed control to recharge the batteries? I dont know how much power the regen braking actually saves..

nitrostarter · 06.10.2009, 12:03 PM

I was in Academy Sports this past Saturday and stumbled upon the battery powered bicycles for him and her. They use a brushed motor like the electrics scooters do. They just basically adapted the scooter setup onto a bicycle.

Arct1k · 06.10.2009, 12:57 PM

I can't wait to read the plea to castle to replace your MMM when you fry it - lol

_paralyzed_ · 06.10.2009, 02:04 PM

"my e-bike shouldn't void the warranty, I only ran it on 6s...."

skellyo · 06.10.2009, 03:23 PM

http://holmeshobbies.com/home.php?cat=20

06.10.2009, 03:26 PM

i cant wait to see this!

florianz · **velosolex -** 06.10.2009, 04:28 PM

hey,

look at this:
http://motorbike-search-engine.co.uk...solex_5000.jpg

put the motor and the electronics to the front; batteries into the center of the frame. you will need a big outrunner, at hobbyking they have som 8cm monsters with about 250 r/min.

you could design a mount, where the motor gets - by pulling a lever - contact to the tire. so when you don't want to use the motor, no problem when going downhill very fast.

they have now designed a e-velosolex:

anyways, cool idea, btw!!!!

just recently I saw a high-end e-bike on tv, fast like a motorbike.

brushless rulez

BrianG · 06.10.2009, 04:42 PM

I'm not sure if they have this, but it would be neat to have a motor setup so that the more force you put on the pedals, the more motor assist there is. And you could set the relative assist amount. Wouldn't need a manual throttle this way.

brushlessboy16 · 06.10.2009, 05:43 PM

hmm if you were to have a pressure sensitive potentiometer, on the pedal and have a proportional value applied to the speed controller.

Does anyone know if I can run two seperate speed control in series to a motor- like 4s on each for 8s to the motor... its brushed.

trev3813 · 06.12.2009, 10:10 PM

Quote:

Originally Posted by brushlessboy16

hmm if you were to have a pressure sensitive potentiometer, on the pedal and have a proportional value applied to the speed controller.

Does anyone know if I can run two seperate speed control in series to a motor- like 4s on each for 8s to the motor... its brushed.

I know for a fact you can't. I tried on my Brushed rs4, both esc's burned up instantly when applied throttle. Nice project ben, I put a weed eater motor on a chopper. Been crusin around on that.