my racing bike and pocket bike

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c_a
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my racing bike and pocket bike

Post by c_a » Jan 04, 2011 4:28 pm

hello,

I am new in this nice forum :-)

My name is Christian, I am from germany.

Here are my projects:

lipo powered pocket bike:
http://www.youtube.com/watch?v=Yf7CZlVeFl8

http://www.epo-bike.de
110kg 34HP at the rear wheel 5kWh racing bike, topspeed 100mph/160km/h, fourth place in FIM e-Power int. Championship 2010



I am also working on other projects, but the both listed here are my favorites.

Regards!
Christian
Last edited by c_a on Jan 05, 2011 12:44 am, edited 2 times in total.

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fechter
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Re: my racing bike and pocket bike

Post by fechter » Jan 04, 2011 4:42 pm

Welcome!

I think you found the right place. You should fit right in. :twisted:
"One test is worth a thousand opinions"

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jonescg
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Re: my racing bike and pocket bike

Post by jonescg » Jan 04, 2011 6:58 pm

Nice bike! I look forward to seeing my bike hit the Aussie TTX-GP this year. It's a bit porkier than yours, but hopefully a bit more power. What's with the box where the tank normally goes?
Welcome!

Chris

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AussieJester
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Re: my racing bike and pocket bike

Post by AussieJester » Jan 04, 2011 7:11 pm

Welcome to the forum, nice looking bike i re-seized the picture for you
it was a lil large even for my 32in lcd ;-| 800x800 rez is
the max allowed IIRC..
P7232035.jpg
P7232035.jpg (84.4 KiB) Viewed 538 times
After seeing your bike Chris i'm guessing that 'box' where the tank
usually goes is full of packs, batteries are too big and bikes
too small to fit all the packs we want ain't thay LoL


KiM

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jonescg
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Re: my racing bike and pocket bike

Post by jonescg » Jan 04, 2011 7:43 pm

Yeah I don't think mine sit that high up though ;)

I need to get a tank cover made up though. The original metal tank just doesn't quite fit :(

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AussieJester
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Re: my racing bike and pocket bike

Post by AussieJester » Jan 04, 2011 7:45 pm

jonescg wrote: I need to get a tank cover made up though. The original metal tank just doesn't quite fit :(
Custom fiberglass cover would be very easy to do Chris, i have a heap of foam here could use to
shape up one, whack some glass over it dig the foam out sand him up would look the business
would of course have to have a scoop or two ;-P ;-)

KiM

c_a
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Re: my racing bike and pocket bike

Post by c_a » Jan 05, 2011 12:50 am

Hi!

The box is full of lipo packs, but it is not higher as the normal fuel tank. The cover was build for the old headway cells and cutted later.

For 2011 I want to install more cells in less room and a bit more energy, 5,4kWh in total, weight target for the total bike is <100kg. ;-)

MikeFairbanks
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Re: my racing bike and pocket bike

Post by MikeFairbanks » Jan 10, 2011 10:47 pm

Oh, now you guys went and did it!

Showing me something I didn't know really existed (miniature motorcycles that go fast).

Great. Now I have to start learning how to make one. :D
Stay frosty

c_a
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Re: my racing bike and pocket bike

Post by c_a » Jan 16, 2011 6:03 pm


c_a
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Re: my racing bike and pocket bike

Post by c_a » Feb 12, 2011 5:50 pm

pics from today:

Image

Image

Image

Image

Image

Dangle_kt
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Re: my racing bike and pocket bike

Post by Dangle_kt » Feb 13, 2011 7:37 am

Do you have any details on the pocket bike? GRC is a nice bike to build it around, and the video shows its certainly quick enough!

I Would love to see a detailed blog of the build, or if you dont have one, some details on the spec, gearing, challenges etc you found.

Thanks for sharing your bikes - top work.

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only1jake
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Re: my racing bike and pocket bike

Post by only1jake » Feb 13, 2011 1:59 pm

Now that is one clean build. Awesome bike, setup seems good too.
How long is the ride time? And how many amps does it tend to pull?
:wink:
Jake Saunders

c_a
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Re: my racing bike and pocket bike

Post by c_a » Feb 14, 2011 4:04 pm

Hi!

Riding time is 15-20min, this depends to the track and the riders weight.

I limited the current to 160Amps, before the maximum was around 188Amps ;-)

Gearing for ~70km/h is 12/70, but it has to much torque...

I will build a second with a midi chassis.

charlesfries
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Re: my racing bike and pocket bike

Post by charlesfries » Mar 20, 2012 11:33 pm

Hello Christian!

I had a question about the battery pack. You are using 4 4900ah 11.1v Li-Po batteries, correct? And you said combined, the total amps per hour is 19600 and the total volts is 44.4, correct? How do you have the batteries wired: series or parallel? I do not have much battery experience/knowledge (I'm 16), but I thought that you can't have the best of both worlds. I mean, I thought that if you wired the batteries in series that your voltage would increase but not your amps per hour, and if you wired them in parallel, the amps per hour would increase, but not the voltage? Am I missing something? Thanks!

- Charles Fries

c_a
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Re: my racing bike and pocket bike

Post by c_a » Jun 12, 2012 12:45 pm

Last weekend I was out for the race in hungary.

The germans can read the report, all others can have a look to the photos:
http://epo-bike.de/?p=404

The bike weights now 100kg with 5.2kWh lipo battery (264cells 24s11p of 5.35Ah). Topspeed around 100mph/160km/h. Range in racemode 44km.
Motor is still a brushed dc from Lynch (nearly the same as Agni), but brushless is coming soon.

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