First Offroad - E-Bike

[kraeuterbutter]

hmm...
i like it from concept.
looks very rugged

also mounting on a road-bike is possible

assistance up to 55km/h possible

hmm...
considering a light moutainbike with 9-10kg
the motor/gear-unit including mouting material: 2,5kg
the controller-unit + handels: 1kg
the batteries (Lipo 22,2Volt and 9000mAh): 1,3kg

that would result in a very light electric bike of only around 15kg including the batteries
it should be able to go 20-40km or 800m of altitude-meters

the only thing: there is a video on youtube.. hmm... seems to make some sound

is there somebody owning such a bike/conversion-kit...
how does it work ?

 

[flecc]

That looks like the Currie motor, and yes, it does make a buzzing sound. Normally they're used with chain drive onto the back wheel.

This same drive system is used on the English TGA Electrobike which used to be available as a kit, but is now only as a complete bike.

In both cases they are just throttle operated and drive one of either two or three chainwheels, then use all of the rear gears, hub or derailleur. A sort of poor mans Swiss Flyer!
.

 

[Miles]

Looks like it has a secondary use as a chain-saw

At least if you drive the R-hand side, you have the possibility to isolate the cranks with a freewheel.

 

[Miles]

This appears to be the motor used: Oatley Electronics

 

[kraeuterbutter]

wow...
thx..

thats a real cheap price as well !!
seems to be ideal for experimenting..

i have here an old mountain-bike
http://www.kraeuterbutter.at/Bilder2/sonstiges/Mountainbike/Bilderuebersicht1.jpg

(more detaild pics here: Index of /Bilder2/sonstiges/Mountainbike )

its a brushed-motor.. so have still some old brushed-controllers here from rc-plane lying around too
(Kontronik, rated up to 40Volt, 80A continouse, 150A peak - (also with included cruise control function *lol* ))

batts also enough to test with..

hmm... if i could get the pedals with the aditional chain and mounting material it should be possible to electrify my bike for 100-150Euro ?!?

 

[Miles]

Obscenely, cheap!

The only drawback, with this system, is that you are committed to pedal with the motor at all times - unless you use something like this to isolate the cranks: http://www.hostelshoppe.com/atp_archives/ips_instructions.pdf

The Cyclone kit uses a similar system which incorporates a Scooter freewheel rather than the BMX one used in the above.

 

[kraeuterbutter]

yes...

on the bike-elektro-antrieb.ch E-Mountainbike elektrovelo e-bike Elektrofahrrad, Tante Paula Roller, Phat Flyer, Elektro Roller, Electroscooter, E-Scooter, Elektrotrotinet, Electric - bike
they have solved it also that way..

look at the version LANZ V4 (freeride)
with Freilaufkurbel Ausführung Shimano Deore Hollowtech Octalink

with that, there are 3 free-running-units in the bike

(motor, pedals, rear)

without that i think its realy dangerous..
(considere you are driving with "fixed" feets to the pedals (don´t know how that is called ?)
and you crash... the motor is spinning, the pedals as well and your feets are connected with the pedals.. no good at all)

 

[Miles]

I wonder if their crank-isolator freewheel unit will be available separately..?

Looks like they're not really in business, yet....

 

[Jch21]

I wonder if their crank-isolator freewheel unit will be available separately..? Looks like they're not really in business, yet....

Without free weel ? Very dangerous...
Here the motor producer
Welcom to Unite Electric Motor Co., Ltd.!
and to buy it
TNC Scooters (Scooter Sales and Service)

 

[flecc]

Thanks Jch21, so my guess was right, it is the Currie motor, since I understand the Unite is what Currie use now.
.

 

[Miles]

Yes, thanks. I was looking for that website, but I was searching for it as "United Motors"....

Yes, flecc. I expect they cost Curries around $15 each.

It sounded pretty noisy on the Swiss video.... even allowing for the underground car-park acoustic...

 

[flecc]

It sounded pretty noisy on the Swiss video.... even allowing for the underground car-park acoustic...

You can also hear it in the Currie version here at the foot of the page on the video, where it tries to drown out the background music.
.

 

[Miles]

So, no problem with pedestrians not noticing you, then...

 

[flecc]

So, no problem with pedestrians not noticing you, then...

Yes, that's a serious point which I've raised before. If electric vehicles become widespread, the pedestrian accident figures will hurtle skywards if we don't stop them crossing with their ears as they so often do at present.
.

 

[coops]

Any more news on this system or anyone here tried to build an ebike based on similar? I'm thinking an offroad capable ebike would be a blast! shame we have to build them ourselves... could be a new project... though I suppose a rear wheel currie would be a simpler starting point?

Stuart.

 

[flecc]

I think the battery would need a damped suspension system, and a hub motor would really need to be ruggedised to withstand high impacts.

A good way to look after both would be to have the motor centrally driving though the chain, and the bike with quality full suspension.

There is one like this, I remember the photo, and it had the motor driving it's own chain onto a left hand freewheel, the cyclists transmission the other side as usual. Neat job, but would have been very pricey.
.

 

[coops]

Actually, when I say "offroad capable", to me that doesn't necessarily mean "all-terrain", but just more rugged than a hub motor would be (I wouldn't try it with a hub motor) and preferably approaching MTB tolerance - enough to handle rough tracks etc. though I suppose designing suspension etc. to deal with more than you expect to use it for is a good idea.

I love the idea of minimum weight motor & Li-battery, would retain the feel of an average weight bike, given proper weight distribution, which the chain drive through crank would be ideal for, if I could do it - central and low down.

Stuart.