Scott with central 8Fun

[twingolo]

Hi,

I'am building another one Ebike (for my syster this time),

not a beast, but efficient and easy to use.

The description:

Motor : 8FUN 24v sensored
Battery : 36v 9 AH 12s2p (4 x Turnigy lifepo4 4500mah)
Activation : PAS
Controller : 36v 15A : 540w
Theoric Speed : 45 kph.
Freehheel : on the crank

Just a CAD design before receving the differents parts.








more pictures later

Personnal message to Adam: great jobs on your hand made frame.

Fred

[bzhwindtalker]

Looks good Fred! how have things been? Using a hub like that gets the best of both worlds, but the chain and sprockets seem to be the weak link. Will the fork clear the battery?

Adam

[John in CR]

No room for front suspension travel, so put the batteries in the triangle, and focus primarily on the drive. Your sister has a great brother. It sounds like a great project.

[amberwolf]

As noted above, your photo's filename will come true if you use that suspension fork and that box at the same time, as soon as you hit any decent bumps:

implantation.jpg (77.6 KiB) Viewed 1583 times

Otherwise, it sure looks like a neat idea.

[twingolo]

Small or big bump, nô problem, this is a CAD picture on a phone picture, the scale is not respected.
There is enought space with this tire.

[oigoi]

How will you put the sprocket onto the rh side of the 8fun motor? These motors can have disk brake mounting holes and you can buy bolt on sprockets but the threaded holes for mounting a disk brake are on the LH side?

[twingolo]

The hub motor modified:



This one is geared and have a freewheel built-in, but no hole for a disk brake.

The 15 thooth sprocket is bolted on the side of the motor thru an home made adaptator.

[twingolo]

The come back with new picture of the parts on the bike:

Tutorial for the switche on an hydraulic brake : http://endless-sphere.com/forums/viewtopic.php?f=28&t=42477





Motor and transmition:



amberwolf, you were right, first test on a medium bump, front tire is limit to touch the box, i have to set the fork harder.

[crossbreak]

amberwolf, you were right, first test on a medium bump, front tire is limit to touch the box, i have to set the fork harder.

plz film your sister when she drives over the first curbstone

[bzhwindtalker]

Very nice! I see you modified the axle, I have a lot of problem on my "500w" BPM mid drive due to the ridiculous axle flats (12mm avec un meplat à 10mm comment transmettre du couple avec ca ) that's a very good level of intergration, but yeah the front tire clearance is asking for trouble

[spinningmagnets]

WOW! Beau travail, bravo! Please post if you run into any problems, and what you end up doing to fix everything.

[Whiplash]

You likely could use some of those head sets with the offset to increase the fork angle and give more clearance, plus it would handle better at the higher speeds!

[boostjuice]

....or upgrade to a 200mm Fork, thereby raising the clearance gap and set up compression to use about half of its travel. Personally I find most XC bikes (at higher speed) feel better with the resultant shallower head angle and raised head-tube.