Super sized stand-up Scooter project. Build thread

[E-racer]

why not revise the pivot point as the shaft of a jack shaft? A bearing hoding 2 gears on that shaft would allow a chain from the motor to the pivot, and a chain from the pivot to the back wheel, eliminating chain stretch during suspension movement, and the stresses a drive chain under tension would give an idler.

I don't have an illistration, but it's how some DH bikes, along with the Stealth Bomber Ebike do it. 2 chains, and the suspension point is also a jackshaft.

I like that thought as well. The issue is see with it is that you will have to keep two chains tensioned properly.

[Goped ESR750]

Should the two sprockets move with the suspension or be able to move independently? This is doable, the chain would have to be over the top sprocket not under it though.

Jack shaft isnt really doable would be as good as starting again to be able to achieve that now. It doesn't need to be perfect engineering solution, Is running the chain under with a slack chain and tensioner really so bad, because looks far better.

[Goped ESR750]

Realise what you mean now. Two sprockets pivot with the swing on the same pivot point to maintain chain distance. The only difference is that the chain should be running over the top of the top sprocket? Is this correct?

[Goped ESR750]

The idler carrier rotates on the same axis as your suspension knukle. The idlers contrain tthe chain to the same width as the motor drive sproket. This allows the swing arm to move up and down without tighteneing or loosening the chain. Essentially this design does the same thing as adding a double sproket on the pivot axis and doing a 2 chain jackshaft setup.

Something like this?

[amberwolf]

@Goped ESR750: All your photobucket images are currently unavailable; it says "bandwidth exceeded". If you want them to always be available to thread viewers, I recommend adding them directly to the posts in the thread as attachments. You can still leave the PB versions in the thread too, then just stick the attached copies on at the end of each post as "backups". You don't have to place them inline.

[Goped ESR750]

Should be fixed now. Thanks for the advice, I'll try then when I got some time.

[E-racer]

Wow! You have been busy. That is not quite what I had thought of. I did not realize at the the top of the suspension the knuckle was higher than the chain (granted chain was pulled tight/straight). Does it work how it is setup now? Ideally you need to constrain the chain to the width of the drive sprocket at the knuckle.

[Goped ESR750]

Tensioner seems to works, have not had a real test on it yet as I still have nothing to power the scooter with. I think the tensioner works better if it is tight with the top sprocket before 12 o clock. Have had a busy few weeks. Got new hoses for the brakes, and bled them. Only to find that the rear hose is too short, I ordered replacement ones for the scooter I took the brakes off, I think where I need to run the hose low it makes the route further than it would of been on the scooter. Need to order a 2.5m custom hose and replace the rear line.

Have ordered the majority of the electrics now. I am using turnigy 8s 5AH nanotechs. The configuration should be 2s4p giving me 60volts and 20AH. The monitoring system is two handlebar mounted cell logs. One for each bank of parrelled batteries. These means that each the cell log will monitor four paralleled cells.

The banks will be charged in the same manner. Am using amphenol plugs for the monitoring and balance circuit. Will simply unplug to switch the cell logs off. Similarly the same port on the battery box will be used to balance during charge.

I hope for a four mile range. I opted for two chargers so I can charge both packs at the same time. They are 10AH charges so should be looking at a very quick charging time.

Have not yet received the batteries which is unfortunate as I want to start work on the battery boxes. This is pretty much all that needs to be done to finish the frame. I cut out the deck with my plasma cutter today, used the original go ped decks as a guide. Which makes my decks the width of the nozzle larger than the original go ped. Think space may still be a little tight, especially as the controller is a lot bigger than the last one I used. I selected the waterproofing tab on the controller and plan on mounting underneath the motor mount, external to the battery boxes. Or on top of a rear mud guard if make one.

Got three weeks off work now so progress should be quick.

Here is a few pictures of where I am at.

[Goped ESR750]

Been doing some electric work today. Soldered a few sockets and crimped the other end to fit the cell logs.

Also made up one end of the monitoring plugs. I have ordered some stainless steel braided sheath to go other the cable to make it look better, so won't make the other ends off until this arrives.

The controller needed two led's on the display, so added these too.

Few pictures of what I got.

[Goped ESR750]

Been working on finishing the electric for the dash box. Added a pot to adjust the regen, a key switch and a small switch that put a pre charge resistor across the contacts. In the manual it just shows in the diagram it always being on, but it draws 10W so decided to make it switched. Just push it for a few seconds before I turn the key to bring the main contactor in, this stops any sparking.

Few pictures of the set-up.

[Goped ESR750]

Been working on making a mud guard today. Took quite some time cutting all the pieces then welding together, but am pretty happy with it now. I am still not sure where I am going to mount the controller so have made the mud guard as a possible place to mount.

The mud guard is attached to the swing arm, and as the knuckle was the pivot point of the suspension I was able to go very close to the knuckle with the mud guard without any risk of it hitting.

Also got some deliveries today; the power supply and braided sheath for the cables. Went for a 50Amp power supply. This should be just about right for powering the two controller at the same time. They are rated 300W each at 13.8V

Cables going to look much better sheathed with the stainless steel braiding. Nobody will know that it is actually only a tiny 7mm 9 core control cable. Have to run a single core for the third socket as I have had to use all 10 contacts so this will hide that too.

Here is a few pictures of todays progress.

[Goped ESR750]

Went and grabbed some more material today to finish securing the deck. Used 40mm x 6mm flat bar with 16mm OD Tube welded on the ended, the tube is only 20mm in length but has two nuts welded either end which take it up to 40mm. The battery boxes will secure first from underneath using the bottom nuts, the tops nuts hold the deck in place and close the battery boxes to the elements.

Have not made the battery boxes yet, the batteries should arrive tomorrow and I already have the material. I am using 2mm steel sheet for the battery boxes. My plasma cutter should make an easy job of cutting the material to the required size. Then I will just weld the pieces together.

Here is a few pictures of my progress.

[Goped ESR750]

Been working on the battery boxes today. Cut the panels out in under 5 mins, spent the rest of the day welding and finishing. Am happy with the box and how it mounts. It is actually two separate boxes, I welded a strip in the middle to reinforce them slightly. The boxes fit four 8 series 5AH Nano tech batteries in each side. They will be a snug fit, have foam pads that will be stuck on all over to keep them in place. Hopefully have left enough space to fit the two sockets which are needed on each battery box to charge each bank.

The series loop which doubles the pack voltage will have a high current isolator on in. This is because the charger would not allow the packs to be charge individually others wise. My last scooter had this issue, and I had to charge each pack one at a time.

Got the batteries today too. They turned up with very short balance wires with two 4s plugs on them, I was expected a single 8s plug. Have to lengthen all the connections and replace the two 4s plugs with 8 series single plug. This means making off 72 connections just to get the batteries right. I think by the end of the wiring I would of soldered around 150 connections.

Started on the connections and made the first four packs off with the extension and replaced with the 9 way JST plug, now I can read all 8 cells at once on the cell log.

Tomorrow, I will be focusing mainly on wiring. The frame is pretty much done now. The only further thing I can think off is a kick stand and some sort of locking loop to attach a lock too.

Here is a few pictures of where I at. The bolt underneath the battery box has spacer on it as it is too long, need to get proper length bolts but just using what I have to had to try it.

[Goped ESR750]

Drilled the required holes in the battery box for the two sockets needed. Mounted the charge power to the rear of the battery box on the side, I mounted the balance sockets to the front of the battery box. This is so the cables naturally head towards the handlebars, for the display. Been fiddling around added foam pads and trying to get it all to fit. Thinks I have just about managed it. Ran out of heat shrink, so had to stop for the night. Have 5 of the batteries balance leads lengthened plus made up one of the parallel boards but have also run out of pcb headers. Got to order some extra crimps, most of the things should be here monday. The heat shrink I will grab tomorrow and carry on with the wiring. Won't be able to get anything going until I have made the other balance boards but these won't be despatched until Tuesday.

I have lots to get one with though so shouldn't hold me up. Got to figure out where to mount the controller, think im going to settle for the mudguard. Which only leaves the huge contactor to find a home for. The series isolater is going to located on the top right of the deck, its spring loaded and will easily shut off with a nice kick if I get in trouble, this will drop pack voltage to 30V killing the controller and dropping the main contactor.

Here is a few pictures of where I am at.

[Punx0r]

Excellent

[Goped ESR750]

Thanks Punx0r glad you like the build.

Had to remake the battery boxes. Standing them on the side reduced the height of the box but made the particular awkward to work with, I just couldn't seem to get everything to sit nicely. Made a better job of the second boxes. Felt I could also do away with the middle piece and actually have them as two boxes. Everything fits better now.

Made of some of the cables and sheathed them with the stainless braid. There will be 6 sheathed cables running down the scooter. The sheath really improves the look, will look like some huge power cables, but actually inside is just control cables. The cables which come from the controller are made of to an amphenol plug. This will then go through a small box, basically there will be four sockets on the box. This will allow me to transfer from the controller plugs and configuration to send everything to their appropriate place out the other end. Have yet to make this box but won't take long as will only be small.

Still yet to mount controller or contactor. This job is really alot bigger than I imagine. I been up to 2am most nights soldering connections, 8 x 8 series batteries means everything is multiplied from my last build, used 20m of 1.5mm heat shrink, plus all the other sized heat shrink I have used. Nearly done a whole roll of solder too. I think I am about 75% through the electrics. Hope to have the project running by the weekend.

Here is a couple pics of where I am at.

[steelmesh]

I wish you had a tig and added some alum stuff =)

[Goped ESR750]

So do I. I am sure I will one day. Another learning curve for sure.

Finally got this running today. This is seriously fast!!! I have clocked 46mph so far on GPS. Have not looked at controller settings yet to know what it's putting out as default. Not sure if I have hit WOT throttle yet. It certainly felt like 60mph not 46mph

I have an issue. When I made the test chain up I ground head of the pin and punched it out, but not all the way I then used the same pin to complete the chain link not using a split link. Now that I wanted to use the drive chain for test ride I used the split link, which wraps the tensioner too far around the knuckle. Its ridable but this is slight marking when the must of been chain rub because of this.

A longer arm to hold the bottom tensioner sprocket should resolve this, or a complete chain made up without a split link.

I have couple pictures of completed frame as I rode it. Will try to get video done, before I strip it ready for powder coat. Pretty much looking like a success. Obviously a few minor issue to iron out, but am pretty happy with the results.

[VoKuS]

Wow looks amazing!

I love this build so much!

Is their a reason the wires are facing out from the controller?

Is it possible to turn the controller around and hide the wires under the frame, between the battery boxes?

Just wondering!

[etard]

Badass!! How is the handling? I like what you did here man, it definately is a grown up's stand up!

Solid wiring job too, stainless lines look nice.

[Goped ESR750]

Thanks for the replies. Glad you like my project.

The reason for the controller facing outwards is because the high current bus bars would be pivoting into the suspension knuckle. It's quite ugly in terms of cable routing. The current leads I fed between the boxes, I am considering doing that with the two cables that come out of the junction box. I would have to secure the one that is sheathed and add insulation as the 400amp fuse holder is bolted to a plate I welded down there too.

It handles really well, the speed really gets the blood flowing. It's not as nimble as a goped, but I feel it is probably more easy to handle than the original 50cc, although I never rode that. All the weight is pretty low down with this so assume that helps.

[Punx0r]

I'd love to see a video on this thing at full throttle

[VoKuS]

Im so inspired by this build! And I want to replicate it!

When you are done, do a review, and let us know what you like dont like...

[VoKuS]

No more updates?

Maby he got cough by police on the freeway overtaking other cars ahahahahah!...

[Goped ESR750]

Thanks for the replies. Going to be stripping the scooter this week to get it off to powder coat. At the moment I have not even looked at the controller settings but I know that I am getting 50mph on WOT and the acceleration is very fast!

I am sure there is head room in the controller settings to further speed it up, but wont try this until I reassemble the scooter. There is a few alterations I want to make to the tensioning system before I try this.

Got a quick video of my mate on the scooter, and also a little head to head with a 50cc. Which was pointless as there was no competition lol.