Next Redux Deck
MBS Matrix Trucks
MBS F5 Bindings + FX Pro II Heel Straps
4x Mefo Ice Slider 11x4,50-5 on 125mm Gokart rims
4x VESC 4.7 modified with heatsinks, 0,5mOhm shunts, extra TVS diodes and lots of caps
4x c6364 with internal hall sensors
2-stage 8:1 - ISO-04 chain reduction
32W LED headlight
12s30Ah lipo (10Ah+10Ah+10Ah packs)
3D-Printed NRF Hand Controller (VESC NRF Hand Controller - ESK8 Electronics - Electric Skateboard Builders Forum | Learn How to Build your own E-board)
Just the right toy if you want to have fun when you want to go really offroad:
But let’s go back to 2015 when everything started:
Infected by the eSk8-Virus I wanted to build my own unique board.
When I started this project, the first designs of the VESC were released but not commercially available.
So I had to order the PCBs somewhere in Hong Kong and a bunch of electronic parts from mouser and to assemble my VESCs by myself:
I bought a cheap, used MBS Pro90 board of ebay and some MBS Matrix trucks. Unfortunately the board has only 20 degree tip angle so I had to use angled wedges to get good steering capabilities.
As my intend was to go really off road, the ‘normal’ mountainboard tires seemed too small and I decided to use 10" mini quad tires:
Because I tried to build this beast as light as possible I started with quite small Hobbyking NTM-5060 motors. Of the box they have way too high 270kv so i had to reconnect them to WYE resulting in 155kv. To get the desired 40kmh with those big tires I needed a reduction of 8:1 which was easier to archive with a 2-stage chain reduction held together by laser cut aluminium sheets.
Took it to the German eSK8 Championship https://www.esk8b-dtm.de/?language=en but even if the track looks like a desert and the board looks like escaped from Mad Max the smaller boards were better to handle on this course:
One of the first improvements was to get rid of those crappy voltage based battery meters. Instead I’m using this coulometer until now without any issues:
It can be programmed to any battery capacity and to different shunt resistors to match almost any setup. It sits together with a bicycle speedometer in a 3d printed case on top of the VESC enclosure:
@Duffman Wanted to comment ‘‘Destroyer of tires’’ … but then I saw the picture with the crappy tire, so yeh, they were probably not of the highest quality… too bad you had to remake the rims for the new tires to fit.
Yes, the power output of 4 NTM5060 was already impressive, but if you were drawing high power for a longer time, like riding in snow or loose sand, they got veeery hot.
Later I switched to c6364 motors and beefed up my VESCs. This almost doubled the power output…
VESC with heatspreader soldered to the common positive FET connections, 54V TVS diode on top of of the big ceramic cap. Hard to see under the heatspreader:
Jeesus, this beast is the stuff of dreams. I never thought I would want a mountain e-board. After riding one for 5 minutes and seeing your stuff my bank accaunt is going do die (after its alive in the first place )
I’d like to officially cast my vote for @duffman for Build Overkill Of The Year (BOOTY award) in 2017, based on posting date, at least. I know this build is actually much older, but who cares? BEEFCAKE!!
@Okami The total cost of this build was somewhere between 4-5k€. Hard to tell with this constant rebuilding and improving, don’t really want to know exactly…
I have a total of 28x 680µF caps. 7 per VESC, so 4760µF instead of 2040µF. But much more important is that each of them has less then the half esr than the stock caps, in common 5 times better. So hopefully less voltage spikes from switching at high currents.
But back to the buildlog, I still have a lot of things to show you in detail:
The first testride with the new big tires was a lot of fun, but they were throwing so much dirt at me that I had to build fenders. Therefore I had the mounting plates cut from 4mm Alu and the fenders from 2mm Alu and bent to shape:
