no point in burying the lead, it’s a Superspine with Duality trucks.
This project was a joke that manifested itself as reality.
It's no secret that I really like @Titoxd1000's duality trucks. Playing to the bit, I made some MS paint jokes about putting Duality trucks onto a v5
One thing led to another, and I realized that it wouldn’t actually be that hard to build.
A build of spare parts
A spare ubox vesc (that has a blown CAN bus that I’ve been meaning to repair for months. See above picture)
@Trivv3 lent me his Golden Superspine (which was originally won by Gialong at AVS)
@HAIRYMANJACK lent a set of batteries, 7490 motors, and 78T gears that he used to race with.
The only new part on this build is a set of dualities
The custom bracket
The key to this build was a metal bracket to convert the 3-link hym thread to a more standard angled-deck hole patern.
After 3D printing a prototype
I got em made in metal. Shockingly cheap, only $30 (including bending)
Somehow, despite 3D printing a prototype, I severely messed up the hole spacing. oof.
Ended up mounting it with 3x smaller M4 bolts. Good enough.
Huh… that’s an issue.
Solution:
The hym bolt was attached to the bracket with borderline illegal amounts of green locktite, and was put into the spine with a bunch of red.
Then, a cheater bar and all the ugga duggas
Batteries just casually velcro on top, and the wires hang free
Ubox quickly attaches to the tail with some wood screws. Wiring is dead simple.
Hubs are some spare MBS rockstar II hubs. The 78T gears are mounted with some standoffs that replace the hub’s nuts. However, the standoffs are to thin (slot in gear too large) and threaded part is too short.
Solution? add a washer and an extra standoff to stick through the gear.
Centering was pain, but I got it ““good enough””.
A nice addition to the fleet, off the esk8con we go
Couple people demo’d the board at the con, the concept showed promise! Here’s Josh W after only a few minutes on it.
The feeling was very unique. The spine chassis has zero flex, but the mounts do. It kinda felt like riding a flexy deck, but only the ends of the board did the flexing. Like suspension on a stiff frame.
Over the course of the day, the brackets slowly got bent out of shape. A couple of times we changed the truck angles by pulling them really hard, which was a fun gimick 
Eventually, they came loose at the hym bolt(shocking) and the board had to retire for the weekend.
V2
Not one to be deterred, I came up with a V2 mount. Stronger steel, larger cross-section, and fixed the hole geometry mistake.
Instead of green locktite holding the bolt, I threaded the hyme bolt hole with a tap, and used red locktite.
It’s hard to explain, but the V1 mounts had some… instability? They would twist left/right (in addition to bending up/down) when turning, leading to the board having a slight floaty, unsure feeling. Kinda like RKP but different.
The stiffer mounts removed a lot of the instability present in the V1 mounts. V2 was like being on rails.
@TheSharpergardner tried it out this weekend and immediately started pushing it. Maked this board look goooood. (you can hear the un-centered gears lol)
After a full track day of riding, predictably, the mounts rotated around the hym bolt, requiring a retirement.
So… That’s the condition that Super Duality is in now. Short of a permanent modification to the SS chassis(it’s not mine), I don’t see an easy solution to preventing the same failure mode from happening. Solutions probably exist, but they’ll require more effort then I’m willing to give this meme project. Entirely possible to keep fixing the hym bolt after every track day, but idk. Juice not worth the squeeze I guess.
That said, Incredibly glad I did the project! Some fascinating results with how it feels to ride, and I learned some stuff. I’m writing this post with the vibes of a post-mortem, so it’s incredibly satisfying to be able to call a project like this done^tm.
There’s something here with this idea, but not something I’ve got the drive to chase down. Perhaps I’ll come back to it in the future. For now, I’ve got many other projects asking for attention
