UPDATE: There is a a V4 now.
So, I had this: Folding commuter? - #34 by sevenfloorsdown. It used a LingYi ESC, a 6S battery and weighs 8kg. Having used it quite a while, I figured it was time to upgrade it, give it a new coat of paint (and grip) and make it lighter.
The aim is to have a relatively light weight board I can use when I need to be extra discreet (e.g. going into office buildings where I don’t work, crowded restaurants or pubs, or going on dates where I can’t drive). Another goal is to have a board I can take on flights. FYI, it’s 7.5 kg; previous version was 8.5 kg.
Below are some specs and the reasons for going for them. Also, take note, I am in Australia so I have limited access to some parts without paying an exorbitant price. I wanted to keep this build at a reasonable cost as it’s not meant to be ridden every day:
- Boardup 33" deck - it folds so that you can fit the board into a backpack or be non-intrusive when it’s in packed venues indoors
- 3mm ABS split enclosures - I have used ABS before and it’s good enough for me for value for money (vs kydex) which I formed by heating (with a heat gun) and pressing. I don’t have access to a 3D printer and I don’t think it’s worth it for me to build a vacuform rig
- 144 WH 40T battery (10S1P) - I wanted this to be relatively lighweight and still be flight guidelines compliant–160WH is the maximum allowed but with airline approval. I originally planned using lipos but I made some careless mistakes and deemed that lipos would be too easy to make mistakes with after a long flight and too dangerous to be worth it. So, I salvaged some cells (and the BMS) from a pack I already own that had p groups dying due to previous water damage. It was a pack built by @danieloath which he graciously rebuilt in spite of the moisture thing. I may get/design/build bigger battery later on but this will do for now.
- Maytech 90mm, 100 kv hubs - I literally have no room for direct drives, much less belt drives. This is the best bang for buck hubs I could find AND buy. 90mm is also the biggest wheels I can go and still have this thing fold flush, though without some creativity required (see section about the front truck).
- Flipsky 4.20 ESC - this is from my BKB tayto which now uses a Xenith
- Flipsky VX1 remote - pretty self explanatory.
Some other things probably of interest:
- Non-abrasive grip tape - I’ve gone on some rides already and this tape seems to hold up well. I’ve used DKL grip tape before but that keeps peeling off at the edges.
- Reused SL-100 for the tail - I’ve also used the same translucent plastic puck trick I’ve used before.
- Helmet mount for an SL-200 at the front - it’s the only way I can have a headlight that is still removable plus the SL200 is shared with my daily driver. (Never mind the chipping on the switch as it’s only superficial as it’s a used deck).
- The front truck is a caliber clone from another board with 90mm ABEC11 superfly’s. The baseplate, I had to drill extra holes so I can fit it a certain way for clearance issues. I also have a DIY wooden wedge riser just so I could bring the hanger several millimeters forward so that the board would fold flush.
Planning the build took some extra steps as I wanted it to fold flush still while still fitting the electricals.
The enclosures, I got the inspiration from YouTubers making kydex holsters and also when I realized kydex is also a thermoplastic that behaves similarly to ABS which I’ve used in previous versions of this build.
I did the heat forming on the deck so that I’d also get the curvature of the deck. After that, I did the paint job. Nothing special there: paint then clear coat then grip tape. Note that I used some paddleboard foam for the tail so that I could tell if I’m standing on it because the tail is basically flat. I also lined the edges of the deck with some reflective tape for some passive lighting safety.
As it’s basically ‘hand molded,’ there was a lot of adjustments made too to make sure things fit when folded.
Here’s a preliminary fit. Note that I still had lipos here which I eventually replaced with li-ion because I wasn’t confident the lipos would be safe in the long run.
Here’s the pack I eventually built. I don’t have a spot welder so there was a lot of nervous trimming of the existing nickel tabs, soldering, and wiring. It’s encased in some EVA foam for fit and shock absorption as well. It also sticks to the deck with some heavy duty velcro so that it eases some of the load off the enclosure. I couldn’t be bothered buying some plastic shrink wrap so on top of the fish paper, kapton tape and foam, I just used some fabric-less duct tape (I forgot which brand as I bought it years ago and has held up well in the various things I’ve used it on, better than the scotch brand duct tape most people know).
Here is the finished board from underneath.
- I used M5 skate bolts drilled through the deck. I covered the old holes with dowels and wood filler.
- I used an XT60 extension cable between the two enclosures encased in a fabric weave.
- EVA foam was used as liners and gaskets.
As for the VESC settings, nothing special: your usual reasonable configurations most people use (e.g. 17A battery current for each motor).
It’s not a very exciting build but I think it fits the niche use case perfectly. Takes me from point A to B and put it in a backpack when I can’t ride it.
