JUMPINATOR II | swappable batteries | lightweight MTB | HAERO | MBS | APEX

Do it! It’s awesome… I cut strips out of thin foam. In contrast to harder materials, I chose the foam because if you have to to press out the bearing with a screwdriver, for example, you can still move the spacer to do so. In addition, the spacer stays exactly in the middle due to the even compression.

That’s exactly what I thought when I came up with the idea

3 Likes

I’m sure you’re doing exactly what you need for your case. Personally, I’m on year 3 with my main board with no spacers and have noticed zero difference :thinking:

1 Like

It’s amazing how time flies, finally I found time to continue working on the build.

First step was the battery wire routed along the heel strap.

Then I soldered all cables for connecting the BMS to the lipos.

I couldn’t decide how to attach the batteries or lay the cables, so I just botched it that way
,

Then I found out that the BMS is defective. The battery had 44V but on the C-/P.- port were 11.5V only, damn!

Then I soldered wires for another BMS which I used in the past and started to charge.

When I checked the cell voltages after charging I was stunned. What is going on?

I had a broken brand new 6s wire extension, after replacing it everything was fine again.

I had then fiddled with the batteries a bit and suddenly there was a loud bang and bright flash!

Black magic happened :crazy_face:

I short-circuited the battery, well done! Unfortunately the bullet connector touched the XT90 female connector.

I’m a complete idiot, this was the third time I’ve managed to short-circuit a battery.

2 Likes

I’m so glad in retrospect that this short circuit happened, because I’ve now come a lot further. I did such a terrible job that actually had to happen!

I just soldered these weird cables because I didn’t know how to mount the batteries, how to lay the cables, and so on. This is ridicolous! Today I made a lot of decisions and implemented most of them right away.

I’ve wanted to have replaceable batteries for many years, but never came up with the right solution that would work for me. Today was the time to make this dream come true, let’s go!!!

I really need inserts, so I decided to go with this stable variant in M6.

The distance between the two holes is 18 cm, the deck is 21cm wide in the middle

I tried my best to keep everything straight

The fiberglass smelled quite a bit and I forgot to put on gloves. Even many hours later, I’m still itching all over :joy:

I am extremely excited about this new solution. There are unlimited possibilities to mount and swap batteries there. I bought these eyelets today.

With a velcro strap or similar I could mount any case/battery no mattert which size! This is really a dream :smiling_face_with_three_hearts:

But for my first plan I bought 6 millimeter thick plywood sheets in size 21 x 12 centimeters

I’m going to use these stable cases for the lipos.

On the one hand, I glued it with the ultra-strong nanotec tape and additionally fastened it with 4 screws.

Between the plywood panel and the deck I used self-adhesive rubber tape which is extremely sticky

In addition to the harder rubber, I used softer neoprene tape.

I also added neoprene to the bottom of the washers.

I’m so stoked! It’s really very quick to assemble or disassemble it, maybe 5-10 seconds.

I’m curious if the plywood will break. if so, then I will buy sturdier and denser MDF wood

I can’t wait for my first ride but the last thing missing now is the battery and new wiring.

It took me 1 hour to get 5,5mm bullet conectors and they were crazy expensive but I couldn’t find them online. Why bullets? Well, I like short circuits :metal: Stay tuned!.

4 Likes

I changed the connectors of the batteries.

Much better now with the XT90s and 5.5mm bullets for serial connection.

Extension with 150A fuse

4 Likes

It took forever, but now the time had come for the very first ride! I was so looking forward to it…

The first impression was horrible I thought oh my god what the hell is this! It’s as loud as an airplane, within a radius of 10 kilometers, all the people turn around, you can’t ride among people with it. I felt really ridiculous. Also, it didn’t take long until I had the first scratch, but that was to be expected.

Now I know what you meant, that the V1 motors are way too loud and whistle like a trumpet or flute, like crazy! I immediately thought to myself that I would need new motors right away, damn.

Then I wanted to know how it behaved with the pneumatic tires, time for swap.

With the tires fitted, it felt much better. Since the motors only whistle so miserably at higher speeds, this is more bearable with the 8" wheels. I will probably never use the Trampa gummies again.

After not a long time I had power loss because the ESC’s got hot. But that didn’t matter, because the battery from the remote control was completely empty. I thought I had fully charged it, very strange.

Next time I will ride the board in its natural environment, the dirt park, I’m curious to see what it’s like to jump with it!

5 Likes

I couldn’t resist and went to the dirt park before work today

I warmed up a bit and the jumping went surprisingly well with the white shock blocks. But they are still too soft to jump so I switched to the red ones.

In the outer position they are useless, you can not steer at all. If you try to steer, you just fall over. But certainly perfect for setting new speed world records!

In the inner position it works better, but I still think I have to order the orange ones, at least for the front truck.

The sound of the motors didn’t bother me so much in the dirt park, but the tires did. The tires don’t feel good, they’re hard as a rock even at 10-15 psi, very uncomfortable. I didn’t expect that because the 9" feel very smooth at 20 psi (and uncomfortable at 30 psi). The landings were very rough as if on concrete. Maybe I’ll buy T1 tires and switch to these or ride the mudpluggers at 0 psi :stuck_out_tongue_closed_eyes:

I can’t wait for more sessions in dirt park…

3 Likes

I was about to ask how you liked the Gummies till I read that you’ll probably never run them again😆

1 Like

I bought the gummies in 2017 or 2018 and used them for a few months at the time. Since then, it has actually only been dust collectors. The urethane ring is relatively thin and therefore not really comfortable although they are already great on very smooth asphalt. In general, I prefer to use pneumatic tires.

But since I have enough parts and spare parts at home to build a new board, I will probably build one only for pump tracks and/or smooth concrete with the gummies and belt drive.

1 Like

I too used mine for like 1 month and replaced them with 165 pneumatics. I agree, they feel great on smooth asphalt, the freeroll is great too. They look good but rough ride for anything other than smooth surface

1 Like

I finally finished the second battery and re-soldered the connections.

The current situation of how I have to charge the battery is quite cumbersome and not a permanent solution. Definitely each battery will get its own BMS.

I bought 3 smart BMS and have now tested all of them. Unfortunately, all of them only have 13.7V at the C-/P-port while the battery has 50V, which is really annoying.

You also can’t change anything in the app. The BMS is from 7s up to 13s and according the manual you short connect the empty rows to the positive total terminal of the battery which I did. In my case I connected 12+ to 13+ as well.

Today on the way to work, a nightmare happened to me. I was on the road with my commuter and suddenly, the Vx1 pro remote decided to go full throttle for no reason! It’s been a pretty hard impact, my foot, my wrist, my ass hurt, and I’m limping WTF!

RIP my brand new Hillbilly gloves, but they saved me from nasty injuries!

Thank God there were no cars or people in front of me, otherwise I would be fucked. Since riding with all boards is illegal, there is no insurance for it at all. After the crash I was able to use the brake to stop the board that had gone wild.

I’m scared as hell and would like to understand what happened. I’ve had a lot of problems with different remote controls, but it’s always been “just” dropouts, but 100% throttle for no reason is a complete different story. So far, this has only happened to me with the Trampa Wand and GT2E.

I wonder if interfering signals or strong WLAN networks can also lead to full throttle sensations in addition to dropouts. 2 of my 3 boards use the VX1 pro remote so I’m scared AF. The VX1 pro was the most reliable remote control I’ve ever had so far.

2 Likes

These are all my vx1s. All dead. Not the pro but the previous version.

2 arrived DOA. There’s something up with the antenna. If I touch the antenna to a piece of metal the remote works. I haven’t had the courage to fix those and try riding.

1 arrived working but disconnected once every 50 km or so. After about 400-500 km total it just went full throttle once, nearly shooting my board out onto a very busy 4 lane street in prague in rush hour.

1 was working for probably about 2000km, maybe a bit more. It didn’t seems to have any issues until one day it set full throttle randomly. At the time I thought I set the full throttle randomly but I always felt weird about it and I definitely didn’t remember sending full throttle. Then I continued to use the remote for a few more months without issues albeit not a lot of kms driven. In February on my last ride with it, it set full throttle on 3 different occasions with me standing on the board in bindings and heelstraps. Twice I managed to ride it out (it lasted 2-3 sec), the third time I got a speed wobble and fell. I smacked my helmet pretty hard into the ground and I got a light concussion. I also bent 1 rim pretty badly and 1 rim a little bit by smacking them into the ground.

Since then I am refusing to touch any flipsky remotes. I’ll continue to use my current non remote flipsky stuff but I am also not buying any new things from flipsky.

I’ll stick with my abused GT2E. It takes a beating like nothing else and it’s dead reliable.

I am pretty sure the full throttle failure is the potentiometer failing.

1 Like

Thank you very much for your feedback and the detailed information! After you had already convinced me to change the remote on my mountainboard, you have now also managed to get me to change the others :metal:

I realized that I also have VX1’s and not the Pro version.

Here the differences

Personally, I don’t think the potentiometer is to blame for this, but I don’t know much about the matter. Maybe the VX1 pro is more reliable but I don’t know if I want to risk it.

For this board I will switch to an old Maytech remote control for now. I stopped using it because I regularly had signal dropouts, especially in the city. But I’d rather have signal dropouts than 100% full throttle action.

But I’m looking for 2 new remotes I just don’t know which ones yet.

After many years, however, I also have to thank @Venom121212 ! He had posted a GIF a long time ago where his board went full throttle into a shelf, thank goodness but without him. I think the remote was called mini or macro remote. After I saw that I threw the brand new remote away without ever using it.

3 Likes

Yes you are correct, that was enertions Nano X remote and that was literally the first time trying it out before my very first ride :flushed:

Hmm, not saying that the remote isn’t faulty because it might be, but did you know that on that remote you must do potentiometer calibration everytime you turn it on?

2 Likes

honestly, go gt2b and 3d print tito’s case for it

or just keep the original case and mod it a bit, you can remove some bulk. For my next board I will try Tito’s case, currently i have the gt2e and that only fits the gt2b.

I really like the stock gt2e case also, and you can save some space for sure. I disassemble it, take the steering wheel and pot out, put some black hot glue into that hole, cut off the bottom, put a 21700 into the handle with a tp4056 charging module and just seal the bottom with black hot glue. You would probably be able to skip the charger module with the gt2b, as there’s some kind of charge port on the remote i think, and the batteries that come with it stock are the correct voltage for the 21700 also.



note, if you use the same tp4056 it can get super hot while charging so only charge it from a computer’s usb port (it’s limited to 500ma) and even then you should probably charge for 5 min, take it off for 5 min, etc. Maybe just my module is faulty idk.

But once you get that 5Ah 21700 charged up once, you won’t need to worry about charging for a loooong while.

Also I really preferred trigger over thumbwheel, especially as we get to the more powerful boards.

1 Like

Yes thankfully that was pointed out to me before hand. This one got fully stuck physically due to bad alignment right out of the box.

The Tito case looks very good but it seems to be too big for my wrist guard gloves. I also can’t hold the original GT2. I have already destroyed several of these gloves and I wouldn’t ride a single meter without them. They are even more important to me than the helmet.

I’ve also gotten very used to the thumb control. Although at the beginning, when I switched from the GT2E, I wasn’t that thrilled. But I’ll think again about whether there isn’t a solution for this.

Within the last month I have thrown away 4 useless remotes. 2x Maytech V1 (Steez), 1x VX2 and the Trampa Wand. May they rest in peace.

Thank God I recovered quickly from the crash and hardly had any pain at all.

It was a perfect day and time for the first trip of the year.

A year and a half ago I bought a 20-year-old camper van, which was the best decision of my life.

This was the first time I had boards in there instead of bikes.

At the beginning I immediately made an unscheduled landing in the field :joy:

Then I rode on company premises, which is of course forbidden. A kind of mineral extraction and building waste recycling company, whatever´who cares…

It was very rough and uncomfortable terrain. The velcro strip didn’t hold well and I almost lost the battery several times.

It was really fun to alternate between riding the two boards.

Next time I definitely have to make a video.

That was a really great adventure and I’m looking forward to the next ones

6 Likes