Segmented Carbon Flex Enclosure for Trampa Urban Carver

ESK8 Builds
101

This is my method of closing off the ends:

I usee a 20x25mm plastic L-Profile and some 2mm thick EPDM foam (single side sticky sheet material). I stick a strip of the EPDM on the inside of the battery enclosure, followed by two more strips, leaving a gap, so that the L-Profile slots into that gap.

The cable outlet holes are made wider (8mm) and then I stick some rubber (bicycle inner tube) on the inside of the L-Profile. A tiny hole can be cut into the rubber, using the revolving punch pliers. Now you can pull the cable through the rubber and the cable outlet will be sealed off.

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How to put a nice thread into a Trampa Deck. Actually you can cut threads into our decks, so you can also cut repair threads! Wind them in with some epoxy resin. Grip tape can be attached once all threads are made. Think twice before you attach the grip tape. Finish your board first! The last thing is the grip tape!

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Cross section with 2x 18560 Sony VTC Cells

Hope that helps a bit to envision the procedure…

Frank

7 Likes
102

looks pretty good frank! you should make an official trampa thread where you build an emtb with trampa only parts! :slight_smile:

miniupdate for me - sugru arrived and esk8.de remote & vescs! fixated the bullet connectors on the inside now:

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7 Likes
103

I will build up a carver with battery box below and will show the results in another thread. I still have the Street Carver No.1 from 2013 and that will get a solid update now. I like your BBox a lot. As you said, its very special for the Carvers and we aim to offer something more generic. So our Box will fit most builds incl. Longboards. The slitting I do is just to give all viewers an idea how to build a box for a flexible, arched board, using basic tools everyone has or are available at your next doors hardware store. Where are you located BTW? Take a photo of the massive smile on your face after the first ride (-,

Frank

1 Like
104

Looks great!

How strong is Sugru whitepony ?, it sticks well to your Carbon Fibre?

105

Once cured, it’s very strong. I have been using it for at least 6 months now, to hold a power strip (I don’t know how you call those, if you Google it images that show up are what I mean) on the bottom of my desk. The strip weights at least 1,5 kilos since I have 9 things connected to it, just hanging. Still holds strong

1 Like
106

phew, got home from 12hours work and now I fiddled for 6 hours straight to finalize the board. :sweat_smile:

it was a LOT of soldering, one complete rearrange inside the electronic segment, waterproofing the enclosure with neoprene band, setting up the 2 vescs, then putting it all together and doing a quick maidens ride in the rain.

turns out my phase wire exits and triple on/off/charge ports were taking a lot of room in the wrong spots - and all of that just so that the phase wires would not cover up 2 enclosure screws on the outside :confused: in the end i had a LOT less room to work with than initially planned.

I got the 2 vescs cornered now under the protective felt sheets, 2x 2200uF external capacitor bank instead of 6x 680uF stock capacitors (which just took too much room) and both vescs are connected to these capacitors in parallel. hope this wont end badly, since the 2 vescs are directly coupled now to ONE smoothing reservoir. 10awg wires and all 5.5mm bullet connectors didnt help with the available space either - shouldve just directly soldered everything together instead of single 5.5mm bullet connector units. the receiver is set up in the opposite corner next to the capacitors - went for ppm splitter instead of can cable, because I was a little afraid of killing vescs by accident - the receiver seems far enough away from strong currents, didnt have any issues with reception on my quick run.

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the whole enclosure is sealed with 2mm thick and 2cm wide neoprene band, that compresses so much under all these screws that you cant really tell from the outside (I can take some pictures tomorrow). I found that the capillary effect with 2 very well fitting surfaces really sucks in the water, so you really need something to break this effect.

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for the maidens ride in the rain hmm, where to begin? I ran for a total of 5min, then the rain got even stronger and I fled back home. my first impressions were:

  • camber of these trampa boards still a little strong, need to stand in the middle of the board to really level it out. I felt like it might grow on me though with pushing outwards in turns, because its fairly flexy afterall. couldnt push too much with fresh electronics and wet roads!
  • very turny, maybe removing the yellow dampas wasnt a good idea afterall with the dual motor speed!
  • running the motors as dual foc and the board is REALLY suprisingly silent - also expected the direct drive gears to be louder than the belts. couldnt really tell much of a difference to be honest.
  • amazing coasting!! didnt think the drive gears would coast THAT well :scream:
  • pretty high top speed - was setting the board up, so that i would hit 48kph with the 125mm trampa urethane hub wheels. well, now I still got the 7" pneumatics and with the 1:4 gearing, 230kw motor and 10S battery, this is 60kph+ :stuck_out_tongue:
  • nearly forgot how strong dual motors are. set up 40A battery -10A braking per vesc and fully throttle/braking is really strong.
  • pneumatics suck, Im really an urethane guy :joy: didnt counterbalance the stupid valve, so I had annoying vibrations from the wheels. the immense grip makes riding a little boring, because youll never ever slip kinda and it feels so disconnected from the road. flexy board and soft trucks is one thing, but its still very direct. pneumatic wheels are always somewhat spongy and all the precise nice urethane ride is gone. @trampa gimme those urethane hubs!!!

fingers crossed for better weather tomorrow

14 Likes
107

ok, it actually started to grow on me, like I already expected yesterday. we got a lot of wind, but not much rain so i was able to run one full battery now. the direct drive is AWESOME, really best thing that happened to mountain boards in a long time. shouts out to @esk8 @Nowind who brought this to the market!!

pneumatics still suck though, I just hate it. need to balance the tyres - the stupid valve wobble is driving me mad. and since Im carving like a madman, the tyres already have pretty heavy wear after just a single battery. :expressionless:

suprised about the 14ply board - its the lightest of the trampa urban boards and with my 82kg Im not really a feather, but the board still feels juuuust on the edge of being too stiff. no clue how others ride with 16ply+ :astonished:

trucks still need tuning - i ran without dampas and it was too soft, I put in yellow dampas and it was impossible to ride any turn (this is really something for bindings only). @nowind pointed at pre-tensioning which I kinda overlooked until now - gotta play with that later when the battery is full again.

with 2 motors I find myself to ride much more aggressive - quite amazing brakes with 2 pneumatic wheels and 2 motors :stuck_out_tongue: the battery is actually getting slightly warm which has never ever happened to me before really. :hushed:

5 Likes
108

@whitepony hey man what 18650s are you using for your most recent batteries? I’m getting ready to take the dive into making my own but i’m still unsure of what batteries to use. My setup will be nearly identical to the build you have now.

Also do you feel like the 230kv’s have enough lowend torque ? Sorry if it’s a noob question, i’m still learning about Kv application and best use.

109

been using lg hg2 for nearly all my builds! its a great cell with very little sag, decent tradeoff between current and capacity.

about the motors: i tune kv to hit the speed i want to hit. with my 125mm urethane target wheels and 10s battery, thats 230kv! torque is never an issue with 2x 63mm motors tbh :stuck_out_tongue:

1 Like
110

This battery pack was built differently than your other ,…Do you think you are getting more conductor heat from these Series connections ?

111

Put the springs in outer position and tighten down the adjusters until they sit flush with the deck. Also try dampas in the back (inner position) and no dampas in front truck, outer position. Flex is s matter of taste. We have 110KG riders ordering boards. Some like a plank, some like a trampolin.

How much inflation do you put on the tire? Try 65PSI. The beauty about the pneumatics is: No Vibrations, smooth gliding, hard pack (trail) riding. Horses for courses…

Frank

2 Likes
112

@whitepony I’m dying to see your build on MBS wheels.

I still can’t swallow the look of a Street Carver Trampa board on pneumatics, I feel like something is not right, aesthetics is somehow important for me, however I think the pneumatics have an AMAZING look on an e-MTB with a long deck and huge hangers.

1 Like
113

I think overall 4x nickel strips are better than 1x nickel strips and some copper - alone for the soldering heat. pack is a lot more solid too!

think the heat is just from the load. pneumatic tyres, a lot of speed and quite aggressive acceleration/braking - currently I still enjoy the dual motors - didnt have that in a long time now :smiley:

ended up at slightly earlier than flush position - feels really good now! :slight_smile:

what I really hate is the stupid valve wobble - on my first eboard (evolve carbon), i added weight stickers that you use to counterbalance car tyres. think ill have to do the same for the trampa hubs until Im finally getting my hands on urethane hubs! :stuck_out_tongue_closed_eyes:

wont happen, i was motivated to build up this board by direct drive + urethane trampa hubs - thats what I will run in the end. direct drive is AWESOME, I love this so much. nice coasting with 100% grip, no belt slipping, silent drive anyway, splash and chip proof - its simply perfect!

valve wobble and excessive wear aside, pneumatics can be quite alright and I kind of got used to them again. reminds me of my evolve carbon AT - just ride over anything, sidewalks, sticks, chips, road, nothing matters, and full carve all the way.

problem is, with the crazy grip of pneumatics I carve even harder and pneumatics just wear down so quickly then. on my evolve I always had to swap a full set after 200km - it got quite costly and was also annoying.

overall this monster keeps on growing on me - love the torque, love the speed, enjoying cross country capability, switching sidewalks and street a lot. with the adjusted spring tension, the board feels a LOT better - its a night and day difference. now I can actually play with the flex to adjust a carving radius which wasnt possible before, cause the trucks would just cut in super hard. with the new feeling of the trucks I have to say that the flex is actually quite spot on now (now that I could actually use it for the first time) :heart_eyes:

first 100km down now, very lucky with the weather. Ill just order a few sets of tyres until urethane will be available! :stuck_out_tongue:

1 Like
114

You need the pre-tension on the springs. When you compress one side, the opposing spring will sit to loose, when the adjuster is not locked down. It makes all the difference!

Frank

115

I bought a set of these wheel weights to fight the pneumy wobbles. They’re light enough to fine tune the balance weight, and you’ll never run out, hopefully. You could even share with your friends.

Motion Pro 08-0553 Black Steel 1/8 oz. Wheel Weight - 144 Piece https://www.amazon.com/dp/B00CU8ZS48/ref=cm_sw_r_other_apa_vN7-ybNV96NCZ

116

yea, I got those laying around. think I was the first documented evolve rider, who balanced his wheels with weight stickers :smile:

does anybody know if the evolve GT pneumatics fit trampa hubs?

http://evolveskateboards.de/index.php/component/virtuemart/all-terrain-reifen-und-mehr/evolve-gt-reifen-schwarz-detail?Itemid=0

1 Like
117

I think Evolve uses MBS hubs - so they should be very similar to the trampa ones.

118

evolves GT hubs arent the MBS rockstar hubs anymore and the GTs are using 7" pneumatic wheels that are supposed to last longer than the old 8" MBS roadie (which just melted away like snow in the sun).

119

I just remembered this post

Where the MBS tires were fitted to the evolve hubs - so thought that it should also work the other way around

Maybe @caustin can tell us more…

1 Like
120

Unfortunately, I don’t ride trampa AT hubs, just Evolve GT (with various 7" evolve tires and various 8" mbs tires) and @psychotiller (with Matco’s). @whitepony is correct as usual lol, evolve no longer uses MBS hubs for GT (only Gen 2 work with MBS hubs). Yes, I was surprised the evolve hubs also work with 8" mbs tires and 8" inner tubes. I have had good experience with the evolve GT pneumatics, and wear down has been OK typical to other pneummie tires. Not sure if you are contemplating the evolve roadie slicks or knobbies, but @trampa should be able to say if they fit on his hubs.

What @trampa really needs to tell us though…is where are the uro 125mm hubs he promised us!!!

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3 Likes