Im a spoiled evolve carbon AT rider, everything is fast, solid, smooth and soft, carving is crazy grippy, you can just ride over everything really (for example small children!). the downside: I burn a set of tires (about 40eur) within 2-3 weeks and on REALLY nice pavement, carving feels just a little more awesome with oldschool skateboard wheels.
So I kept reading and reading on ES and man, I REALLY like to fiddle with things ... although the considerable costs kept me at bay for a while, I eventually gave in and started to look at my very own DIY build.
wanted to share some impressions of the board im about to build up. I really like topmount boards, they have this compact beautiful look on them - but I also knew that if i ever wanted to drive with regular skateboard wheels, it had to be REALLY large soft wheels with shock pads and everything. Used to have the street kit on my evolve and the carbon with the 80mm kegels just really doesnt work on the pavement around my town - its rattling and the grip is bad.
anyway, topmount & large wheels ... those two things dont really go along too well. on top of that, the silly caliber trucks shorten the wheelbase by about 1inch compared to most other trucks, so that doesnt really help with wheelbite either!!
spend the last few days trying to wrap my head around how to make it work without looking absolutely ridiculous ... naturally I went for a downhill board. the stiff flex prevents stress on your components and at the same time its very stable at high speeds. had my eyes on the landyachtz top speed 36" for a while now because not only does it look beautiful and locks you in well for higher speeds, but it also has a soft w-concave that results in a near flat 13cm wide patch in the middle (13cm = 2x 6.5cm = 2x 18650 cells
the board arrived today, ordered black caliber II 44° trucks as well as some shock pads, including a 6°angled shock pad riser to turn the 44° into 50° calibers if I feel like it. the wheels were abec11 flywheels, 90mm diameter, softest compound 75A. Put everything together with 1/2" risers and omg, wheelbite heaven, no way to run this kind of setup without a deathwish. I felt a little gloomy cause I was betting on the 1/2" risers, but not even another added 1/4" riser helped ... and of course it looked ridiculous already, so high above the ground! started looking for other boards that have more clearance, but in the end 90mm is really quite something - most boards are aiming at 70-76mm wheels - cant just stock it up to 90mm and expect it to work I guess.
so I finally went into the workshop and added 2 more possible mounting options per truck - basically what I did is bring the trucks closer to nose and tail = increasing wheelbase. I ended up shifting each truck by about 3.4cm, to counteract the loss in maneuverability I used the angled shock pad to bring the 44° angle to 50° (which actually also increases wheelbase a little and also gives a little more clearance truck<->deck). what I ended up with is a fairly beautiful looking topmount board, thats not ridiculously high above the ground despite 90mm monster truck wheels.
2 more mounting options, each shifted by about 1.7cm. I tried to make it look like a stock solution - some of the boards come with more mounting options - think I succeeded.
6° angled shock pad which is nearly 1/2" at the thickest part - added another 1/8" shock pad and then mounted the caliber II 44° truck. hoping for the smoothest ride with that kind of rubber between my feet and the ground. 90mm 75A wheels and over one cm of rubber shock pads!
It ended up looking quite harmonious imo - as harmonious as you can look with 90mm wheels really.
With this kind of riding height to work with, I can really point the motors far upwards, bringing them close to the deck and giving me a lot of ground clearance to maybe even drive down a sidewalk like I do on my carbon AT. The only available truck mount that allows 360° customisation is the http://diyelectricskateboard.com
torqueboard motor mount, that has been used by okp on his latest beautiful build - really a very solid and good looking mount judging by the pictures. optional black anodizing really helps with the "regular longboard disguise", since any crazy anodized colors will draw unnecessary attention of the police in germany (where riding such vehicles is prohibited unless they drive < 7kph
so, going from there the rest of the setup kinda fixed itself, since I dont want to deal with more overseas shipment and customs formulars than necessary (think otherwise I probably wouldve tried VESCs as well):
* Landyachtz TopSpeed 36,5" with new mounting position (increased wheelbase by 6.8cm)
* Black Caliber II 44° (to match motor mount color) with Bolzen 6° angled rubber risers (calibers 44 + 6 = back to 50° & good shock dampening)
* Abec11 Flywheels 90mm 75A (softest compound)
* Abec Biltin Bearings (its just so convenient to have spacers and speed rings built into your bearing)
* Riptide WFB Pivots for the Calibers (love them)
* Riptide Krank 87A Barrels
* Dual black Torqueboard v1 Motor Mount w 15/36 gearing and 5MGT 275mm belt (9mm width)
* Enertion RSpecc KV190 dual engine with enertion 15T pulley
* Torque Dual 120A 12S ESCs
* 12S Ubec to fuel the dual ESCs
* Nyko Kama Nunchuck (ordered in the US since it doesnt seem to be available in the EU)
* Battery: 10S4P for 12Ah x 36V = 432Wh (can use evolve charger), made of LG 18650 HG2 cells (up to 20A & 3000mAh per cell).
Thought a while about which cells to use, since I was afraid of the crazy outrunner power consumptions (mostly peak). After asking around and looking at https://endless-sphere.com/forums/viewt ... ge#p957283
I decided that the way I ride Ill probably end up using an average power consumption of 300-500ish Watt (pretty much matching my evolve AT with 350Watt avg) with a peak consumption of probably 1000-2000 watts (onloop & others). in a 10S setup (36V), I would need to drain up to 60A in peak moments and around 15A average drain, so I needed cells that can take a beating of up to 15A per cell. I asked around again and Riba pointed at different cells, among them the LG 18650 HG2, which seemed to be a nice blend of high drain (up to 20A) and high capacity (3000mAh). In a 10S4P setup, this battery can provide up to 4x20A = 80A x 36V = 2900Watt peak power and it really shouldnt have any problem with a constant average current of 15A/4cells = 3.75A/cell average drain. --> building of the 10S4P battery pack
These speccs bring the board up to a theoretical maximum of 48kph (190KV, 15/36 gearing, 90mm wheels) and a range of 40km+ (36V x 12Ah = 432Wh = 1 hour ride @ 432Watt which is about 40-50kph = 40-50km range ... pretty much a worst case scenario). The power consumption and range probably depends quite a bit on the impact of the soft 75A 90mm flywheel compound - might be consuming quite a little bit more power compared to 80A kegels for example. I expect a similar (but less pronounced) battery life impact as seen for example in the street vs all terrain option on the evolve boards.
The motor RPM at max speed is 6840rpm in the 10S setup, so quite a little bit short on vedders magic number http://vedder.se/2014/10/chosing-the-ri ... kateboard/
most likely the KV of the motor shouldve been chosen a little higher OR I should run with a 12S battery layout, bringing the motor to 8208rpm with a max speed of 58kph. For now Ill go with 10S to use the evolve charger, but maybe I change my mind some day and rewire the cells. 12S3P vs 10S4P = 4 cells difference only.
Will update this thread every now and then when all the parts arrive, which is probably in 2-3 weeks.