In addition, I’ve already purchased the two esc’s from @barajabali, belts from SPD(15mm), wheel pulleys from trampa (15mm), aluminum for the mounts (6 thousand series 1/2 inch), and some misc things like the remote.
Right now my biggest question has to do with MOTORS
because of my 15/66 drive ratio, 170kv puts me at a theoretical top of 37mph, at 80% efficiency that’s around 30mph.
I know I don’t want to go faster than that, but having the extra wheel speed available is a plus in my mind.
Ollin Boards 170kv 5065-pros-
light
enclosed
keyway
8mm shaft
perfect kv
-cons-
only 50mm
might be cutting it really close on dual for length if you look at my truck dimensions…
I could also go with a 6355 from Torqueboards, Enertion, @michaeld33 (with 10mm shaft, limiting pulleys alot), but all those are higher KV than I’d like to deal with… They would all easily fit my setup though without sacrificing power, except for the KV problems.
Turnigy 6374’s are outa the question though for length…
this will be a fun board! Why don’t you just pick the stuff we offer?
Our mounts will work for the 83mm, the 90mm and 7" Wheels. Lots of
brainwork in there to achieve this unique feature!
Left and right mounts are available!
The desired top speed is far to much! You can drop in Dampas to reach higher speeds, but: Its a Carver not a racer!
You would loose all the ability to take sharp turns. These Mini Spring
Trucks really behave completely different to longboard trucks! They are
so much more fun to ride. You really want TORQUE, not topspeed. You want
to take steep turns and then accelare to take the next turn.
Our 136 KV @ 1Nm motor is really nice to reach the desired speeds.
Designed to run on 12S, it has plenty of torque and is fully HALL
sensored + temp sensored. Its really designed to match the VESC setup
perfectly.
Guess who did the testing, consultancy and final tuning? Its a motor
without any compromise, designed to go hand in hand with the non
compromising VESC.
The 136KV@ 1Nm motor would give you 42Km/h top speed on 12S. That is far beyond any scale of ride comfort and safety!
You don’t want that extra “wheel speed”, because this would make your
setup very inefficient when you ride at lower speeds or want to ride up a hill.
You want to gear exactly for the average speed
you ride and the hills you have to take. This way you run the motor mostly at peak performance,
draining a min of Amps + have lots of Torque.
All you currently do is loose Torque and run the motor not at the
performance curve section. The difference is: 70% COP vs 90% COP. It
really depends on how well you choose your gearing and corresponding
Motor KV + Voltage!
Hope that helps a bit to get a perfect setup running.
I went ahead and ordered two 66t pulleys with the board, and will be making my own mounts.
Unfortunately, with my current budget I can’t shell out $265 per motor as you have them listed, I will be going with some of @JLabs 6355’s. I am also concerned with the truck width (I will be using aluminum mounts instead of the super thin carbon you guys are designing), so the sk3 6374 149kv is also out.
Also the speed controllers will be torqueboards 12s esc, which doesn’t have sensors, so I wasn’t taking that addition into account, even though it is a nice touch!
I think at my weight (60kg) topping out at 30mph isn’t going to be horrible, especially riding in a dual config. I won’t ever go that fast, but when riding in sand/dirt it’s fun to get a bit of wheel slip.
I may just drop the voltage down to 10s to drop the top speed even more. still undecided one the battery front, only concrete figure is that I will be going with lipos.
-Trampa Urban Carver: $400 after shipping
-2x Trampa 66t 15mm wheel pulley: $90
-4x 15mm 425mm belts HTD5M: $56
-2x 6354 190kv @JLabs motors: $132
-2x Torqueboards esc’s with programming card from @barajabali: $245
-6001 series 1/2inch thick aluminum (a lot of extra too): $30
-GT2B: ~ already have
-UBEC: ~ already have
-Lipo charger ~ already have
-Misc wire, connectors, etc: ~ already have
Spent thus far: $953
needed:
-15mm Motor pulleys (12t? 15t?)
-BATTERY SETUP
-enclosure style
I currently have about 180-200 that I can spend right now. This makes me lean towards a lipo setup just because I wire together two 6s batteries and get a running board without spending even more of a fortune.
That said, I do have a complete that I could sell… really don’t want to hassle with parting out, but would be willing to let it go for cheaper in order to fund this mountain board.
75a 83mm Abec flywheels/caliber trucks silver/torqueboards most recent mount/ single torqueboards 230kv 6355/ Castle creations mamba monster 2/ gt2b/ fiberglass case/6s4p lg cells (no BMS, just lipo charger/balance plug)
Pictures will start rolling in this week as the board will be showing up- already have some small things like the aluminum!
I would go for 13 teeth.
Regarding the space available between the pulleys, I can help you to figure that out. I think Sk36374 will not be possible. Let me have a look…
Two VESCS would be better if you ask me. Current control, temp sensoring, FOC, super smooth startup without sensors, canbus…
I’m waiting on delivery of the complete (except battery and electronics) Street Carver, which is a close cousin of this Urban Carver. I’ll be setting it up with at 12S with a VESC.
@cmatson I look forward to seeing your complete setup. Have you given much thought to enclosures? The flexy deck presents challenges. I’m thinking of either (1) putting everything in a box on sloped portion on the back or (2) putting the batteries in the front and the electronics on the back, but I’m not in lo ve with the idea of either solution.
@trampa Can you elaborate on the motor’s specs? For instance, what is its maximum current rating? Also, will the sensors all work with @chaka’s VESC? Of course, it’s a very expensive motor. I ordered it mainly because I figure you guys will have engineered everything to work very well as an integrated package. How would you compare it to the SK3 6374 149kv motor (I’ve been using until now)? I’ve been very impressed by its performance.
Hi Steve, what kind of battery so You Want to Mount? 18650 cells or Lipo Packs. I would recommend to usw our Battery Support, since it fits directly onto The Tip, allowing The max tilt of the trucks.
Motor: Our Motor is based on the SK3, despite being completely re-engineered to suite skateboards even better. Its based on 6364 format. Everything is top spec, magnet, copper, bearings, shaft etc! That’s what you pay for…
No chance to increase the quality any further.
Max current rating depends on the voltage you want to use. 50A is about the limit. Since the motor features a temp sensor, you will not be able to overstress it, using a VESC with the latest Firmware, which will be released in mid November. Benjamin and I tested it to the extreme… It works just fine pushing 200Kg up a steep incline on a single.
When the motor reaches 100deg Celsius, power will be reduced to let everything cool down.
Frank
Anyways, @SteveS I got the stiffest deck Trampa had available at the time, but you are right in that it still is flexier than any wood deck I’ve owned before.
I was thinking of doing something like this, because I have a lot more height than you do to work with:
It would have the two esc’s in a box on the back angled portion, and 4 (or maybe just 2) 6s lipos on the bottom. The bottom ones would all have their own little enclosures with lids, so that the batteries can be taken on and off the board.
If that all looks to fail, I may just stick them in the middle like the guys with bindings… even though that for me is the last resort.
To answer all your Questions:
50A x 44v =2200W.
Peak performance is roughly 2800W.
All motors you find on the market are usually rated “peak performance”, not continuous.
The temperature at which you ride the board does also play a major role. In Siberia you will get a better performance than riding in the Sahara. Tarmac gets very hot in summer, even in northern countries.
You will not use that amount of power continuously, so its well balanced. Using a dual Setup releases 50% of the strain.
Using temp control, which will be implemented into BLDC-Tool soon, will avoid any motor or controller overheating.
Pushing the 200Kg up a steep hill on a single is something you should never do! But: The temp control saved the VESC and motor from being fried. It works very well.
Please make sure you drop in realistic values into BLDC-Tool + use a fuse between the Battery and Controller. We use 40-50A fuses, but that depends on the capability of your battery. Never trust the C-Rating printed onto cheap Lipo Packs. I would deduct quite a lot to be within the safe region.
Battery position: Please keep in mind that the deck is capable of tilting 30deg! Your section drawing is nice, but does not consider the lean. The decks edges do get very close to the ground when carving hard.
A stiffer deck does not help in that case. Please choose the deck according to your weight, rather than speculated ground clearance.
We put the Battery onto the rear tip to avoid any chance of ground contact. You know what will happen if you damage the cells by impacts!
When you ride the board you will be amazed by its performance and ride comfort. You will not think about your battery mounted somewhere else than under the deck while riding, believe me.