Longboard Project

[Kevin7]

Hi everyone,

First i would like to introduce myself short.
My name is Kevin i'm living in The Netherlands, student, 21 years old and would like to build a electric longboard.

After some research i think this must be possible for me to do.
First i would like to show you the part list i had in mind, with a few questions.


Motor: Turnigy Aerodrive SK3 - 6364-190kv Brushless Outrunner Motor
http://www.hobbyking.com/hobbyking/store/__18181__Turnigy_Aerodrive_SK3_6364_190kv_Brushless_Outrunner_Motor.html

ESC: Hobby King 150A High performance Brushless Car ESC
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=41171

ESC program card: Hobby King HKSS programming card for HK 150A ESC
http://www.hobbyking.com/hobbyking/store/__10458__Hobby_King_HKSS_programming_card_for_HK_150A_ESC_.html

R/C and receiver: hobby King GT-2 2.4Ghz
http://www.hobbyking.com/hobbyking/store/__10608__Hobby_King_GT_2_2_4Ghz_2Ch_Tx_Rx.html

Recharger: IMAX B6-AC Charger/Discharger 1-6 Cells
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=30917



Belt: A 6R25M064090
Small cog: A 6Z25M016DF0908
Large cog: A 6L25M040DF0908
from https://sdp-si.com/eStore/Catalogas

Anyone see i missing the battery, what do you recommend?
Motor a right choice?
and because i'm dutch and a student i would like to know on wich part i could save some money
And any other tips?

Kind regards everyone!

 

[torqueboards]

Looks good. That's your typical build. You can add in (2) 3S Batteries since you are using the HK150A. I would go for the 20 amp discharge. They are a lot cheaper.

Next is how you will mount it and machine all the parts to fit your build.

 

[Murfix]

Good luck with the build.

Why aren't you ordering the belt/cogs locally? What's the shipping cost?

I'm Belgian so that's why I'd like to know.

 

[Kevin7]

Motor mounting will be custom made.
Simmilair to what other people posted:



This is not the final design but the basic.
Also the reason why i buy the belt and cog online is because i didn't have the time to look around locally yet
Murfix have you build a eboard by your self too? and do you know some good shops arround belgian of the Netherlands with usefull parts etc.?

 

[Murfix]

Yes, here's my thread: http://endless-sphere.com/forums/viewtopic.php?f=35&t=52390

I ordered my chain and sprockets from Mädler, it's actually a German firm (www.maedler.de), but they have an office in The Netherlands: Koppe (mail@koppe.nl). You can't buy from Maedler directly if you're not German, so these guys sent me the stuff.

I've had some stuff made by a supplier from my work, but I don't think they work for individuals normally, so that's probably not interesting.
I also ordered some extra chain from Alphametal NV, they're not far from the Dutch border actually, they have sprockets too (and I guess belts and pulleys as well).
I bought my board at tweedehands.be, 2nd hand as the name of the site describes

My other stuff came from the internet (Hobbyking, Ebay, AlienDriveSystem).

 

[Kevin7]

So i orderd my parts.
everything except the belt and cog's.
i will place an update when everything is arrived :wink:

 

[Kevin7]

My last update was 28th of October last year.
I happily announced that I ordered all the stuff I needed to build a Eboard, my next update would be the one when I received my ordered products.

After a lot of emails to Hobbyking and a lot of call to PostNL I ended up with nothing because something went wrong. They send the package from (the international warehouse) China to the Netherlands, and back again without delivering it to me.
All I got was a a refund without 35$ sending costs..... 35$ for nothing, so I wasn't ferry happy as you will understand.

BUT... after a while I got that feeling back again "I want to make a Elongboard"
SO... This is the right time to look again to my ordered products.

Because I let it rest for a month or six I must do the research again of how to build a Elongboard.
I read a lot again but I find it difficult to find the following things.

Choosing the right Batteries and the right Recharger, maybe its a bit stupid but what are the requirements of finding the right Recharger for the right battery? where do I have to look for?
I received 2 ordered goods from the EU warehouse one of them is my battery: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=35810
This is the one I have at home right now so I would like to order a right Recharger. The original plan was to order this one: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15379
is this the right choice?


Now the next one: where can I find more info about how to choose the right ESC and Motor for this battery ? or is this the wrong way to choose a motor and ESC? do I need to start a the speed or distance I would like to drive ?
Also I would like to know: where do I need to look for if I buy a motor and a ESC?

Just take a look to my first post, I don't remember how I got this setup but I would like to take a look to other options. maybe to become a little bit cheaper or better.

I remember it was good to buy a low KV Motor but why I don't know.
And a ESC with high A, I got one listed with 150A, but the listed motor said "Max Current (A)" 70 A
So can I take a ESC with lower A, I don't think because the Burst Current of the motor, but why exactly I don't know. and how to calculate the Burst current I don't know.

This is the reason I ask it to you all, just to get things back on track again. hope you can help me and make some things clear again.

 

[torqueboards]

You can buy most of all electronic parts from HobbyKing.com. They're the cheapest as far as RC Hobby parts go.

You want a motor with low kv as it gives you more torque. If you plan on kick starting your board then you can go for a bit higher but then you also have to change the gearing setup to accommodate for a higher kv motor. With a higher KV motor, it will spin faster and it will allow you to reach higher speeds than with a low kv motor. In the end - it all depends on what you are trying to accomplish or what your end goal is for your board.

Let us know if you have other questions . It is hard for someone starting out.

 

[made_in_the_alps_legacy]

If you want to take some freedom with respect of supplies from hobbyking (considering the experience you had with them),
You might look at other suppliers like this one based in UK (I do buy from them stuff like motors and ESC) or this one which I use for transmission equipement, ESC, battery, remote transmitter/receiver kit.

Your questions you ask yourself are quite relevant, the main parameter which would guide us to help you is the power you want,
There are various tendencies around that, some ride slow on highly powered boards : they probably want their e-board to be extremly reliable, some ride fast on highly powered board : they probably have the guts to almost reach the rated power of their equipement, this being said, I don't think I am the only one to move on on downsizing our e-board powertrain (currently working on a 4S setup, 60A ESC, 50mm 320kV motor...)

feel free to have a look here or here and you should see how much is actually measured for different riding style...

 

[Kevin7]

thanks for your reply!
I start learning again and I made a calculation.

I got a 6S battery so I got 22.2 V
This means 22.2 * 65 (Max Current of the motor) and get 1443 W
The Maximum Watt of the motor is 2450 and I will never reach that, right?
http://hobbyking.com/hobbyking/store/__42031__Turnigy_Aerodrive_SK3_6364_190kv_Brushless_Outrunner_Motor_EU_Warehouse_.html

To safe money I can buy a motor with less Watt but above the 1443 Watt ?
Is this a right way of thinking?
Also How can you calculate the burst current?

 

[made_in_the_alps_legacy]

the motor has not much to say regarding current... either it can convert what he receives from the controller in mechanical power, or he dies…

This motor seems designed to developp up to 2.4kW when supplied with a 10s battery and will consume 65A under such load
(37V x 65A = 2.4 kW),

- if u do run it at lower voltage and lower current, u invest in a reliable set up with some extraweight…(u will ask this motor only a third of its capabilities)
- if u want to save weight and money, u can go with a motor rated for 1.5kW and reliability might still be there…( u will ask this motor about 2 third of its capabilities)

( It's only my opinion as long i haven't seen a power measurement higher than 1000W on an e-board...
i keep trying as a personnal challenge but even in the most demanding realistic conditions, it's hard to reach )
So… burst current=1000W / 22V = 45A (Confirmed by measurements)

In my opinion, what power u want remains the key question, maybe search the topic regarding aerodynamics to get an idea how much power is needed for a given top speed... i think it also talk about slopes...

 

[Kevin7]

After a lot of struggling I finally have finished my board. I have now the following set-up:

osprey flare pintail longboard
HobbyKing® GT-2 2.4Ghz 2Ch Tx & Rx
ZIPPY Flightmax 5000mAh 6S1P 20C
Turnigy Aerodrive SK3 - 6354-245kv
HobbyKing 90A Boat ESC 4A SBEC
gears: 16 and 40 tooth

after my first run I was really happy with the result, but after recharging the battery with the imax B6 (balance charged, 5.0A up to 22.2V, 3.7V each cell)
I started my second ride the next day and had no more power for more than 500/750 meters.....

After recharging the battery again I had the same issue, I was wondering if anyone knows what the problem could be? is it the ESC? Or the battery i received a time ago but because my other order (with the charger and motor) didn't arrived in time it lay down for a few month here without using or charging it.
I will post a picture of my board soon

 

[razad7@gmail.com]

Did you make sure your - BALANCE charged them? this is critical.
I addition did you look at the voltage of each cell at the end of the charge?
other things that can be - 1) you have a shortage 2) faulty battery