Bit of background information for you all. I have primarily been involved with mechanical engineering throughout my career and have little electrical knowledge. After many months of looking at Boosted Boards I decided I will challenge myself to make a DIY ESK8. I have been looking at a variety of components but have become lost in all the numbers and letters. Below I have summarised the components I think suit what I want and have also listed some questions I have regarding my build. Please note I am from the UK and parts seem to be hard to get hold of (unless I am looking the wrong place). I would like this board to have more torque than speed. 25mph is more than enough for myself but its getting up hills that I need. All advice regarding these issues or potential improvements will be appreciated
My current chosen battery setup is 2 x Turnigy 5000mAh 5S 30C connected in series. See link below:
Other useful information is that I would like to use the Orangutang 80mm Kegel wheels within my setup.
Now, time for the questions!
Firstly, I need a VESC. I have no idea what VESC to look for with my chosen battery and motor setup. Any recommendations? Hobby King sell a Turnigy SK8-ESC 4.12. Is this any good? See link below:
Secondly, I want an inline fuse to protect my VESC as I know they cost a considerable amount. With my motor and battery setup what size fuse would be ideal?
Thirdly, I don’t know what gear ratio would be wise for my setup? I see on the market they have a variety of gear ratios but don’t really understand how they directly affect my setup. If anyone could enlighten me that would be brilliant!
I would appreciate all recommendations! If my battery and motor selection is not amazing please let me know
Search for Calculator and you will find what gearing you desire. But the diameter of the kegels are also important, so that your wheel pulley has enough space to the ground.
If speed is not your goal I would go with a lower kV like 150-190.
The sk3 are unsensored motors. Pretty solid, but you will need a small push from stand still to take off. If you don’t mind than it’s ok, if no, better get sensored. If you want to stick with hobbyking get the sk8 motors.
I would have a look at the graphen lipos, they more expensive, but also perform better and hold more charge cycles.
With those vescs you need to set your bat max current below 35a to don’t overheat them.
I would have a look for used focboxes instead.
There also other oportunities but for this we need to know how much you want to spend on the vescs.
Don’t think I could put both motors next to each other with my trucks. Was planning to mount one like yours and the other on the underside of the board.
Yap the motors are the right ones.
Maybe go with 149kV version.
I can’t speak out of personal experience, but from what I read here people had some issues in the beginning with the sk8 but lately they seem to be solid.
Sk3 and sk8 are longer than the motor size point out, so have a look in the specs what’s the real length so that you can fit it on your trucks.
If you go with the Flipsky dual 4.20 plus than 80a is more than enough.
You can have a look on the data sheet in mouser.
Those are slow blow fuses, I can’t say you exactly but the 80a fuse can handle 100-120a for more than 10s if I remember right.
So that should be enough.
I use the 100a on my mountain boards and that is pretty good there.
The Flipsky vesc 4.20 dual plus seem to be way more reliable than the dual 4.20 and there is no big price difference.