Flux hollow core longboard (update!)

[onloop]

This board is sporting an 8s system. I am running a board with close the same specs as this and I am lucky to get 1 hour of ride time. However, I average 20-25mph 30-40kph when I ride.

8s10p? And you only get 1 hr? How many WH is this pack? Are you sure you average speeds of near 40Km/h.... in normal riding around the street, stopping and starting, navigating around pedestrian & cars, to achieve such high average this would require a top speed of near 75kms/h (based on my personal stats)

My top speed is set around max of 45kmh with average of about 25kmh... its impossible for me to travel at max speed constantly. Unless you are riding on a velodrome?

I get over an hour on 10S3P which is 270wh.

Can you you say what type cell they are?

Also. I am curious about using so many fuse wires... most of these quality brand of 18650 are very stable.. it might be unnecessary.

 

[chuttney1]

What brand of 18650 are you using?

 

[chaka]

8s10p? And you only get 1 hr? How many WH is this pack? Are you sure you average speeds of near 40Km/h.... in normal riding around the street, stopping and starting, navigating around pedestrian & cars, to achieve such high average this would require a top speed of near 75kms/h (based on my personal stats)

My top speed is set around max of 45kmh with average of about 25kmh... its impossible for me to travel at max speed constantly. Unless you are riding on a velodrome?

I get over an hour on 10S3P which is 270wh.

Can you you say what type cell they are?

Also. I am curious about using so many fuse wires... most of these quality brand of 18650 are very stable.. it might be unnecessary.

This board is built with samsung 2600mAh cells, if you look closely you can see the pink cells inside the shrinkwrap. Those red cells are crappy sanyo's I used for mockup while i made the packs. The pack on this board has a capacity of 26000mAh so if you account for voltage sag to 3.6 per cell I would expect something under 750wh.

I have my personal board peaking out around 35mph/56kph, I come from a downhill longboarding background so even at this speed it feels pretty chill for me. You really pull a ton of amps at high speed due to wind resistance plus I tend to just stab the throttle everywhere I go. I suppose I lack the maturity to ride conservatively.

 

[torqueboards]

80 cells 2600mah 8S10P

3.7v * 80 cells * 2.6ah = 769.60wH
3.7v * 8 cells * 26ah = 769.6wH

From Ben's assessment it looked at about 5wH will get you .31 miles or .49 km.

769.60 / 5 = 153.92

153.92 * .31 = 47.7152 miles range from 8S10P 2600mah 80 cells 26000mah
153.92 * .49 = 75.4208 km range from 8S10P 2600mah 80 cells 26000mah

Ben's assessment from my own estimations seemed spot on. I seem to get exactly 6-7 miles from a 6S 5000mah pack. This is with regular riding uphill/downhill with usual regular speed of about 10-15mph and the occasional 20-25mph stretches with occasional heavy throttles.

A 6S 5ah pack 22.2V * 5 = 111wH / 5wh = 22.2
22.2 * .31 = 6.882 miles
22.2 * .49 = 10.878 km

So I assume with Chaka's pack. You could easily get 30-45 miles easy. Unless, your going at like 35mph for 1 hour but that would never happen for me

 

[onloop]

Motor pulley 15 t
Wheel pulley 36t
Battery voltage 30 (8s nominal)
Motor kV 270
Tire diameter [mm] 90
Top speed 57 km/h

Is this what your running? What motor? Does it get hot?

 

[chaka]

Motor pulley 15 t
Wheel pulley 36t
Battery voltage 30 (8s nominal)
Motor kV 270
Tire diameter [mm] 90
Top speed 57 km/h

Is this what your running? What motor? Does it get hot?

I am running 20/32 tooth pulleys on a 192kv motor and yes it does get hot, too hot to touch when doing a lot of lower speed acceleration. Not too bad when going flatout. I'm sure most people will get at least 2-3 hours ride time with this pack, maybe more.

 

[dashimsta]

The numbers you are claiming are just ridiculous. Before spending all this time and money making custom 80 cell batteries and custom electronics as you so proclaim, maybe you should figure out your motor situation since 192kv at 8S is just not efficient and your 20/32 gearing is stupid. Your motors WILL NOT LAST. Why are you not running 12S? With all this custom work it makes no sense that you aren't. More over, these outrunners have torque but they dont have that much torque and I bet your board wants to COG unless you push to start with that 20/32 gearing and 192kv.

Your claim of going thru a 750Wh battery in an hour means your sucking up 1HP for 1hr constant. Im calling bullshit! On one of my boards running 8S 192kv at top speed of 28 mph its pulling less than 20 amps and there are many members here who can provide graphs of very similar numbers. 20A * 25V = 500W not 750

It sounds like your cells arent actually 2600mah and have less capacity than advertised

 

[chaka]

The numbers you are claiming are just ridiculous. Before spending all this time and money making custom 80 cell batteries and custom electronics as you so proclaim, maybe you should figure out your motor situation since 192kv at 8S is just not efficient and your 20/32 gearing is stupid. Your motors WILL NOT LAST. Why are you not running 12S? With all this custom work it makes no sense that you aren't. More over, these outrunners have torque but they dont have that much torque and I bet your board wants to COG unless you push to start with that 20/32 gearing and 192kv.

Your claim of going thru a 750Wh battery in an hour means your sucking up 1HP for 1hr constant. Im calling bullshit! On one of my boards running 8S 192kv at top speed of 28 mph its pulling less than 20 amps and there are many members here who can provide graphs of very similar numbers. 20A * 25V = 500W not 750

It sounds like your cells arent actually 2600mah and have less capacity than advertised

I'll have to wire up a watt meter and see what I'm pulling, or not. I already know I'm getting close to 1 mile per Ah. I'm sure a few forum members will chime in with their mileage soon. Personally I don't think there is anything wrong with my gearing, I wouldn't recommend it to anyone. It is definitely stupid fast. What is wrong is I need to switch to dual motor setup. Cogging?...The motor will straight up seize on you if you gun it too soon.

You will probably see more people like me cross over to electric boarding as more and more downhill riders join the flock. We tend to break things, sometimes ourselves and if we see you without a fullface when you ride with us we will get on your case.

 

[onloop]

The numbers you are claiming are just ridiculous. Before spending all this time and money making custom 80 cell batteries and custom electronics as you so proclaim, maybe you should figure out your motor situation since 192kv at 8S is just not efficient and your 20/32 gearing is stupid. Your motors WILL NOT LAST. Why are you not running 12S? With all this custom work it makes no sense that you aren't. More over, these outrunners have torque but they dont have that much torque and I bet your board wants to COG unless you push to start with that 20/32 gearing and 192kv.

Your claim of going thru a 750Wh battery in an hour means your sucking up 1HP for 1hr constant. Im calling bullshit! On one of my boards running 8S 192kv at top speed of 28 mph its pulling less than 20 amps and there are many members here who can provide graphs of very similar numbers. 20A * 25V = 500W not 750

It sounds like your cells arent actually 2600mah and have less capacity than advertised

WOW!... take it easy mate....

i agree that some of the number don't add up... but that's just comparing to my own personal results, it does not mean the data being represented is false... so i suggest you tone it down a tad 8)

I do believe the drive train is not efficient at 1:1.6 reduction, i would imagine there is lots of heat loss. which has been confirmed. A watt meter reading would be interesting.

also we don't know the wheel diameter or the rider weight.

 

[okp]

You will probably see more people like me cross over to electric boarding as more and more downhill riders join the flock. We tend to break things, sometimes ourselves and if we see you without a fullface when you ride with us we will get on your case.

I have no opinion on the battery stuff but I fully second you on this quote. It reminds me of one famous quote

=> Break the rules, but first break the rulers

Thanks for this, I will put that on my next t-shirts

 

[bandaro]

So to be one of those guys chiming in with their mileage:

5s, 10AH lipo gave me about 6km on my last ride with a 3.4v/cell cutoff. So that's about 4 miles? Unlike chaka I was cruising slower, at around 35km/h (about 25mph), and had a few starts stops. Also, if I gun it too soon my motor's don't seize - I hit my arse. Tis bad. I could easily cruise at 50 with the 6s setup I used, but a cell died

I would say pulling 750 watts is very easy if you were to take some of the rural/quiet roads, same style as you do on a regular board, just less downhill. You could comfortably sit at 45+km/h, while if you are playing with most city traffic you couldn't/wouldn't. Giving a few kicks and taking of gently, cruising at 40 odd and then stopping and checking my watt meter shows I pulled a max of around 1300 watts. Unsure of what the cruising draw is though as the meter is in the battery compartment and just shows peak values. I think vedder made a video with live logging displayed? have to figure out how to do that...

Anyway, regarding the board, it looks cool but I feel 80 cells is more than most use so too heavy to carry about, I take it you can reduce the cell count?

 

[chaka]

So to be one of those guys chiming in with their mileage:

5s, 10AH lipo gave me about 6km on my last ride with a 3.4v/cell cutoff. So that's about 4 miles? Unlike chaka I was cruising slower, at around 35km/h (about 25mph), and had a few starts stops. Also, if I gun it too soon my motor's don't seize - I hit my arse. Tis bad. I could easily cruise at 50 with the 6s setup I used, but a cell died

I would say pulling 750 watts is very easy if you were to take some of the rural/quiet roads, same style as you do on a regular board, just less downhill. You could comfortably sit at 45+km/h, while if you are playing with most city traffic you couldn't/wouldn't. Giving a few kicks and taking of gently, cruising at 40 odd and then stopping and checking my watt meter shows I pulled a max of around 1300 watts. Unsure of what the cruising draw is though as the meter is in the battery compartment and just shows peak values. I think vedder made a video with live logging displayed? have to figure out how to do that...

Anyway, regarding the board, it looks cool but I feel 80 cells is more than most use so too heavy to carry about, I take it you can reduce the cell count?

I don't remember building a board for you Bandaro? Maybe you misunderstood me, I was referencing members with my boards/packs. The pack isn't really heavy, only about 6lbs/2.7kg. Pair that with my deck which is lighter than a conventional board and you are still riding at less than 20lbs/9kg. And to be honest I am not building boards for "most people". I am well aware that most people are perfectly happy with 5 to 6 miles of range, I am not. I also don't mind a heavy board and fully intend to bring a board with triple this capacity to the market, as small as that market may or may not be.

Tell me you wouldn't want to spend a week crossing the countryside with a true touring board. In any case my personal numbers are irrelevant. What matters is what my customers/testers report and that I continue to make them happy.

Another point that I have not touched on is efficiency. I see people looking for the most efficient motor but not much talk on efficiency vs discharge rate. For most 18650 models you get an increased usable capacity when you discharge at a lower C rate. It is true that the cells can become more efficient when they heat up from high discharge but this reduces the overall service life of the cells.

I see my boards/packs serving two types of people, those who want insane range without having to fuss with swapping batteries and those who need a huge amperage reservoir to fuel their adrenaline rush.

 

[CSN]

A large capacity board with a USB charge port can used to charge

Phones, camera's, BadWolf, lights, vape pens, girlfriends vibrator.

Be prepared!!!!

 

[chaka]

Almost finished fitting the aluminum top hatch, it will be fastened with many many tiny screws so I will be cutting a second smaller hatch over the ESC and receiver for ease of access. It sits flush with the deck inside a rabbeted recess.

 

[chaka]

Delivered another board this week and it is getting hard to put into words how awesome this project is becoming. Lets just say that after 20 miles on a modest gear ratio the resting voltage was about 3.85v per cell.

We have a different design on the bench right now, I'll try and bring a little more detail on the build as we fine tune our battery pack/boards.

 

[torqueboards]

Me me me me!

 

[chaka]

Shaping the new design on our router table, I really should put a cnc table together soon.

This model features cut wheel wells, more of a freeride board. It will also sport an 80 cell system, if you are going to spend the day riding you might as well use the whole day.

I installed a voltage display on the last board by utilizing the slot between the truck mounting holes. Plenty of space for one or two more digital displays for more telemetry, an amperage meter would be nice touch.

 

[CSN]

I'm loving my board

 

[torqueboards]

Awesome!... when's my turn lol jk no rush

 

[okp]

that's a sweet board ! what are the specs ?! what the price of one deck ?

 

[CSN]

This Flux is

38.75" long
10.25" wide

16 pounds(7.2 kg) . Board prior to trucks and motor.
23 pounds(10.5 kg) complete w 90 mm wheels. R-spec motor. TB's single Paris mount.

A little extra for Ekick light.

Range unknown at this point. Will post more this coming week. Could be epic.

It doesn't rattle or chatter. Nothing about it says IKEA or toy.

Super solid and stable. Like a electric car humped piece of fine furniture.

Have to hand it to Onloop for his R-spec also. It's so smooth and quiet.

 

[torqueboards]

That's a nice touch with the exit hole from inside the deck for the motor wires.

 

[whitepony]

with all these cavities and wood being wood: isnt a hollow board like that resonating at some frequencies maybe?

 

[chaka]

with all these cavities and wood being wood: isnt a hollow board like that resonating at some frequencies maybe?

I built these to tight tolerances, every bit of the cavities are filled with hardware and batteries. In the process of ordering the BOM for a small run of VESC's so I can stack them for a dual motor setup, not enough room otherwise.

that's a sweet board ! what are the specs ?! what the price of one deck ?

I am running a pretty sweet deal while we flush out all the design possibilities. I also offer trade-ins for future revisions, all you pay is the cost of the added hardware. Send me a PM for the details and let me know what level of build you would like.

Awesome!... when's my turn lol jk no rush

Your boards are on deck! Get ready for some serious stoke!

I'm loving my board

Be sure to hit me up for a trade-in once we finalize all the features! Can't wait to see what kind of range you get with this board.

More to come!

 

[chaka]

A little update on some added features I am working on right now. I found a good source for mini temp displays so we will now have battery temp monitoring in addition to the voltage display all mounted above the front trucks. You also get to choose the digital display color!