FOCUS GROUP: Lower weight, Longer range, Faster speed?



  • i thought about this tonight on my normal ride and I think weight would be the hardest to improve on. Where is the weight coming from? The aluminum frame must weigh less than steel. Carbon fiber would probably shatter so can they do lighter other than slimming the frame down? Then you have the wheel which I don't expect much could be done to lower the weight. Other than that you hVe batteries, controller and footpads which I would not expect a technology to help weigh less anytime soon. I guess tech improvements will probably come from battery performance first and motor performance second.



  • @Franky said:

    so can they do lighter other than slimming the frame down?

    There's a lot of slimming down that can be done with careful design. Here's a 982 gram bridge over a 1m gap which took a 443.58 kg load.
    600px-Spaghetti_bridge.jpg

    The hub motor will weigh several kgs. The wheels are designed for a 160km/h go-kart so will be over engineered for a 25kmh device.

    Weight is one of the key things that can be addressed with custom designed hardware. OneWheel does not do enough volume to justify custom so they used the best fitting commodity gear available. If it takes off and they are able to look at 10,000+ units then there would might be space for custom hub and custom wheels.

    Koenigsegg make carbon fiber wheels for their cars rated for 280 mph, each weigh 5.9kgs and can hold up one corner of a 1300kg car.
    https://www.youtube.com/watch?v=PGGiuaQwcd8

    Carbon fiber is not easily shattered.



  • @andrew holding weight is one thing. Absorbing a blow is another. I'm sure technology will help with this problem. I've just seen too many carbon fiber golf clubs shatter to want onewheel to use the material.



  • @Andrew I know from talking to FM before that with the exception of the tire, every single one of the parts is custom made. All the electronics and mechanical parts were designed and are being made by them. Even the motor was custom designed for the Onewheel

    I agree with @Franky, holding weight is very different to what a Onewheel needs to go through when used aggressively. With the amount of power on those batteries, a carbon frame shattering could end up in a catastrophic fire or very serious accident (not to mention the rider getting seriously hurt from carbon shattering and falling)



  • @jim fair enough - I still think I have that kid like ability not to break bones . . . despite fracturing my clavical last summer on my mtb - but I do like speed - I have hit 65mph on my park board on a good black (double black diamond in the states I think) and that was fun, even the time after where I wiped out a the bottom, and the time after that were someone cut me up at 60mph and I went flying into a lake . . . - pushback is fine, but I am wondering if they are limiting the speed somehow - think car engine chip to keep engine under emissions target

    why did the front nose dive? and ouch that sounds painful



  • @Newheel said:

    @Andrew I know from talking to FM before that with the exception of the tire, every single one of the parts is custom made. All the electronics and mechanical parts were designed and are being made by them. Even the motor was custom designed for the Onewheel

    All the electronics? It has an STM32F103V8T6 microprocessor made by STMicroelectronics.
    http://www.arm.com/innovation/products/onewheel.php
    This is a chip that was available in 2010 thus making it an off the shelf component. So not every part, and particularly not the electronics, is custom made.

    @FM during Kickstarter said:

    I can assure you that we are doing all we can to shave off lbs. Unfortunately most of our weight comes from the motor, and we are unwilling to sacrifice performance. We're hoping to get it closer to 20lbs when its all said and done.

    @FM during Kickstarter said:

    Building our supply chain (which is almost done) locking in our custom motor's, and developing the app among other things.

    Elsewhere they noted that the 500W motor is 500W continuous but peak power is 2000W. So it is a relatively high (to my mind) performance and already custom motor.

    So the motor is a significant weight component, high power and already custom. So shaving weight will require a better custom motor?!



  • @eish I believe the simple fact that I was pushing the board beyond the max speed of the motor, thus it could not accelerate any more to keep me balanced. This is why the sudden nose dive. In the current firmware versions you get a bit of push back in extreme mode so you know your near the limit of the board being able to auto-balance. Yes it was very painful, but I managed to recover ;-)



  • @jim Ah I see - its a shame the balancing and the wheel are not separate - have a main motor for the wheel and then an auxiliary one to control the balance - what happens if you are going down a big hill? (wales is rather hilly . . . )



  • @eish on hills you are leaning back and braking which is nice because it charges the batteries with regenerative braking. If you don't brake you will hit pushback and have to break or you will nose dive forward.



    1. Range (could easily keep on cruising)
    2. Speed (a couple of extra kph would be ace, not to mention a bit more acceleration if I really lean in)
    3. Weight (the weight is really fine for me, maybe a bit less would be good but, as is, it gives the board a really stable feeling)

    I reckon if we had more speed and power we would have less lock-ups but I heard the acceleration was reduced (I personally never experienced the first version of extreme so hard to say) I don't know if that was for safety or to reduce wear but yeah...

    ...following on, if we had less lock-ups maybe we could have bindings and if we had bindings we could have more carving potential and more jumping and tricks. Would probably need a dead-man trigger for bindings though... Pro model?



  • 1 Range
    2 Weight
    3 Speed



  • Yep, my top three are also in the order of:

    1. Range
    2. Weight
    3. Speed


  • None of the above.
    This isn't really a focus group.



  • Obviously in the minority...
    1 Weight
    2 Range
    3 Speed


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