Does the increased power/torque of the XR change nosedive likelihood?
Glyph last edited by
@makermarc - my only prior bad spill was due to speeding too fast down a dark road I didn't know, and hitting a big bump that I didn't know was there at speed. Definitely a dumb error, but I got lucky that my equipment protected me.
I haven't been back to where my arm-breaking accident occurred, but I'd like to see the pavement there (it'll be one of my first destinations) - I was again riding at night and the road was not very familiar to me so even though I wasn't going (IMO) fast (as I said I was just coming off a dead stop), I do wonder if there was some uneven bit of pavement that overtaxed the board trying to rebalance itself while also accelerating, and/or caused me to bobble my stance and overweight the front of the board.
It all happened so fast, and afterwards I was too consumed with pain and trying to get myself and my gear out of the street and figure out how I was going to get myself home and to the ER, to do proper accident investigation.
One thing I've already done, is gotten a durable, bright, breakaway lighting rig to attach to the board, so when I'm riding at night the pavement around me should now be clearly lit. It wasn't cheap, but if it could have prevented this, it would have been a bargain. I'm also going to add a bicep pad to my leading arm, since in my experience if you can't run it out, that's probably where you're landing.
@glyph Long story kept long: Maybe, but most likely not noticeably enough. Digging into the future motions patents gives an insight on how the OW + vs V1 motors are built.
OW+ being about 2 pounds lighter, and having 5 Celcius better temperature performance at the same wattage, (simulations were done at 500W for both).
This increased temperature conductivity is probably how they pulled off using the same engine at 750 W instead of 500W, (remember that the V1 does have ~1500W momentary power, [ultimatley wattage is just how much Voltage and Amps you run through the motor]).
Anyway, getting back to the subject at hand. The improved thermal efficiency has probably been maxed out with the OW +, assuming all equal except the battery pack, we could see momentary increases in torque during cold starts, but as soon as the motor is up to temperature, I believe that will be the limiting factor.
The Battery chemistry is also different, NMC have a lower specific power than LiFeP04, but higher energy density. (Like running a small hose at high pressure, instead of a big hose at low pressure) On the other hand NMC (small hose high pressure, has a larger water tank. )
Issue 2: also by digging through the patents.
There are hints of the foot pads acting as an approximate weight sensor, which tunes torque(amps) feed to the users weight. This could give the rider a preliminary sense of confidence, as the board will compensate for a rider with more... em.. potential energy (weight) , but again, once the temps get maxed out, the board will save your investment from itself, and let you take the hit.
makermarc last edited by
@drn3rd Actually, they don't need the footpad sensor data to estimate rider weight. That can all be done through monitoring the torque request vs. acceleration obtained. With all other things being the same, it's easy to make an estimate based on the energy being used.
I'm sure it is more difficult for the board to keep up with a heavy rider in high-torque situations, but ultimately, the board will reward the smoothest rider, not the lightest one.
@makermarc Agreed. I was just paraphrasing what the patents mention.
I would guess that, if the weight estimation is being used, it would be for something like a base value for torque requirements at start, i.e "motor engagement". But as patents go, these are mentioned in could's and if's.
makermarc last edited by
@drn3rd Lots of interesting stuff in those patents!
Looks like they have official terminology describing how the pushback is calculated (based on the "power margin indicator")
@makermarc I love the way "pushback" et al, is describe in patent form.
dbro last edited by
Awesome, a patent with some actual information. I noticed poking around the OW+'s Bluetooth Low Energy API that it reports a live "Safety Headroom" value between 0-100. I'm working on a handsfree iOS app now to allow you to monitor that, battery, speed, foot sensor status etc. via an earbud and would really appreciate anybody who could help test. Send me a DM with your email and I'll add you to the beta group. Will announce more generally when it's a little more polished.
Or if you're a developer type, build it yourself here: https://github.com/OnlyInAmerica/OneWheelMonitor
glisse84 last edited by
@dbro Great idea!
I am interested however i haven't yet my new XR ;-)
I had received the OW + but it didn't work and, discovering this forum, I realized that the OW wasn't that safe as I had no idea about the "Nose dive" concept.
I hope your App' will also work with the XR
readysetawesome last edited by readysetawesome
even at lower speeds, if people stomp too hard with a more powerful board (where software is enabling more torque) they will in some cases be MORE likely to nosedive due to wheelslip, depending on the terrain and rider weight.
@dbro Hey Dbro if you want to dig deeper
Is basically a collection of their patents