Announcement

Collapse
No announcement yet.

The Fastest Uni Hub on the Planet. Can I finish for Unicon 18?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • vookash
    replied
    Thanks Terry for revising this thread. I missed the Unicon updates.
    The uni weights like several unis but still it rides nicely. The feeling at the beginning is bit like starting in high gear on Schlumpf, but then when you add the assist it rides so well. I tried it only for a little while and corners were troublesome for me, but I guess it's something you can get used to.
    Thanks Justin for the opportunity to try such a cosmic uni (even if this one looks so much casual than the machine you had in Montreal).
    And whoa Scott, you are fearless!

    Leave a comment:


  • MuniAddict
    replied
    What's the total weight?

    Leave a comment:


  • Justin LE
    replied
    Road Touring

    Anyways for me the main personal use and goal for this unicycle is not speed records so much as having the ability to cover distances and commutes that I normally otherwise wouldn't have considered.

    Where we were staying in San Sebastian there was what looked on the maps like a nice ride westwards with some good elevation climb to the town of Orio, which made for a ~40km return trip going from sea level to 1150 feet each way along a ridgeline overlooking the water.

    Click image for larger version

Name:	Orio Route Map.jpg
Views:	1
Size:	120.7 KB
ID:	2458345

    Corbin was game for this ride so we did it together with him on the Schlumpf 36. Of course I had a big advantage on the uphill climbs but on the flats we were pretty well matched for speed, while going downhill I tended to keep in the <30kph comfort zone generating 300-400 watts of power into the battery via regenerative braking, while Corbin would fly forwards at 40+ kph.
    Click image for larger version

Name:	With Corbin on Camino Climb.jpg
Views:	1
Size:	248.2 KB
ID:	2458341

    Most of the ride was on nice country roads but on the return we ventured up what looked like an alternate crudely paved path that became a section of the Camino de Santiago hiking trail, where rideable sections were few and far between.
    Click image for larger version

Name:	More Camino Trail.jpg
Views:	1
Size:	347.7 KB
ID:	2458344

    Corbin shot some video footage and uploaded it here:
    https://www.youtube.com/watch?v=BSSF...ature=youtu.be

    The total regen stats were pretty good, but part of that is because we hiked rather than rode up most of the elevation gain on the return trip when were were on the Camino trail. Had we taken the roads it would have been more like ~30% regen.
    Click image for larger version

Name:	43 Percent Regen.jpg
Views:	1
Size:	124.4 KB
ID:	2458342

    One other detail that I found interesting is that the human watt-hours and electrical watt-hours have almost always matched up nearly exactly 1:1 every time I've taken this unicycle for a ride. It's the same riding on the flats in the city or going on this long tour with plenty of up and down. At the end of the trip, half the energy came from my legs and half from the battery, and that's a ratio I'm pretty happy about.
    Click image for larger version

Name:	Watt Hours Compared.jpg
Views:	1
Size:	103.8 KB
ID:	2458343

    Leave a comment:


  • UnderTheLake
    replied
    Oh Scott.... no pads but your helmet... God bless the fearless. Nice riding, as always.

    Leave a comment:


  • Ben_Ceyssens
    replied
    That's crazy! Would love to ride that someday

    Leave a comment:


  • Justin LE
    replied
    Speed Barriers

    Originally posted by Justin LE View Post
    So far it's generated a lot of interest at Unicon but nobody has broken 40kph yet, I'm still working to convince the skilled riders to put some more faith in my engineering here
    So I used it on the 10km street race early in the event, but since it was wet and raining outside and this was the first real ride for me on it in Spain it took a good 4-5 minutes on the course before I really got comfortable. I finished the 10K in exactly 22 minutes, so not nearly as fast as the top riders who were right around the 20 minute mark. And my top speed was 36.3 kph, so still a ways from 40.
    Click image for larger version

Name:	10K Race End.jpg
Views:	1
Size:	240.3 KB
ID:	2458339

    Martin who won the 10K race by a huge margin also gave a spin on the geared electric unicycle after the uphill event, but I think he was more interested in playing around with the assist and regen levels than breaking any speed barriers, or he didn't want to have a nasty crash before the final competetions had all wrapped up.
    Click image for larger version

Name:	Martin Climbing.jpg
Views:	1
Size:	176.4 KB
ID:	2458336

    I took it to the track and field oval hoping that this might be the right spot to find someone with the balls and protective gear to crack 40kph, and Josselin proved a willing participant
    Click image for larger version

Name:	Josselin on Track.jpg
Views:	1
Size:	251.6 KB
ID:	2458335
    And he came soo close repeatedly hitting 38 kph on the straight segments of the oval, but it wasn't getting any faster than this.
    Click image for larger version

Name:	38 kph.jpg
Views:	1
Size:	73.6 KB
ID:	2458334

    Then at last I caught up with Scott Wilton at the unicon village on my last day there. Scott had tested the first prototype non geared electric unicycle at the 2010 muni weekend in Vancouver, is pretty much fearless of speed on 1 wheel, and I was hoping would find this one a comfortable fit to push to its limits.
    Click image for larger version

Name:	Scott Arriving.jpg
Views:	1
Size:	273.9 KB
ID:	2458337
    He disappeared up the road beside the stadium, came flying back a couple minutes later, and smashed my best expectations, getting 45.2 kph (28mph) on the flat run while also dodging people mingling on the street.
    Click image for larger version

Name:	45 kph.jpg
Views:	1
Size:	245.7 KB
ID:	2458338
    Yipee! Hats off to you Scott
    Last edited by Justin LE; 2016-08-06, 01:43 AM.

    Leave a comment:


  • Justin LE
    replied
    Test Riding

    Originally posted by Juni View Post
    I wish I could be there to have a try... It really is a masterpiece *drool*
    Well sorry that you didn't get a chance this time around, but if you are in the US I'll have it (or a future model) at the 2017 NAUCC event in Seattle next summer. The good news is that lots and lots of people at Unicon did get to give it a go and the feedback was super useful and for the most part positive. For anyone who had significant Schlumpf experience it was no problem to hop on and ride, but there were even a few people who had never ridden a geared hub before and managed after just a minute or two to be pretty comfortable on the machine.

    Here we were at the city where the downhill competitions were held. The guy coming off the unicycle Christoph has also built his own internal geared hub with the ring and sun gears reversed so that it has like a 2.5:1 ratio, which unfortunately I didn't get a chance to see but he'll be racing with it in the marathon ride tomorrow.
    Click image for larger version

Name:	Testing Queue.jpg
Views:	1
Size:	212.5 KB
ID:	2458333

    Katja from Germany had visited our Vanuni club in Vancouver several years ago and really schooled us in hockey, and it was nice to see her again.
    Click image for larger version

Name:	Katja.jpg
Views:	1
Size:	182.9 KB
ID:	2458331

    I was also really in Roger's opinion on this project, especially as he's known for spinning fast with short cranks on big wheels. He found the automatic assist a bit weird and preferred having the pedal torque multiplier turned way down and using the up/down button for steady power assist. While for most people, the torque multiplier from the motor is what is needed to make it rideable.
    Click image for larger version

Name:	Roger Davies.jpg
Views:	1
Size:	316.2 KB
ID:	2458332

    And Finally, Anne-Sophie has grown quite skeptical of testing any my unicycle creations since getting injured on my earlier prototypes some 5 years ago. But after sooo many people at unicon were giving the thumbs up on this one she at last gave it a go and cracked a smile too:
    Click image for larger version

Name:	AnSo Riding.jpg
Views:	1
Size:	233.6 KB
ID:	2458330

    Leave a comment:


  • Justin LE
    replied
    Originally posted by wheeee View Post
    Some fantastic engineering there. Impressive work!
    Thanks.

    I wonder if you can answer a question for me? I have been thinking about how unicycle hubs are constructed, specifically, how the axle is connected to the flanged hub part?
    On the all-steel nimbus hubs like this they are welded on, and you need to be a bit careful about that detail when machining them down. Not only is there a risk of removing too much of the weld bead, but the material properties are different on the welded area and sometimes that results in damage to the cutting bit.

    Other hubs are made with interference press-fit parts, and aluminum hubs (like mad4one) would typically be machined either from solid bar stock or from a forging.

    I am currently building a little Arduino based CNC machine with the first goal of machining some bearing parts so that I can construct my own frame. Beyond that, I would like to look at making my own hubs. Any thoughts?
    Machining the hub and hub flanges is the easy bit, but the spindle with the ISIS splined taper would be a real challenge. I've never bothered to attempt this and have always hacked up old spindles (either from bicycle BB's or from other uni hubs) or doing these custom unicycle hub projects.

    A square taper spindle seems easier to machine than ISIS, but would have to be a strong metal like steel or titanium.

    Leave a comment:


  • wheeee
    replied
    Some fantastic engineering there. Impressive work!

    I wonder if you can answer a question for me? I have been thinking about how unicycle hubs are constructed, specifically, how the axle is connected to the flanged hub part? I am currently building a little Arduino based CNC machine with the first goal of machining some bearing parts so that I can construct my own frame. Beyond that, I would like to look at making my own hubs. Any thoughts? Thanks for any information

    Leave a comment:


  • MuniAddict
    replied
    Uh-MAZING! That's pure genius!

    Leave a comment:


  • Juni
    replied
    I wish I could be there to have a try... It really is a masterpiece *drool*

    Leave a comment:


  • Justin LE
    replied
    Originally posted by Vertigo View Post
    Nice! Hope to catch a glimpse of it at Unicon.

    Will it travel with you as checked luggage? If so, I hope there are no problems with security.
    Well, it turns out that I did have problems with my flight to Unicon but not related to the unicycle, rather my passport went missing at the worst possible time! So had to get a rush/replacement on that and had an extra couple days in Vancouver to do some more upgrades before the event.

    Rather than have the batteries hanging from a bag in the handlebar, I welded up an extra set of tubes to the frame so that they could be properly supported behind the unicycle. This also linked the two frame tubes together which increased the overall frame stiffness a good amount.
    Click image for larger version

Name:	Welding Battery Rack Tubes.jpg
Views:	1
Size:	194.2 KB
ID:	2458324

    I found a perfect sized seat bag from a bike shop to fit in this area which can hold up to 4 of the small 100Wh packs, and the result is pretty clean.
    Click image for larger version

Name:	Full Build for Unicon.jpg
Views:	1
Size:	287.0 KB
ID:	2458323

    It also gave us some time to make a little film showing the unicycle in action
    https://www.youtube.com/watch?v=-C1n6XAypag

    So far it's generated a lot of interest at Unicon but nobody has broken 40kph yet, I'm still working to convince the skilled riders to put some more faith in my engineering here

    Leave a comment:


  • Vertigo
    replied
    Nice! Hope to catch a glimpse of it at Unicon.

    Will it travel with you as checked luggage? If so, I hope there are no problems with security.

    Leave a comment:


  • Killian
    replied
    That's amazing.

    Leave a comment:


  • harper
    replied
    You repair parts and make modifications faster than most people can post on the forum. I was just going to suggest that you peen the pins into the aluminum plate and you've already machined a steel one and spot welded them. You rock, Justin.

    Leave a comment:

Working...
X