Crazed inventor rides geared unicycle

I got the wheel back from the wheel builder today and then built the geared unicycle tonight.

http://www.harper.unicyclist.com/FiniUni.htm

THIS UNICYCLE SCREAMS!! It is sooooooo fast! I need to buy an asbestos suit to keep from scorching myself at these high Mach numbers. It was VERY difficult to freemount which is no surprise since it doesn’t act like a 24" wheel…it just looks like one. I didn’t notice the seat being pushed out from underneath me or any torque around the seatpost axis as I had feared. The measured backlash at the pedals was 0.055" which was more than the 0.020"-0.040" that I expected but I did have to add some slop in the planet shafts. I have been riding a giraffe lately and the backlash of this geared hub is much, much less than the chain slack of a giraffe. I put a 24" by 2.125" Kenda tire on it which is too fat for the Torker frame and rubs on one side. I will switch to a 1.75" tire soon.

Yes…you may ride it at NAUCC and UNICON in July. I will get some seats and seatposts and jazz the now el-cheapo unicycle up with some higher end components now that I know it works. I’ll try not to break it before that.

Harper–

 Whoo Hoo ! ! ! you're officially in the Unicyclist's Hall of Fame (right? :) )

 An excellent ending to a most fascinating story.  It's been exciting following your progress and quite exhilarating to see you finally finish.  Thanks for being so faithful to posting your progress on your site.

hmm…now I just have to figure out how I’m going to pull together enough money to go to NAUCC and UNICON so I can try this thing out.

Congrats, Greg. I am very impressed with this whole project.

The pictures didn’t show up, though. It looks from the html source as
though it’s looking for a file locally on the C: drive for the pictures
and one of the links. I’m definitely eager to see it, so I thought I’d
mention that.

John

harper wrote:

> I got the wheel back from the wheel builder today and then built the
> geared unicycle tonight.
> http://www.harper.unicyclist.com/FiniUni.htm

Harper,

Congrats Too and Job Well Done!:smiley:

I also couldn’t see the pix.

Work the maze.

I had to have a peak at those pics and managed to track them down to:

http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/whlrt.JPG
http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/whltp.JPG
http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/unirt.JPG
http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/unilt.JPG
http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/unifrm.JPG
http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/guni.jpg

Brilliant Harper! Quite quite brilliant :slight_smile:

Neil

-----Original Message-----
From: rsu-admin@unicycling.org [On"]mailto:rsu-admin@unicycling.org]On Behalf Of
teachndad
Sent: 19 February 2002 12:58
To: rsu@unicycling.org
Subject: Re: Crazed inventor rides geared unicycle

Harper,

Congrats Too and Job Well Done!:smiley:

I also couldn’t see
the pix.

Work the maze.


teachndad
Posted via the Unicyclist Community - http://unicyclist.com/forums


rec.sport.unicycling mailing list - www.unicycling.org/mailman/listinfo/rsu

Okay… those links didn’t quite work when I sent them in via email so here’s the forum attempt

http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/whlrt.JPG

http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/whltp.JPG

http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/unirt.JPG

http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/unilt.JPG

http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/unifrm.JPG

http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-Photos/guni.jpg

Cheers,
Neil

Harper,

Congrats on the working prototype! Sounds fun! You should fix the image links though.

Do you know anybody with a camcorder? Or even one of those Sony still cameras that can take 15+ seconds of movie footage?

I’d love to see you pedaling that thing around, even for 3-4 seconds.

Again, congrats! It looks cool.

Lewis

I think I fixed the links. If I had half a brain they would have worked right the first time. I’ve had this problem before and had to not only edit the links but also delete and then reload the photos into the right location. I’ve had better luck with MS Explorer than Netscape.

I forgot to list the completed weight which was 15 pounds 5 ounces or 7 kg.

Please let me know if you can find these photos with the link I gave originally:

http://www.harper.unicyclist.com/FiniUni.htm

Thanks.

Harper,

I see the images inline on your page perfectly now. Very cool!

So, I’m new to unicycles. How does that weight (7kg) compare to other street unicycles (I’m assuming this would be a street cycle)?

Lewis

Re: Crazed inventor rides geared unicycle

I highly recommend that be an asbestos leasure suit. Ya, that’s right- bomp- chika - chaw! Oh- YA!

Christopher

How did the frame flange end up working? Is it plenty tight and strong enough? Was it screwed together (as planed?)? :slight_smile:

Christopher

Well done, Harper!
You’re an inspiration.

How long 'till we see epicyclic unicycles at unicycle[.uk].com ? :slight_smile:
When are you going to put one on a coker and break some records (or
limbs…) ?

Andrew
0xADF

“harper” <forum.member@unicyclist.com> wrote in message
news:a4svcb$r6p$1@laurel.tc.umn.edu
> I got the wheel back from the wheel builder today and then built the
> geared unicycle tonight.
> http://www.harper.unicyclist.com/FiniUni.htm
>
> THIS UNICYCLE
> SCREAMS!! It is sooooooo fast! I need to buy an asbestos suit to keep
> from scorching myself at these high Mach numbers. It was VERY
> difficult to freemount which is no surprise since it doesn’t act like
> a 24" wheel…it just looks like one. I didn’t notice the seat being
> pushed out from underneath me or any torque around the seatpost axis
> as I had feared. The measured backlash at the pedals was 0.055" which
> was more than the 0.020"-0.040" that I expected but I did have to add
> some slop in the planet shafts. I have been riding a giraffe lately
> and the backlash of this geared hub is much, much less than the chain
> slack of a giraffe. I put a 24" by 2.125" Kenda tire on it which is
> too fat for the Torker frame and rubs on one side. I will switch to a
> 1.75" tire soon.
>
> Yes…you may ride it at NAUCC and UNICON in July.
> I will get some seats and seatposts and jazz the now el-cheapo
> unicycle up with some higher end components now that I know it works.
> I’ll try not to break it before that.
>
>
>
>
> –
> harper
> Posted via the Unicyclist Community - http://unicyclist.com/forums

The frame flange was a cut and fit project using the designed frame tab out of 0.075" stainless sheet and a clamp wrapped around the fork to fit made from 0.050" stainless. It is screwed together using button head screws, 8-32 x 1/4. It is tight and strong enough.

I can’t see these images using Netscape 4.79 although I used the composer from Netscape to last edit the page. I can see them with Netscape 6.x and MS Explorer. Anyone know why this would be?

Neil wrote:
> Okay… those links didn’t quite work when I sent them in via email so
> here’s the forum attempt
> http://www.harper.unicyclist.com/Epicyclic Hub Project/Hub-
> Photos/whlrt.JPG

Neil (et al.)

The links worked for me (using Netscape) as long as I replaced the
spaces with “%20” (without the quotes).

Regards,
Mark.

Fujitsu Telecom Europe Ltd,| o
Solihull Parkway, | In the land of the pedestrian, /|\
Birmingham Business Park, | the one-wheeled man is king. <<
Birmingham, ENGLAND. | O

Oow oow, will this be the last installment of our serial story? <snif>
Well then, thanks Harper for throwing this technology push at our
developing sport, and for the excellent way you did it at that (both
technically, as far as I can judge, and communication-wise).

The fixed pic links work fine. I would say that the unicycle looks
conspicuously normal to the casual observer. I’m afraid I won’t come
to NAUCC or UNICON to try it but I’m sure it would be a blast to ride.

You said it’s very difficult to mount. Would that be because you see a
24" wheel, therefore you act as if it is one? I reckon it would be
easier to mount than a Coker (same distance per rev but lower height)
if only you could put your reflexes aside. Or learn new ones.

Congratulations once more on a great project!
Klaas Bil

On Tue, 19 Feb 2002 16:37:52 +0000 (UTC), harper
<forum.member@unicyclist.com> wrote:

>Please let me know if you can
>find these photos with the link I gave originally:
>http://www.harper.unicyclist.com/FiniUni.htm

>

>Thanks.
>
>
>
>
>–
>harper
>Posted via the Unicyclist Community - http://unicyclist.com/forums


“To trigger/fool/saturate/overload Echelon, the following has been picked automagically from a database:”
“THAAD, furby, FBI”

A normal, cheap unicycle is about 12 pounds, or about one geared hub lighter than the one I just built.

I will be breaking limbs, not records…I’m a wimp rider.

I don’t think it will be cost effective to mass produce these for the relatively small market that is interested. As I mentioned before, the time and money invested (mostly time) makes these two hubs worth about $1500-$1800 US each. I will look into the costs of making a bunch of them. More interest would be generated by a two-speed shift-while-stationary hub. It will be interesting to see what the response is like with the willing test riders at NAUCC and UNICON.

No, this will not be the last installment. I have promised to photograph the assembly of the second hub which will be put together dry and in some manner rendering it possible to reopen easily. I will also get some photos of me riding it with the wind in my hair and a look of terror on my face from the excessive speed.

I believe that I have the images all viewable now from the original link. I think that Netscape doesn’t like spaces in the paths.
Let me know if you can’t get there from here:

http://www.harper.unicyclist.com/FiniUni.htm

Congratulations from me too! The cycle looks like a model of simplicity.
Maybe we can get an idea of weight difference by comparing the finished
cycle to a “standard” Sem XL or Troxel?

As for covering your expenses on the second (or third, or 100th) hub, how
would you like to auction it at the conventions this summer? If you’re
feeling generous, when the price exceeds a given amount (set by you), you
could donate the rest to the convention organization if they are running in
the red.

Plus, a wide range of people will have a chance to bid, which could create
quite a scene!

Stay on top,
John Foss
President, Unicycling Society of America
President, International Unicycling Federation
jfoss@unicycling.com
www.unicycling.com

This uni is amazing. Turning a 24" wheel into a 36" is excellent, but it would be more versatile if it had what you call a “two-speed shift-while-stationary” hub.

As someone with short legs that, I believe, will never be able to accomodate a 36" uni, this uni design gives me hope.

Can we call this uni design the “Harp-uni”? “Harpoon-i”?

20" to 30" to 45"?
16" to 24" to 36"?
26" to 39"?
32" to 48"?

Can you say “Fast”?

Congrats!

Don_TaiATyahooDOTcoDOTuk, Toronto, Canada

John-

This seems like a good idea. I was concerned because several people had expressed an interest in the second hub. This was not a for-profit venture and I thought I would be lucky if it became a break-even venture. The response from interested buyers was surprising and I didn’t want to make a small killing and leave a handful of people disappointed. This way, I could recover my costs and the convention organization or the USA could benefit from any profit whether they are running in the red or not. The out of pocket expenses for me to build the two hubs and the finished unicycle is around $480 so far. I plan to buy three viscount saddles (three different colors, of course), one each with a 200mm, 300mm, and 400mm United seat post for test riders of different sizes which will add about $90. So, at just under $600 I’ll be in the clear and be able to donate the spare seats to the Panther Pride Demo Team.

Once again, congratulations. I think you should make a few more of these so we can bid on them. I’m still a little upset about losing the big on that giraffe to you, ohh well. I’d definately buy one of these before a Coker and I’m sure many others would too. Keep us up to date.