Unicyclist Community

Go Back   Unicyclist Community > Unicycling Discussion > General Unicycling Discussions

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 2014-04-28, 05:22 AM   #1
TITANFLEX
Unicyclist
 
Join Date: Apr 2014
Location: Santee, California
Age: 67
Posts: 3
Geared Hub

I am designing a prone-suspension bicycle that requires crankarms attached to the axle of a geared hub...something like the attached images of Frank Bonsch's creations (posted 25-SEP-2007).

Can anyone point to the current state-of-the-art, or a perhaps a gifted machinist who might want to have a go at prototyping such a beast?

Cheers,
Tom Piszkin
Airo-Series, Inc.
www.TitanFlexBikes.com
Attached Images
  
TITANFLEX is offline   Reply With Quote
Old 2014-04-28, 05:43 AM   #2
saskatchewanian
ERIC P
 
saskatchewanian's Avatar
 
Join Date: Jan 2007
Location: La Ronge, Saskatchewan, Canada
Age: 34
Posts: 6,472
You are going to want to look for Schlumpf hubs. They have a 1.5:1 ratio and are shiftable on the fly. They are available with either a square tapered spindle or ISIS.

If it doesn't have to be brand new there are usually one or two for sale in the trading post. If you want new I am not sure if anyone keeps any stock in the US but there is at least one ISIS version at the canadian UDC store http://www.municycle.ca/kris-holm-sc...hub-p-904.html
or you can order direct from Schlumpf http://www.schlumpf.ch/hp/uni/uni_engl.htm
__________________
My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world. - Jack Layton
saskatchewanian is offline   Reply With Quote
Old 2014-04-28, 06:15 AM   #3
saskatchewanian
ERIC P
 
saskatchewanian's Avatar
 
Join Date: Jan 2007
Location: La Ronge, Saskatchewan, Canada
Age: 34
Posts: 6,472
I fell asleep thinking "what on earth could a high end road bike company want with a geared unicycle hub" and I woke up thinking: HIGHER GEAR! FREEWHEEL!

So here is something else you might find interesting:
http://www.unicyclist.com/forums/sho...d.php?t=112267


*back to bed*
__________________
My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world. - Jack Layton
saskatchewanian is offline   Reply With Quote
Old 2014-04-28, 01:36 PM   #4
TITANFLEX
Unicyclist
 
Join Date: Apr 2014
Location: Santee, California
Age: 67
Posts: 3
Hey Eric, Thanks for the reply. I've looked at the Schulmpf--not ideal.
We are willing to finance an R&D effort to produce what looks like UniFrank (Frank Bonsch) rendered several years ago.

Does anyone know how to contact him directly?

Cheers,
Tom
TITANFLEX is offline   Reply With Quote
Old 2014-04-28, 01:38 PM   #5
bouin-bouin
Didier
 
bouin-bouin's Avatar
 
Join Date: May 2008
Location: France in Europe (Le Chesnay - Yvelines)
Age: 54
Posts: 835
Do you need a freewheel ?
__________________
http://monocycle.info
http://www.leblogdumonocycle.fr/
CITY XTP 26", MUNI KH26" & KH29", ROAD Oracle 32" and KH36"
my goal : a 3 geared 29" to have only one uni for all kind of rides :-)
bouin-bouin is offline   Reply With Quote
Old 2014-04-28, 02:58 PM   #6
waaalrus
Unicyclist
 
Join Date: Oct 2009
Posts: 1,110
Quote:
Originally Posted by TITANFLEX View Post
Hey Eric, Thanks for the reply. I've looked at the Schulmpf--not ideal.
We are willing to finance an R&D effort to produce what looks like UniFrank (Frank Bonsch) rendered several years ago.

Does anyone know how to contact him directly?

Cheers,
Tom
It looks like it's been a couple years since Frank was active on the forums but have you tried to send him a Private Message through this forum yet? It's possible it's still hooked into a current email address. It looks like Frank's web site was hosted on a provider that no longer serves it. I did find some interesting CAD movies:

http://www.angelfire.com/film/unicycle/

In the movie titled "Ansicht1_min.avi" it shows an arm coming off the hub. I'm not sure what the purpose of this is. That design also has sealed bearings on the axle. The 3.8x Sturmey-Archer hub that JR Drift Trikes commissioned (and I've pre-ordered) has the fork connecting to it similar to that little arm.
waaalrus is offline   Reply With Quote
Old 2014-04-28, 03:53 PM   #7
TITANFLEX
Unicyclist
 
Join Date: Apr 2014
Location: Santee, California
Age: 67
Posts: 3
Hey Waaalrus, thanks for the link to these animated illustrations. UniFrank did some pioneering work here. We're looking to advance this art beyond Schlumpf's 2-speed hub and apply it to the larger bi-cycle market.

Cheers,
Tom
TITANFLEX is offline   Reply With Quote
Old 2014-04-28, 04:53 PM   #8
waaalrus
Unicyclist
 
Join Date: Oct 2009
Posts: 1,110
Quote:
Originally Posted by TITANFLEX View Post
Hey Waaalrus, thanks for the link to these animated illustrations. UniFrank did some pioneering work here. We're looking to advance this art beyond Schlumpf's 2-speed hub and apply it to the larger bi-cycle market.

Cheers,
Tom
Cool. This sounds pretty much like the inverse of what I proposed in this thread (You: take a unicycle wheel design and lay it down to make a bike, Me: take a bike design and stand it up to make a unicycle). Let me know if you need someone to stress test it by riding the wheel like a unicycle (with full body weight on it) or to demonstrate a wheelie. I would definitely be in the market for such a hub as long as it freewheels.
waaalrus is offline   Reply With Quote
Old 2014-04-28, 05:51 PM   #9
saskatchewanian
ERIC P
 
saskatchewanian's Avatar
 
Join Date: Jan 2007
Location: La Ronge, Saskatchewan, Canada
Age: 34
Posts: 6,472
It would probably be worth it to contact Greg Harper as well. He is harper on the forums. He is usually full of good ideas.
__________________
My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world. - Jack Layton
saskatchewanian is offline   Reply With Quote
Old 2014-04-29, 01:08 PM   #10
wobbling bear
GranPa goes-a-wobblin'
 
wobbling bear's Avatar
 
Join Date: Mar 2003
Location: European Union (S-W)
Age: 71
Posts: 2,504
you can also contact "bouin-bouin" on this forum: he has a design for a 2 speeds hub.
__________________
One Wheel : bear necessity
(Abuello RodoMancat)
wobbling bear is offline   Reply With Quote
Reply

Tags
geared, geared hub, hub, machinist, prototype


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[For Sale: USA] Schlumpf Geared Hub MJS Trading Post 3 2013-12-24 08:26 PM
another geared hub thread jtrops General Unicycling Discussions 18 2013-07-07 12:13 AM
Internal Geared Hub one4all General Unicycling Discussions 23 2013-01-11 02:01 AM
What do unicyclists want from a geared hub? onewheeldave General Unicycling Discussions 88 2012-10-19 10:44 PM
Any interest in a geared hub? asthian Trading Post 3 2012-02-28 06:03 PM


All times are GMT. The time now is 04:13 PM.


Powered by vBulletin®
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright © 2001-2019 Gilby
Page generated in 0.10258 seconds with 12 queries