High Speed Hubs

Will-

English must be your second language but you are quite good. This forum
has a search function that will lead you to all kinds of geared
unicycle info. The internally geared hubs used so far have gear ratios
of 1:1.5 to 1:1.6. The wheel size of your tricycle will determine your
maximum speed as well as the gearing you use. Search for "epicyclic
hub," "planetary hub," "geared unicycle," uni.5, BlueShift, Florian
Schlumpf, Frank Bonsch and you will find lots of internally geared
information pertaining to unicycles.

A more flexible design with higher gear ratios for your particular
project might be Pete Perron's jackshaft design. He has produced a
1:1.89 ratio with this design but it is fixed while riding. He has it
set up now to change the ratio without too much difficulty in your
workshop at home, Search for "Purple Phaze," "Outa Phaze," and Pete
Perron to find info on this gearing scheme.

--
harper

-Greg Harper

B L U E S H I F T

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harper said:

This forum has a search function that will lead you to all kinds of
geared unicycle info. The internally geared hubs used so far have gear
ratios of 1:1.5 to 1:1.6. The wheel size of your tricycle will
determine your maximum speed as well as the gearing you use. Search for
"epicyclic hub," "planetary hub," "geared unicycle," uni.5, BlueShift,
Florian Schlumpf, Frank Bonsch and you will find lots of internally
geared information pertaining to unicycles.

I don't know why people bother referring newbies to the search
function; it's all but worthless. Try a search for "epicyclic hub"
(which should be very specific), and there isn't a single useful
subject line that comes up in the top 10. The only subject on the
first page which seems useful at all is "The KH prototype geared MUni.
(from moab)", which sounds promising but contains no information which
would actually help this person.

So to actually answer the question:

There is one geared unicycle hub in common production, manufactured by
Florian Sclumpf. It would probably be fairly simple to adapt it to a
front-wheel-driven tricycle, although I'm not sure Sclumpf is selling
the hub separately at this point. You could try 'contacting him'
(http://schlumpfdrive.com/?schlumpfdrive:contact:contact_us):

--
tholub
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tholub said:

I don't know why people bother referring newbies to the search function;
it's all but worthless.

Tom-

I think this a design project for a university course. He's looking
around for ideas, not to buy an existing product. That's my take on it,
anyway. The single words "epicyclic" and "planetary" should pop
something up. The phrases could be used in Yahoo or Google but I
failed to mention that. I was a bit lazy to search out the many, many
threads on the topic. He could go to my website and get the full prints
for a geared unicycle hub design but I think he's going to develop his
own.

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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harper said:

Tom-

I think this a design project for a university course. He's looking
around for ideas, not to buy an existing product. That's my take on it,
anyway. The single words "epicyclic" and "planetary" should pop
something up. The phrases could be used in Yahoo or Google but I
failed to mention that. I was a bit lazy to search out the many, many
threads on the topic. He could go to my website and get the full prints
for a geared unicycle hub design but I think he's going to develop his
own.

I just don't see the value in saying "use the search function"; the
forum search function never provides useful results. And in any case,
while there are many threads which discuss geared hubs, there is
probably not a thread which discusses in detail the comparitive
engineering of the various models available, and certainly no thread
which discusses their applicability to a tricycle design.

How about this for a new forum rule: anyone who clutters up the forum
with "use the search function" posts must actually use the search
function first to see if it turns up anything useful.

--
tholub
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tholub said:

How about this for a new forum rule: anyone who clutters up the forum
with "use the search function" posts must actually use the search
function first to see if it turns up anything useful.

Good rule of thumb, not as a "rule" but as a test instead. Good
suggestion.

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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one question: why do you need to drive the front wheel? seems in
efficient, and possibly a bad idea. why not just drive the rear wheels
or reverse the thing and drive a single rear wheel? check out
catrike.com for a good example of what i'm talking about. not saying it
can't/won't work to drive the front wheel, but i'm saying it might be
needlessly complicated.

--
markf

stuck in iowa and gainfully employed.
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G'day everyone and thanks for replying.

My main question was, are there any direct driven gears (or hub gears
like those used on a schlumpf unicycle, although one that rides faster
not slower) out on the market by themselves i.e. I am not talking about
finding a whole unicycle with the geared hub, only the geared hub
itself. Are they available? I may want to incorperate it into my
design. Speed is not much of a requirement for a shopping bike, but
going at a geared speed of 1:1 is too slow.
By the way the university course I am doing is Industrial Design where
we design things to be manufactured - like a unicycle! So to be more
specific, I am after a directly driven geared hug that is manufactured
and is on the market and you can purchase it seperately. I am not
looking for one that is knocked up in the garage, but even so let me
know if someone has recently created one like this.

Also, should I be looking for something like a 2:1 or a 1:2 geared hub
if I am after more speed?

You have all been a good help, if you have any questions let me know
Thanks
Will

--
willp
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willp said:

I am not looking for one that is knocked up in the garage, but even so
let me know if someone has recently created one like this.

If you can get hold of VeloVision issue 12, you may find it helpful.
Issue 13 may also be of some use:
http://tinyurl.com/msrja
http://tinyurl.com/jb426

Issue 12 had an article about the use of direct drive hubs for
recumbents. Issue 13 covered unicycles.

--
Danny Colyer

http://www.colyer.plus.com/danny/
Subscribe to PlusNet http://www.colyer.plus.com/referral/
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1:2 means that for every 1 turn of the pedals you get 2 of the wheels,
so this is gearing up and will allow you to go faster. Talk to florian
sclumpf, as this is a one-off he may sell you just the hub, to be
honest you don't really have any other options, he is the only mass
producer of epicyclic unicycle hubs.

--
kington99

Dave

- what a thoroughly post-modern subversion of the cycling genre -
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In view of the fact that an idea search is part of the project; have a
look at Dynamic Bicycle shaft drive bicycle. They have a shaft drive
from the crank to 7 or 8 speed rear hub. I have the eight speed
"Switchback" MTB and have been pleased with it, though i live in a flat
area with no "mountains ".
A shaft drive trycycle or two wheel up-front trycycle as is so
common in Mexico with vendors might be interesting.

--
tumblebug rollin
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tholub said:

I don't know why people bother referring newbies to the search function;
it's all but worthless. Try a search for "epicyclic hub" (which should
be very specific), and there isn't a single useful subject line that
comes up in the top 10.

You need to change the order in which the results come up, from by
date, to by relevancy.
That brings up lots and lots.

--
James_Potter

i still believe that all you need is love...john
lennon
'*mikael atkinson*' (http://www.barefoothippie.com)
jonny peacock is my main man.
mdotedotatkinsonatgmaildotcom
*President of the 'MRIS' (http://tinyurl.com/dk2de)*
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The schlumpf hub is the only hub being manufactured that I think will
meet your needs. Contact Florian, he may sell you just the hub if he
knows it's not going into a unicycle. Expect it to be expensive.

The schlumpf hub is shiftable between 1:1 and 1:1.54

willp said:

G'day everyone and thanks for replying.

My main question was, are there any direct driven gears (or hub gears
like those used on a schlumpf unicycle, although one that rides faster
not slower) out on the market by themselves i.e. I am not talking about
finding a whole unicycle with the geared hub, only the geared hub
itself. Are they available? I may want to incorperate it into my
design. Speed is not much of a requirement for a shopping bike, but
going at a geared speed of 1:1 is too slow.
By the way the university course I am doing is Industrial Design where
we design things to be manufactured - like a unicycle! So to be more
specific, I am after a directly driven geared hug that is manufactured
and is on the market and you can purchase it seperately. I am not
looking for one that is knocked up in the garage, but even so let me
know if someone has recently created one like this.

Also, should I be looking for something like a 2:1 or a 1:2 geared hub
if I am after more speed?

You have all been a good help, if you have any questions let me know
Thanks
Will

--
mscalisi
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