double cranks

i've had a similar idea... but didn't think through it and the plan had
left my head

anyway, it looks like (from your picture) that it could be dangerous

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you would have to switch the pedals though right? unless you have weird
legs that could dodge a second set of pedals😉

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pk said:

*you would have to switch the pedals though right? unless you have
weird legs that could dodge a second set of pedals😉 *

i think that is why i dropped the idea in the first place :p

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you mean like
'[img=http://img85.exs.cx/img85/889/unipedal9xi.th.jpg]'
(http://tinyurl.com/5vss2)

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There would only be one set of pedals, how I understand it. The pedal
would be on one end, and the crank would attach to the hub either at the
center hole or the end hole.

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James_Potter said:

There would only be one set of pedals, how I understand it. The pedal
would be on one end, and the crank would attach to the hub either at
the center hole or the end hole.

This is perhaps an easier solution:

http://www.davincitandems.com/images/3hole2.jpg

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Here's something I cooked up in about 5 minutes:

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unisk8r's coker "purple phase" has not only double cranks but triple
cranks.

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JVTFm wrote: unisk8r's coker "purple phase" has not

Quoted message said:

only double cranks but triple cranks.

Oh yeah?

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| Attachment filename: holeinone.gif |
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IMO a good priced adjustable crank would be a great bit of kit to have,
giving the advantages of a geared uni without losing out on the
mechanical simplicity that is such a nice aspect of unicycles.

http://tinyurl.com/2plgy

Is a thread which started with my own idea for an adjustable crank
design and developed into a three page discussion with loads of great
ideas and some very nice contributions from showard showing computer
generated designs of the ideas (on page 2).

[image:
http://www.unicyclist.com/forums/attachment.php?s=&postid=187107]

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onewheeldave wrote: IMO a good priced adjustable

Quoted message said:

crank would be a great bit of kit to have, giving the advantages of a
geared uni without losing out on the mechanical simplicity that is
such a nice aspect of unicycles.

http://tinyurl.com/2plgy

Is a thread which started with my own idea for an adjustable crank
design and developed into a three page discussion with loads of great
ideas and some very nice contributions from showard showing computer
generated designs of the ideas (on page 2).

[image:
http://www.unicyclist.com/forums/attachment.php?s=&postid=187107]

Thanks for the pointer and the red eyes reading that huge thread gave
me. Very interesting thoughts and designs but taking all things in
consideration like design and manufacturing problems I think I'll start
out by trying the 'multiple pedal hole crank' alternative. I don't mind
if it takes a minute to unscrew and move the pedals. I too want to keep
the unicycle design simple. It's just that on days when I do more than
one type of riding I would appreciate the possibility to change from
road to trail gear with short notice. Perhaps I just buy me a set of
long cranks and take them to a shop where they can drill and thread a
couple of extra holes in them.

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Getting holes drilled and threaded wouldn't be that easy. It is
absolutely vital that the axis of the pedal spindle is perfectly
parallel to the axis of the hub. Even a tiny variation will affect your
riding comfort, and could conceivably cause injuries to your ankles.

I asked a friend who is an engineer to consider making me some custom
length cranks. he said he could do it, but he'd have to make a special
jig to hold it all perfectly in line.

Search the forum and you will find references to:
Multi-hole cranks
Telescopic (extending) cranks
Discs with multiple holes
Switchable gears.

The multi hole cranks and extending cranks are available commercially,
but are expensive.

Better to compromise and select one set of cranks suitable for the ride,
and to ride within the limits of the cranks you've chosen. The
simplicity is part of the charm of a unicycle. Also, my own experiments
have shown that short cranks make less difference than they ought to,
except in very specific conditions. Read Aspenmike's posts about 80
mile days on a Coker on 170s to see that short cranks are not the be all
and end all of fast distance riding.

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