Rayden wrote:
> *cyberbellum, you said the parallelogram would jam, but I
> am assuming that it would be built well enough so that
> instead of jamming it would transmit the force. Seems like
> it would work to me... *
The middle diagram in your last sketch shows the upper
telescopic leg bent, with the interior part jammed in the
exterior part. Hence my assumption.
The middle diagram also shows the left end and the right end
out of parallel. Since this is the effect you are trying to
achieve it seems that the design isn't all that effective.
The short version is that, even though from a pure math
perspective it seems promising, from an engineering
perspective it would be impossible to make parts stiff
enough to do what you want. The problem is with the basic
geometry of the solution. Even a mechanism built like an
engine block would allow some angular play in the rim
element. I could go on and explain why, but that would
require a page or two of math and solid mechanics and I
don't have that kind of time or energy.
The midday heat is over here in DC so I'm about to follow
gerblefranklin's advice and go out for a ride. Yesterday I
went a couple of miles on my 29"er with only one UPD (if you
don't count the dozen or so UPDs just trying to get
started). Today I think I'll work on my freemount with the
20" unicycle. I still haven't managed better than a 10%
success rate. I know I can do it - the 20" is such a toy -
but I've got some sort of mental block going.
--
cyberbellum - Level 1.0 rider!
Optimists think the glass is half full. Pesimists think the glass is
half empty. Engineers think the glass is too big.
------------------------------------------------------------------------
cyberbellum's Profile:
http://www.unicyclist.com/profile/4550
View this thread:
http://www.unicyclist.com/thread/32510