What if I used the half link to get a chain where the number of links equals a prime number? On my Reynolds 531, lugged and fillet brazed Bob Jackson? DB Ak, NZ
Mark Petry wrote:
>David - BZZT! Empirical results obtained on a schwinn town and country
>are completely irrelevant! No data will be accepted unless the
>experimental testbed is an all 531 or Columbus tubed frame of fillet
>brazed or lugged construction!
>
>As for your measurements of the boob toob, the radius of the eccentric
>will more than compensate for any irregularities in chain length. The
>prime number hypothesis stands until disproved with REAL data! And none
>of this half link stuff (altho I must admit I stopped for a moment to
>consider the implications of this un-anticipated development.
>
>WHO has read the masterpiece / tour de force "Cryptonomicon" by Neal
>Stevenson ? In that book, there is a description of a great piece of
>empirical mathematics performed by the polymath Allan Turing, inventor
>of the stored program computer, while on a bike ride in southern England
>in 1942. His chain has a sticky link, and his chainwheel, a bent tooth.
>Every so many fractions of a mile, the chain pops off! He does, in his
>head, during the ride, he does the calculus about the frequency of a
>sticky chain link, hitting a tooth on the rear cog, blah blah blah. How
>appropos the present discussion!
>
>Worth hunting for if you are so inclined.
>
>Anyway!
>
>=====================================================
> Mark Petry 206.618.9642
> Beautiful Bainbridge Island, WA
> mpetry@bainbridgeisland.net
>
>=====================================================
> "Fighting a preemptive war is as irrational as
> committing suicide because one fears death."
>
> --Otto von Bismarck
>=====================================================
>
>
>-----Original Message-----
>From: David Benson [mailto:david@worrall.co.nz]
>Sent: Tuesday, April 08, 2003 5:57 PM
>To: HM & SS Sachs
>Cc: mpetry@bainbridgeisland.net; Classicrendezvous@bikelist.org
>Subject: Re: [CR]the odds on tandem transfer cog tooth count
>
>
>HM & SS Sachs wrote:
>
>>Whoa! Mark, I'm going to take the bait. In a series of miserable,
>>unplanned, empirical experiments involving an on-topic Schwinn
>>Town-and-Country and transfer cogs ordered from R.E.W. Reynolds in
>>England, I was forced to confront the fact that tandem eccentric
>>bottom brackets can only take up a limited amount of chain. The exact
>>
>
>>length of the "boob tube" (bottom bracket connector tube) on that bike
>>
>
>>was such that it absolutely required even numbers of teeth on the
>>transfer cogs. With a slightly shorter boob tube, I suspect that only
>>
>
>>odd tooth numbers would work. Evens worked fine on the T&C, and
>>allowed use of the eccentric to take up slack as the chain wore. Odd
>>tooth rings could only be set up as too-loose, or
>>
>won't-stretch-to-fit.
>
>So DB asks:
>
>Harvey,
>Did you try putting a half link in the chain?
>
>DB
>Auckland, NZ