Re: Museeuw Flax Bicycle Frame Damping Characteristics

On 23 Aug, 10:29, Ben C <spams...@xxxxxxxxx> wrote:
On 2009-08-23, Chalo <chalo.col...@xxxxxxxxx> wrote:



Ben C wrote:

Jobst Brandt wrote:

The article takes a long time to get to the subject, but then uses
classic similes and allusions to desirable characteristics, a few of
which directly conflict, like "rigid but vibration absorbent".

There's no conflict there-- "vibration absorbency" refers to damping not
to stiffness.

Try hitting a cricket ball with a cricket bat and then with a frying
pan. The bat is stiffer but better damped.

This new bike is meant to be more like a cricket bat than a frying pan..

It's actually more like a wooden bat versus a metal bat.  In baseball,
metal bats actually work very well and would be indispensable in
professional leagues if they were permitted.

Right, although I'm not sure which is stiffer: the wooden or metal bat.

But does this difference even matter if there is an airbag between the
ball and whatever you're hitting it with?

I don't know. Would have to ride the bike. I was just pointing out that
rigid but better damped does at least make sense in principle.

Does it matter if one bat or the other breaks and injures you in the
process?

Of course, but there's no reason to think this flax bike is weaker
than a regular CF one.

The flax fibres probably aren't as strong, but they maybe use more of
them or something, or have as much CF in there too as they would anyway.

Flax fibre will likely improve the failure mode of a composite frame
so is does not splinter when overstressed. I dont think carbon fibre
frames should be constructed with only one fibre length. There should
be a combination of fibre length so as to avoid fragmentation into
shards upon fracture. I think for the possible safety benefits, a
flax/carbon mix will be more popular with professionals. Weights of
frames are low enough that encasement of a carbon frame is viable.
.

Relevant Pages

  • Re: Museeuw Flax Bicycle Frame Damping Characteristics
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    (rec.bicycles.tech)
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