Aussie bike

http://i14.photobucket.com/albums/a3...DSC02435aa.jpg

Wow. Just... wow.

Guy
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On Fri, 13 Feb 2009 07:39:09 +0000, "Just zis Guy, you know?"
wrote:

http://i14.photobucket.com/albums/a3...DSC02435aa.jpg

Wow. Just... wow.

Guy


You are mental - no more - no less.

Just zis Guy, you know? wrote:
http://i14.photobucket.com/albums/a3...DSC02435aa.jpg

At last we have proof that steel is the best frame material!

Rob

On Fri, 13 Feb 2009 13:14:28 +0000
Rob Johnstone wrote:

Just zis Guy, you know? wrote:
http://i14.photobucket.com/albums/a3...DSC02435aa.jpg

At last we have proof that steel is the best frame material!

I imagine a brazed frame would end up as a DIY kit, and lightweight
heat treated tubing might be a bit too soft for reuse. At least
there'll be some remnants of an alloy frame to produce for insurance
purposes, unlike carbon ...

On Fri, 13 Feb 2009 13:14:28 +0000, Rob Johnstone
wrote:

Just zis Guy, you know? wrote:
http://i14.photobucket.com/albums/a3...DSC02435aa.jpg

At last we have proof that steel is the best frame material!

I have always thought of forest fires as being low heat fires. I
guess I was wrong. What are the melting points of steel and
aluminium? The fire must have been buring at something in between.

On Fri, 13 Feb 2009, Rob Morley wrote:

I imagine a brazed frame would end up as a DIY kit, and lightweight
heat treated tubing might be a bit too soft for reuse. At least
there'll be some remnants of an alloy frame to produce for insurance
purposes, unlike carbon ...

You're suggesting the fire exceeded 3000C by a sizeable margin for a
significant time in order to break down the fibres? I find it strange
that the chain and sprockets survived in recognisable shape if that's
the case.

[I don't actually know how hot you need to go, but you get to about
3000C in the final manufacturing stage as you carbonize the fibres, so
it's probably in excess of that to break them down).

regards, Ian SMith
--
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|o o|
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On Fri, 13 Feb, Tom Crispin wrote:
On Fri, 13 Feb 2009 13:14:28 +0000, Rob Johnstone
wrote:

Just zis Guy, you know? wrote:
http://i14.photobucket.com/albums/a3...DSC02435aa.jpg

At last we have proof that steel is the best frame material!

I have always thought of forest fires as being low heat fires. I
guess I was wrong. What are the melting points of steel and
aluminium? The fire must have been buring at something in between.

Steel about 1400 - 1500C, aluminium about 600C.

If you google 'aluminium and fire' you can find a semi-technical paper
from the aluminium federation which includes some comments on aluminium
in a forest-fire situation. There's a photo of a car sitting on the
road, with little streams of aluminium trickling away from where the
alloy wheels used to be.

regards, Ian SMith
--
|\ /| no .sig
|o o|
|/ \|

On 13 Feb 2009 13:45:01 GMT
Ian Smith wrote:

On Fri, 13 Feb 2009, Rob Morley wrote:

I imagine a brazed frame would end up as a DIY kit, and lightweight
heat treated tubing might be a bit too soft for reuse. At least
there'll be some remnants of an alloy frame to produce for
insurance purposes, unlike carbon ...

You're suggesting the fire exceeded 3000C by a sizeable margin for a
significant time in order to break down the fibres? I find it
strange that the chain and sprockets survived in recognisable shape
if that's the case.

[I don't actually know how hot you need to go, but you get to about
3000C in the final manufacturing stage as you carbonize the fibres,
so it's probably in excess of that to break them down).

But that's done in the absence of oxygen. AIUI high temperature carbon
composites like ceramic braking components rely on the matrix material
to provide their heat resistance, while with a carbon-epoxy composite as
used for bike frames the resin will burn off from around 400C and the
carbon will start to burn around 600C, a temperature typical of forest
fires.

On Feb 13, 2:42*am, Rob Morley wrote:
On 13 Feb 2009 13:45:01 GMT





Ian Smith wrote:
On Fri, 13 Feb 2009, Rob Morley wrote:

*I imagine a brazed frame would end up as a DIY kit, and lightweight
*heat treated tubing might be a bit too soft for reuse. *At least
*there'll be some remnants of an alloy frame to produce for
insurance purposes, unlike carbon ...

You're suggesting the fire exceeded 3000C by a sizeable margin for a
significant time in order to break down the fibres? *I find it
strange that the chain and sprockets survived in recognisable shape
if that's the case.

[I don't actually know how hot you need to go, but you get to about
3000C in the final manufacturing stage as you carbonize the fibres,
so it's probably in excess of that to break them down).

But that's done in the absence of oxygen. *AIUI high temperature carbon
composites like ceramic braking components rely on the matrix material
to provide their heat resistance, while with a carbon-epoxy composite as
used for bike frames the resin will burn off from around 400C and the
carbon will start to burn around 600C, a temperature typical of forest
fires.- Hide quoted text -

- Show quoted text -

Sorry, what are the cogs made of if they survived but the frame
melted?

It's a curiously disturbing picture.

"spindrift" wrote in message
...
On Feb 13, 2:42 am, Rob Morley wrote:

Sorry, what are the cogs made of if they survived but the frame
melted?

Steel cogs, probably Al frame.