Re: Triton Sponge frames... titanium trials.


This is totally off-topic, but...

Yes, aluminum oxidizes, but it does not burn. Aluminum forms a very
strong, well sealed oxide coating which inhibits the surface breakups
that allow flames to form. When wood burns, tiny bits of wood dust are
blown off the surface of the wood, and burn in the air, which is what
you see when you see flames. Fire retardants work by creating strong
polymers that prevent the material from releasing bits of itself into
the air to form flames. Aluminum's oxide coating acts as a fire
retardant. If you want to hear about flames and aluminum though, google
"thermite reactions". All of this is from my highschool chem class, 2
years ago, so please, correct me if I'm wrong.

Are you sure that damaged airplane wasn't magnesium? Many American WWII
aircraft used magnesium airfame components. I've heard stories of
burning aircraft crash landing on carriers. As soon as they got the
pilot out, they'd literally push the craft off the deck to clear for
other craft to land. The magnesium burns so hot that supposedly the
airframe would separate seawater into hydrogen and oxygen, the fueling
the burning airframe until the murkiness of the sea obscured it.

Back to the titanium frame, I'm curious about the order of fabrication
on the bearing holders... Did you machine the bearing seat first, and
then weld on the screw tabs, or did you weld, then machine. I would
have done the latter, but I'm curious as to how the pros do it.

Also, another note that supports you threading the bottom caps and
running the screws from the top: During bad pedalgrabs, the screw heads
will be damaged and mushroomed, which will make it hard to fit an allen
wrench in. By putting the screws in from the top, you prevent this.


--
gerblefranklin

(Shut up and ride)

http://gallery.unicyclist.com/Trials-Muni
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