Re: CFRP drawbacks

I agree that there's not much there concerning lifespan of the adhesive,
other than a fair amount of detailed study showing what's been done to
prove its worthiness for aircraft. By inference one can assume they don't
see that as an issue, since it's not brought up, but hard data would be
nice. The particular adhesive (hysol 9430) *is* referenced as the
material to be used in applications where vibration is very high. It
seems unlikely that something used in rotors on hydrofoils, where failure
could be deadly, hasn't past rather rigorous tests. Keep in mind that at
least two of the references I listed were 3rd party analysis of how to
safely build an aircraft using carbon fiber materials and adhesives,
*not* ads from Hysol (actually a division of Loctite these days)....

Keep in mind that most of these aircraft parts have a design lifespan,
after which they are discarded, regardless of what inspection would show
their condition to be. Do we want to be making expensive, disposable
bicycles?

Certainly not! But that "design lifespan" of an aircraft is pretty darned
impressive, at least since the infamous Lockheed Elektra crashes back in the
day. I'd be quite happy to own a bike that would suffer through as many
hours of use as a typical airframe before needing to be replaced.

So I guess I answered incorrectly. An expensive bicycle *is* disposable.
It's just hopefully not going to reach the limits of its lifespan during a
typical rider's life. Maybe not even that of his or her kids.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com


"Tom "Johnny Sunset" Sherman" <sunsetss0003@xxxxxxxxxxxx> wrote in message
news:470acaeb$0$26499$88260bb3@xxxxxxxxxxxxxxxxxxxx
Mike Jacoubowsky wrote:
...
I agree that there's not much there concerning lifespan of the adhesive,
other than a fair amount of detailed study showing what's been done to
prove its worthiness for aircraft. By inference one can assume they don't
see that as an issue, since it's not brought up, but hard data would be
nice. The particular adhesive (hysol 9430) *is* referenced as the
material to be used in applications where vibration is very high. It
seems unlikely that something used in rotors on hydrofoils, where failure
could be deadly, hasn't past rather rigorous tests. Keep in mind that at
least two of the references I listed were 3rd party analysis of how to
safely build an aircraft using carbon fiber materials and adhesives,
*not* ads from Hysol (actually a division of Loctite these days)....

Keep in mind that most of these aircraft parts have a design lifespan,
after which they are discarded, regardless of what inspection would show
their condition to be. Do we want to be making expensive, disposable
bicycles?

--
Tom Sherman - Holstein-Friesland Bovinia
A Real Cyclist [TM] keeps at least one bicycle in the bedroom.

--
Posted via a free Usenet account from http://www.teranews.com



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