747400sp From United States of America, joined Aug 2003, 4218 posts, RR: 2 Posted (11 years 4 months 1 week 5 days 6 hours ago) and read 6351 times:
I when a 747 take off or is in flight there wings bend to support there weight, even 747 100 wing do this. Seeing that the dash 100 was built in the late 60's early 70's and metal is not really fixible, it make me think the 747 100 was the first airliner to use composite which they on the wing. I may be wrong do any body else agree.
Starlionblue From Greenland, joined Feb 2004, 17626 posts, RR: 65
Reply 1, posted (11 years 4 months 1 week 5 days ago) and read 6253 times:
No I don't agree. Metal can be very flexible. Just take a fish filleting knife. Bends nicely without breaking no? While composites have been in use for a long time, the wing structure on the 741 is made of metal alloys.
"There are no stupid questions, but there are a lot of inquisitive idiots."
2H4 From United States of America, joined Oct 2004, 8957 posts, RR: 56
Reply 7, posted (11 years 4 months 1 week 4 days 13 hours ago) and read 5973 times:
Composite material is less flexible than metal. Not more so.
Generalizations should never, ever, ever be made about composites. Given the countless possible variations in fiber orientation and layup, not to mention the prepreg variables and differing construction methods, the above statement is absolutely, 100% impossible to prove or disprove.
Composites can be stiffer than metal. They can be more flexible than metal. They can be stiffer in one direction than metal. They can be more flexible torsionally than metal. You get my drift.
Saying composite material acts in a certain way relative to another material is kind of like saying oil paints are greener than watercolors. You can make oil paint as green as you'd like by altering the pigment, etc.
P.S. - This is in no way intended to knock our esteemed Gigneil. I just see this sort of statement frequently and want to clear things up a bit.