1 1930 â 1939 World History - 1930 â 1939 World History Amelia Earhart (1897â1937) The Library of Congress Picture 2  ... RFC: meaning and definitions-RFC: Definition and Pronunciation. 3  Agencies of the United Nations-Agencies of the United Nations Linked to the United Nations through special agreements, the ...
1 Wood was used on most early airplanes and is now mainly used on homebuilt airplanes. 2  Wood is lightweight and strong, but it also splinters and requires a lot of maintenance. 3  Aluminum (blended with small quantities of other metals) is used on most types of aircraft because it is lightweight and strong.
Titanium is not a precious metal when you compare it to silver or gold, but if someone is shooting at you and you have a wall to stand behind that is made of Titanium is would be considered the most valuable item in your life. Titanium is light weight, very strong and is able to be made into different shapes. The cockpit of the US Air Force's A-10 (Warthog) is made of Titanium which will protect the Pilot and Co-Pilot/Navigator safe from being shot. I guess it all comes down to what you consider 'valuable'.