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.
Propellers are inclined planes that transmits power by converting rotational motion into thrust. Two of the other six simple machines are based on the inclined plane. The wedge is a compound portable inclined plane. It is made of two inclined planes that meet at an edge. The screw is an inclined plane wrapped around a cylinder.