The creation of the propeller can be traced back to Leonardo da Vinci. Da Vinci's "helical screw" helicopter is believed to be the ancestor of the air propeller and the helicopter rotor. The first idea of a propulsive airscrew, however, belongs to J.P. Paucton, a French mathematician. Paucton envisioned a flying machine that had two airscrews, one for propulsion and the other for sustaining flight. The idea of using an airscrew for propulsion was utilized during the late 1700's to early 1800's. Only after experimentation did the inventors conclude that more propulsive power could be obtained by merely straightening out the surface of the airscrew blades. Attempts to utilize the "straight blade" propeller were made by balloonists. These contraptions were quite strange and hardly fulfilled their purpose of actually propelling

Two major breakthroughs occurred after the war: the once piece metal propeller, and the ground adjustable pitch propeller. The metal propeller allowed operations in all climates, whereas the wooden prop would fail in extreme conditions. The metal propeller could be made thinner than a comparable wooden propeller, which allowed for faster cruising speeds due to less drag from compressibility. Thinner blades also improved efficiency at higher speeds. The only drawbacks to the early metal propeller were their weight and fixed pitch blade angles. The development of the ground adjustable propeller was a major improvement. The best propeller of this kind at the time was the dural-blade ground adjustable propeller. With this adjustable propeller, the pilot could choose whether or not they wanted to have great takeoff performance or great cruise performance. In 1927, the idea of changing the pitch of a propeller was taken one step further with the development of the in-flight adjustable propeller. This gearshift device allowed pilots to change the pitch angle in flight to get the best performance out of their aircraft during takeoffs and during cruise.

With the advancements and refinements made by early inventors, engineers could use those test results to design propellers with better performance and structural reliability. These advancements led to the development of the first generation of well-designed propellers. One of the first designs was the "Integrale", developed by Lucien Chauviere, the world's first industry standard propeller manufacturer. By 1910, the number of propeller producers multiplied, and numerous advancements were made. While most of the manufacturers were focusing on wooden propellers, a few visionaries were experimenting with metal propellers and variable pitch blades. Geoffrey deHavilland, an English engineer, tested propellers whose aluminum blades could be adjusted to change their angle. At the same time, German pioneers Hugo Junkers and Hans Reissner experimented with lightweight metal propellers. The first U.S. propeller production facility was the Requa Gibson Company founded in 1909, which was headed by Canadian engineer Wallace R. Turnbull. Turnbull tested and confirmed that the large, slow-speed propellers produced higher thrust efficiencies than those compared with smaller, high-speed propellers. More importantly, Turnbull c

Some common words found in the essay are:
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Approximate Word count = 1606
Approximate Pages = 6 (250 words per page double spaced)