Maxim's jumbo creation didn't last long however, it jumped the test track and suffered extensive damage. ... With the advancements and refinements made by early inventors, engineers could use those test results to design propellers with better performance and structural reliability. ... Geoffrey deHavilland, an English engineer, tested propellers whose aluminum blades could be adjusted to change their angle. ... Turnbull tested and confirmed that the large, slow-speed propellers produced higher thrust efficiencies than those compared with smaller, high-spe...

• Word Count: 1526
• Approx Pages: 6
• Grade Level: High School