Kent, Washington Patent of the Year – 2024/2025
Pacific Propeller International LLC has been awarded the 2024/2025 Patent of the Year for a rapid propeller-refurbishment process. Their invention, detailed in U.S. Patent No. 11873118, titled ‘System and method for improved cycle time milling and inspection’, pairs custom tooling with smart probing to restore taper bores in Hamilton Sundstrand blades in record time.
The system locks each blade in a purpose-built horizontal mill, runs an automated probe cycle to align coordinates, then skim-cuts the butt face and reams away shot-peened surfaces in one setup.
Integrated air-gauges verify dimensions on the spot. The blade exits for nondestructive eddy-current and fluorescent checks, returns for final shot peen, and receives a finish ream without leaving the fixture.
This closed-loop flow boosts repeatability, trims labor, and reduces the chance of handling damage. Pacific Propeller reports cycle times cut by up to 40 percent, keeping transport aircraft in service and lowering overhaul costs for operators worldwide.
Inventors Craig Teerlink and John Nava designed custom reamers, alignment pins, and an immersion-free fluorescent penetrant fixture that speeds inspection while meeting strict military standards. Their work shows how targeted engineering can revive legacy hardware and enhance flight safety.