Proper blade assembly is crucial for aircraft propellers, ensuring durability, efficiency, and safety by reducing vibrations, preventing fatigue failures, and enhancing aerodynamics. High-quality materials and precise engineering improve performance, minimize erosion, and extend lifespan.
The Hoffmann composite blade is a joint construction. The blade root is made of highly compressed hardwood and the blade part is made of lightwood (spruce). Special lag screws connect the compressed wood of the blade with a metal ferrule. An metal or PU strip protects the leading edge against erosion.
To increase torsional stiffness the blade is covered with fibre reinforced epoxy (FRP). Fatigue failures due to vibrations are unlikely because the internal damping of wood is considerably higher than that of duraluminum.
Hoffmann Propeller is a certified Part 21 design and production organization, ensuring the highest standards in safety, quality, and innovation. Our EASA-approved processes guarantee reliable solutions from concept to completion — trusted worldwide for certified aviation excellence.
Several layers of polyurethane lacquer are sprayed onto the fibre reinforced epoxy covering which assure high resistance against moisture, erosion and other mechanical effects without loss of necessary elasticity. Additionally, the lacquer protects against UV-rays. The thrust side is painted black to avoid reflections of sunlight.
For safety reasons the tips are painted with a different colour to make the transparent disc visible when the propeller is running.