Hartzell Propeller has received an FAA STC for its new three-bladed Polaris composite propeller as an upgrade option for diesel-powered Diamond DA40 NG aircraft. The Polaris propeller replaces the ...

Diesel engines are a rarity in aviation history, but they've carved out an interesting niche. While most aircraft rely on gasoline-powered piston engines or jet turbines, diesel has offered some ...

At the beginning of the 20th century, the automotive world was still in its early years, and car designers and engineers were overflowing with ideas. Moreover, engineers of that era often took ...

Boats are propelled forward by various power sources, such as human power, wind power, and internal combustion engines. Nowadays, even electric boats are coming onto the scene. Propulsion for ...