Ivoprop Corporation, founded in 1984 by Ivo Zdarsky, is an American manufacturer of composite propellers for homebuilt and ultralight aircraft, as well as airboats.

[1][2] Zdarsky started the company after carving his own propeller for a homebuilt ultralight trike that he flew from Cold War Czechoslovakia, over the Iron Curtain to Vienna in 1984.

[1][2] The company's propellers are built from carbon-fiber-reinforced polymer and feature a stainless steel leading edge.

[1][2] Ivoprop produce both in-flight adjustable and ground-adjustable propellers of unusual design.

By mechanically turning the rod within the hub, a twist is achieved which adjusts the blade's angle of attack.