 This emerged as the Hiller VXT-8 which was significantly similar to the SNECMA design, although it used a propeller instead of a jet engine.However, the introduction of turbine-powered helicopters like the Bell UH-1 Iroquois so significantly improved their performance over piston-powered designs that the Navy lost interest in the VXT-8 in spite of even better estimated performance.Only a mock-up was completed.