In addition to helicopter maintenance and modification, Hillberg Helicopters offers the RotorMouse EH 1-01 as a single-seat turbine experimental-category helicopter for construction from a kit (first flown August 1993), RotorMouse EH 1-02 tandem two-seat version, and RotorMouse (Baby Huey) four-seater. Also built the T-4 Turbine as a four-seat turbine helicopter (not in production at time of writing), and produces a retrofit kit for the RotorWay Exec to provide a turbine engine (first flown 1997).

D.Mondey "The New Illustrated Encyclopedia of Aircraft", 2000

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