(From Sport Aviation, 12/1998, Page 132) Advertisement for Hoffmann propellers from Sport Aviation, December 1998.

(From Sport Aviation, 06/1998, Page 141) Steen Aero Lab classified ads from Sport Aviation, June 1998.

(From Kitplanes, 06/1994) Starfire Aviation (Mac McKenzie / Firebolt) ad from Kitplanes, June 1994.

(From Sport Aviation, 05/1990, Page 81) Steen Aero Lab ad from Sport Aviation, May 1990.

(From Sport Flying, 08/1979) Steen Aero Lab ad in Sport Flying, August 1979.

(From Private Pilot, 08/1973) Private Pilot Advertisement, August 1973.