Private Pilot Flight Training and Instruction Flight Training Article Library | Back To 4VFR.COM Trim Tab Inventor Also known at the servo trim was invented by Anton Flettner, a German aeronautical engineer. He worked for the Zeppelin Company in Germany. (Will try to find out if his invention installed on Zeppelin before airplanes.) Came to U. S after WWII and worked for Navy. Died 1962. First gyroscopic instruments were test flown on blimps. First reversible propellers were installed on airships. Written by Gene Whitt Flight Training Article Library | Back To 4VFR.COM