WW2 German Luftwaffe Parallel-Getriebe – DUAL TACHOMETER DRIVE – Me109 Ar96 Fw44

The Fl. 20244 Parallel-Getriebe für Drehzahlmesser, Gerät-Nr. 127-1312 A, was a 1:1 mechanical distribution gearbox manufactured by Bruhn-Werke of Berlin and documented around 1943. It was intended for single-engine, two-seat aircraft equipped with two separate tachometers, including training aircraft and other dual-control or separated-crew-position aircraft where both occupants required their own engine RPM indication. Rotation from the engine was transmitted mechanically into the gearbox and divided between two flexible output shafts, allowing both tachometers to display the same engine speed simultaneously. Luftwaffe mechanical tachometers were connected by standardized flexible drive shafts, or biegsame Wellen, which transmitted rotational movement directly from the engine to the cockpit instrument. The same general type of flexible shaft was also employed with propeller-position indicators, connecting the propeller adjustment mechanism to its cockpit position indicator.

Made of aluminum and steel, this Parallel-Getriebe and Flexible-Drive Assembly Cable are in VERY GOOD used condition! The central distributor gearbox and mounting structure are aluminum, while both flexible armored drive shafts and associated fittings are steel. The assembly is 100% ORIGINAL wartime manufacture and remains exceptionally complete, including BOTH original flexible shafts and their original end fittings. Mechanically the unit remains fully functional: the input turns freely and correctly transmits rotation through the gearbox to BOTH output drives as designed. The mechanism still retains traces of its original grease, along with accumulated dirt, oil staining, and residue consistent with having been installed and operated in an aircraft engine installation. Traces of the original painted finish remain on the gearbox and mounting structure. There are NO cracks, breaks, seized components, or repairs. The circular mounting flange does show some minor dents and distortion from use or removal, however this could be readily straightened and corrected if desired. The flexible shafts remain intact and usable, with their armored coverings and fittings still present. The assembly would benefit from careful cleaning but has deliberately been left in its original as-found condition. An EXTREMELY RARE and mechanically complete Luftwaffe instrument-drive assembly, and an outstanding component for an advanced German aircraft restoration, trainer cockpit, instrument display, or aviation collection!