Hi there! Today, I post my first Luftwaffe instrument related post: the instrument panel of the Bf 109 K-4 (Bf was used instead of Me in the original K-4 manual, therefore I use Bf). The information is from an old website of mine, but perhaps most of you have not seen it before. The topic is somewhat different from the photo postings and I am not sure if I should open a separate blog for instruments and aircraft parts related topics. I added a voting poll so that you can decide what you prefer in the future. Enjoy! Your LW collector.
The Blind Flying Panel Fl 22000-1, which carried delicate instruments like the air speed indicator, altimeter, etc. was attached to the Main Panel with four rubber shock mounts. The Main Instrument Panel was attached with hexagonal screws (M6x58, LgN14180.1) to the Geraetebretttraeger which itself was fixed to the windshield assembly.
The Geraetebrett carried not only the main instrument panel but also control instruments for the armament, a pressure gauge for the MW50 equipment (or the clock, respectively), and the Revi 16B gunsight mounting. Critical values on instruments were distinguished with red markings applied directly onto the front glass of the instrument or by means of adjustable markers inside the instruments.
(1) AIR SPEED INDICATOR Fl 22234: The air speed indicator (Fahrtmesser; 100 to 900 km/h) was mounted on the upper left side of the Blind Flying Panel. It was connected to the static as well as dynamic air pressure flexible tube (see figure below). The pitot tube was installed in the left wing tip (in flight direction). The indicated air speed usually did not exactly match the true air speed since the dynamic pressure was not only dependent on air speed but also on air density. The air speed indicator was designed for low altitudes. Hence the error increased with increasing altitude. Therefore the maximum allowed indicated air speed decreased with increasing altitude. The speed limits for different altitudes were indicated with red markings on the instrument front glass (at 400, 500, 600, 700 and 800 km/h for the maximum allowed air speed in 11, 9, 7, 5, and 3 kilometers altitude).
(2) COMBINED ARTIFICAL HORIZON / TURN & BANK INDICATOR Fl 22410, 22411, 22415: The combined artificial horizon and turn & band indicator (Wendehorizont) 1L104 was used for indicating the position of the aircraft with regard to the horizon. It was mounted in the top center of the Blind Flying Panel. The Wendehorizont was driven by a converter, which was attached to the left fuselage side behind the instrument panel. The original spare parts list mentions a Fl 22410. However, all of the three above mentioned types were used (late war fighters usually had a Fl 22411 or Fl 22415).
(5) REMOTE INDICATING COMPASS Fl 23334: The remote indicating compass (Fuehrertochterkompass FT / f2; Geraete-Nr. 127-113 A-2) 1L101 was mounted on the lower center of the Blind Flying Panel. It received the input signals from the main compass (Mutterkompass) mounted in the rear fuselage. There existed different types of this compass. Some had a grey casing, some black. Early types had riveted data plates whereas later ones just had a white imprint. Some of the panels received the latest version of the compass (FT / f8; 127-659 A) with a much shorter casing made out of some kind of plastic. It had a rectangular front and the airplane symbol had just a white outline and was not filled white (some of the FT / f2 had this feature as well).