My bet for this gauge is Fuel Pressure. That’s useful information to check if the fuel system works as intended.
youu could access the actual real detailed manual for the Junker 52. Admittedly it is in German and runs to several hundred pages but with legendary Deutsche Grundlichkeit, it is very comprehensive. You can find it online.
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there’s aa tutorial video for an Il-2 version https://www.youtube-nocookie.com/embed/2Kkwxw1qFk8
the panel looks different, but what looks like your gauge is identified as a fuel gauge in the video (although there’s 3, one for each engine there…)
Fuel pressure I think, checked on a website:
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" Fuel pressure I think, checked on a website:
Engine Instruments "
Looks very reasonable, it is on the fuel side of the panel (right hand side KraftStoff) and your site shows a listing for a vintage gauge for:
Ar66, Bu133, He46, He72, JuW34, Ju52, Klem L25D, Klem L35, He111, Bf109
that reads out: 0-0.5 Kg/cm2
gauge number: FL 20505
I was looking at fuel gauges last night, all of which displayed much higher pressures, but those were for other aircraft, not the German warbirds. But as the DiscoD link showed, several German warbirds had 0-0.5 Kg/cm2 fuel pressure gauges!
I presume that if the fuel runs out (such as by setting it to 0 in the overhead handlebar of MSFS) the gauge would still show the pressurization is the same. The gauge does stay at 4.9 when fuel is emptied.
Anyway it almost has to be the fuel pressure gauge. Nothing else makes much sense.
I was also thinking about fuel, but…there are other fuel gauges, 1 per engine. Looks like a vacuum gauge for autopilot (telling us that electric is ready to convert electro into air pressure, or air pressure into electric?) and other gyros, but in this case, the place of this gauge must be somewhere near the captain. On some pictures, the border of the same gauge is painted red, like fire extinguisher, but 0.5 0-0.5 Kg/cm2 … the gauge starts to work when electricity is ON - there is no need for fuel gauges, except those which shaw quantity of fuel, to operate in this manner, the same is for breaks or flaps pressure and antifire equipment.
The 3 MAP gauge image shows gauge number FL20555 which is listed on the Engine Instruments link as the ‘Boost Pressure Gauge’ for German warbirds. 1 atmosphere is 30 inches and each .1 atmosphere mark is of course 3 inches to do the conversion in your head while flying and think of inches of MAP while observing the gauges.
I’ve been talking to some of my friends on the AHIII Forums.
They are leaning toward fuel pressure gauge too.
Here are some of their thoughts. Aces High III Forums
There is a Ju-52 model for XP-11 with the same gauge. Does anyone have that model and a documentation?
Well, in Il-2 this gauge (there are 3 of them) is marked in yellow - as fuel. So, on some planes - yes. But is it the same for the type in MSFS? And how it works?
An old FS2004 plane…
cockpit and key (low res.).
1 Air speed Fahrtmesser
V1 90 KMH
VR 120
V2 120
VS 110
VSO 90
VMC 110
VLE 295
VY 160
2 Altimeter 1 Grob-Feinhöhemesser max. 5’500 m
3 Turn and bank Wendezeiger
4 Altimeter 2 Höhemesser
5 Horizon Sperry-Horizont
6 Compass Kompass
7 Clock Uhr
8 Vertical speed Variometer max. 3 m/sec
9 Sperry-autopilot Sperry-Kursgeber
10 Suction Saugkraft
11 Oil temperature IN Schmierstoff-Temperatur Eintritt min. 40 °C
12 Oil temperature OUT Schmierstoff-Temperatur Austritt max. 100 °C
13 Hydraulic pressures Druckmesser Bremsen, Feuerlöscher
14 Fuel Kraftstoffstandanzeiger 2 X 330 gal 2 X 1’250 L
15 Rpm Ferndrehzahlmesser max. 1’850 rpm emergency 2’100
16 Oil pressure Schmierstoff-Druckmesser max. 6 kg/cmq
17 Fuel pressure Kraftstoff-Druckmesser max. 8.5 psi
18 Amps & voltmeters Strommesser, Spannungsmesser
19 Oat temperature Thermometer Aussenlufttemperatur
20 FS2004 icons FS2004 icons
21 Rudder trim Seitensteuer-Entlastung +/- 3 DEG
22 Mixture Höhengasregelung
23 Magnetos Magnetschalter
24 Throttle Normalgasregelung
25 Pitot Vergaservorwärmung
26 Lights Beleuchtung
27 Starters Anlassschalter
28 Fuel valves (2D only) Ventil-Batterie
29 Parking brake Handbremse
30 Cowling flaps Stirnhaubenverstellung
31 Primer Einspritzpumpe
32 Flaps lever Schalter Verstellklappe
33 Pitch trim wheel Handrad Höhenflosse
34 Flaps indicator Anzeige Verstelklappe
0 DEG Cruise 10 start / climb 25 2-mot./ land. 40 land. final
35 Pitch trim indicator Anzeige Höhenflosse
-1.5 DEG start -1 climb + 3.5 cruise
TW Tail wheel lock Spornradverriegelung
=====
Empty weight Leergewicht 14’617 p 6’577 kg
Fuel capacity Kraftstoffmenge 660 gal 2’500 L
Max. start weight Max. Startgewicht 23’100 p 10’400 kg
(the three #17 are fuel pressure in this FS9 aircraft). Only 8.5 PSI
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I don’t believe it to be fuel pressure.
- When you turn on the battery when cold and dark the gauge jumps to a high position when pressure wouldn’t be present
- When you turn on the electric fuel pump, the right hand needle of the three combination gauges directly under “Kraftstoff” (fuel) jump to position
3 With the fuel pump switch off, raising the RPM of an engine will cause the same right hand needle(s) to indicate fuel pressure as the mechanical pump(s) does its(their) job
Looking at Behaviour in developer mode the simvar for hydraulic pressure seems to be loaded.
I found an original German manual from 1939 online. The cockpit in the manual has a lot of different pressure gauges - in addition to the ones mentioned above also a fire extinguisher system pressure, a double gauge for brake air tank pressure and brake air valve pressure as well as brake pressure left and right.
Hydraulic pressure seems most likely.
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