*I don’t understand how to do historical report on this forum, so I am here.
Hello, I am currently looking at the “archives de Haute-Garonne” which uploaded all the construction plan for the D.520.
Here are some problem I saw in the game.
The water radiator is too big, and he is too efficient.
We have several witness claiming the engine was overheating during fast climb (220 km/h IAS), in game this is not the case and only a 5% opening is enough to deal with heat. So this is probably why:
The modelised water radiator is way too big in the model.
Here is the current one in game: massive radiator under the wing
Here is the construction plan for this radiator:
Source, page 103
Here is an illustration of how it should be (part 21)
In game we should see something like this:
BTW, the frontal water tank is too big too.
aileron articulation are not accurate (btw, just modelisation if you rework the 3D model)
First little modelisation problem, how the flaps are fixed (this is a really minor 3D model problem but now you know)
How it should be:
There is no command to change oil radiator opening, but there is in game
In game, we can both change Water radiator opening, and oil radiator.
The real plane have only one command: it is for water control.
Water command IRL:
Water command in game:
Oil radiator IRL:
In game the oil radiator is maybe a bit small, but this is pretty accurate if we forgive the oil command
In the pilot flight manual, we read there is a command for water radiator opening, but no mention of oil radiator control.
There should be only 2 flaps positions.
Flaps can only be on position open or close. There are no combat and take off position.
We see on this document the command tube can only take 2 position, 0 or 80°
(and there is only one position for the command in the cockpit)
How does it works? check the plans:
Any position between those 2 position is not stable.
Here is an image where you see the real flaps position. It support my photomontage with the flaps having a little slide to the rear, and this is not the case in the game!
There is an automatique pitch, but not in game
Simple problem: the propeller Ratier and Chauvière have an auto pitch, we can see it in the cockpit: the pilot can switch between automatique, neutral (when broken) and manual.
Fuel repartition in game is broken.
IRL, when using the D.520 for mission the pilot were cleaning the wing’s tanks and only used the central one.
In game, the fuel is in the wing’s tip which are not protected, leading to a fuel fire each time a lost bullet hit the wings… Even with minimum fuel (39 minutes !!!), the central tank is not full in favor of the wings tanks.
BTW, in pilots notes: “Toutes les évolutions acrobatiques doivent être effectuées réservoirs d�ailes vides, trains et volets rentrés.”
'All aerobatics have to be performed with empty wing’s tanks, gears and flaps up."
Source (not a perfect one, but so old, accurate and lost that it is made with the real notes which are not on the internet)
Wrong animation on the stick
When firing with the 7.5 mm, the red button goes down. This is a wrong interpretation of the commands. The red button is th “bouton poussoir” for breaks! For firing the pilot is using the lever behind the stick!
To select if he shoot with 7.5 or 20mm, it is with the control pannel behind the stick.
In the manuel, the lever is named “doigt de tir”
Gaz command is not moving in the good way
When increasing throttle, the pilot is pulling the manette. If he want to decrease he push it.
This particuliarity of the plane was well known. But I can’t give perfect sources.
We can read here: " Tout à coup, je m’apperçus que le peloton me distançait. La manette des gaz était pourtant tirée à fond."
The translation: “Suddenly, I noticed that the peloton was distancing me. The throttle was nevertheless pulled all the way.”
And here: " je tire la manette des gaz jusqu’à plein gaz."
Meaning “I pull the throttle to full power.”
Compas doesn't work
Simple, since years, D.520’s compas doesn’t move. Bug can be reproduced in test flight.
That is all. I can’t check the wings profils but if needed for the near futur D.520’s 3D model rework (lol) all the ressources and details are in the archive: Avion D.520s. AD31 - Archives départementales de la Haute-Garonne