SU1946 stands for Simple Universe 1946, it is a series of late-WWII (or prototypes) planes plus some fiction. Planes in this series would have significantly better performance than their historical counterpart, and would receive a "Z" in their names to distinguish them from other, more accurate replicas.

This is the Simple Universe version of the Messerschmitt Me 262 HGII, with V-shaped all-moving tail (Pendelruder in German, hence the "PR" designation).

In our Simple Universe story, the PR series of Me 262 Z HGIIs are built to respond to the threat of the communists' Su-9 KZs, with improved agility. Unfortunately, the superb agility also resulted in poor stability in slower speed, and the HGII PR is both hailed as the best steed for an ace and criticized as the worst widow-maker.

Performance:
Max Speed: 1865 km/h at sea level
Agility: Approx. 7.6 seconds to turn 360 degrees @1448 kph

Armament:
4x 30mm MK213 revolver autocannons (150 dmg, 20 rounds per second, 900 m/s muzzle speed)
9 pylons for bombs and rockets. (maximum advisable load is about 16 tons)
Note: I know the muzzle speed is faster than what you would find in all the data about MK213, but it just doesn't make sense for MK213 to have similar muzzle speed with the MK108 when it uses much larger rounds (30x146 mm compared with MK108's 30x90) and has much longer barrel.
Note2: the 1200 RPM firing rate may be faster than your model update speed, causing some bullets to not be registered. You can use the Overload mod, adjust the outputs, then use USS Tiny to test it out (it has 60000 HP), usually the effect should be minimal.
Note 3: some pylons are pretty close to each other, you might want to watch out when loading some particularly large bombs/missiles as overlapping could cause premature explosion when one of them are fired.

AG1: Tail hook
AG2: Drag chute

CAUTION! Requires the Hispano-Suiza 20mm mod to work properly. If your problem persists even with the mod, try using the Overload and Fine Tuning mod as well.

CAUTION! Due to the fact that we have extremely overpowered engines on SU1946 planes, you need to be extra careful when accelerating these planes. Suggest pushing your stick forwards and do not exceed 20% throttle when taking off. Also, I do not advise flying this plane with keyboard only, but it is entirely flyable with mouse joystick.
EXTRA CAUTION! Even among all the SU1946 series, this one is the most unstable aircraft, avoid following maneuvers:
1. adding too much throttle instantly at speed <500 kph (310 mph) when flying straight or at <700 kph (440 mph) when in high-G maneuvers. an experienced pilot can use this to "drift" their HGII PRs to get extra turning rate, but it is still a dangerous maneuver and require caution.
2. going over 15% throttle when taking off without any ordnance. Start with 10%, after reaching 300kph, go to 15, and if you didn't lose control, SLOWLY add more throttle, like, 5 to 10 % at a time.
3. Rolling when in a High-G turn, this doesn't kill you, it just makes you roll significantly slower. The original HGII doesn't have this problem.
4. Dogfight with rudders, it costs you lots of speed with marginal benefits. Could work as an airbrake though. once you release the rudder, expect a weird shake in the next few seconds, then you'll have normal control.