WesWorld

This represents an unsolicited proposal from the Heinkel firm to the German Defence Ministry. No funding has been authorized for any work on the aircraft.



Engine: Four Junkers Jumo 004D axial-flow jet engines rated 10.3 kN thrust
Projected empty weight: 14,950 kg
Projected take-off weight: 20,000 kg
Wingspan: 23.1 metres
Length: 21.1 metres
Wing area: 74.5 metres
Projected maximum speed: 710 kph
Projected cruise speed: 560 kph
Projected ceiling: 11,000 metres
Projected range: 850 kilometres

Intended armament: 3,000 kg of bombs carried internally, six 20mm cannon

Looks interesting. I want to check some real-world early jets of this size before commenting further though.

Wiki says about the P1068/He343:

Quoted

Postwar, the Soviet Union utilized the design as the basis for the development of the Ilyushin Il-22, changing some of the parameters such as size and crew numbers. One prototype was built and flown.

Looking there, it looks like Bruce used the Il-22 figures so I guess that should be okay...

Wiki I fear is talking guff as usual. I've looked up the Il-22 in Yefim Gordon's 'OKB Ilyushin'. The Il-22 was an all-OKB-240 project, launched by a Council of Ministers decree on 12 Feb 1946, the design was completed within a short time despite the lack of experience in developing anything like this before. The mock-up was approved by MAP on 31 Jan 1947 and manufacturers trials began 19 July with a first flight following on 24 July.
The wings used TsAGI airfoils and for the first time effort was put into making sure both wings were manufactured to high degrees of precision, other early Soviet jets suffering from val'ozka, uncommanded wing drops at high speeds owing to inaccurate and different airfoils on each wing! The design team looked at paired nacelles like those on the Ar234B and B-45 and other layouts (including one with two AM-TKRD-1s) but went for individual nacelles. I don't think in any way this was a clone based off the He 343.

The P.1068 indeed uses Il-22 stats. I think the performance is perhaps pessimistic as the Jumo-004D used here is producing 1,000kg more than the TR-1 turbojets used on the Il-22. Officially rated at 12.8 kN (2,900 lbf), Gordon says the Il-22 was basically a flying testbed for the TR-1 and the take-off thrust was actually 1,300 kgp rather than the 1,500-1,600 kgp planned.

Quoted from "BruceDuncan"

This represents an unsolicited proposal from the Heinkel firm to the German Defence Ministry. No funding has been authorized for any work on the aircraft.

Engine: Four Junkers Jumo 004D axial-flow jet engines rated 10.3 kN thrust
Projected empty weight: 14,950 kg
Projected take-off weight: 20,000 kg
Wingspan: 23.1 metres
Length: 21.1 metres
Wing area: 74.5 metres
Projected maximum speed: 710 kph
Projected cruise speed: 560 kph
Projected ceiling: 11,000 metres
Projected range: 850 kilometres

Intended armament: 3,000 kg of bombs carried internally, six 20mm cannon

Only 850 kilometres of range for such type of aircraft
The Arado Ar-234B-2 Blitz had a range 1,630 kilometers with approximately half the weight.
General characteristics

• Crew: 1
• Length: 12.64 m (41 ft 6 in)
• Wingspan: 14.41 m (47 ft 3 in)
• Height: 4.29 m (14 ft 1 in)
• Wing area: 26.4 m2 (284 sq ft)
• Empty weight: 5,200 kg (11,464 lb)
• Max takeoff weight: 9,800 kg (21,605 lb)
• Powerplant: 2 × Junkers Jumo 004B-1 axial flow turbojet engines, 8.83 kN (1,990 lbf) thrust each
• Powerplant: 2 × Walter HWK 109-500A-1 liquid fuelled jettisonable JATO rocket pods, 4.905 kN (1,103 lbf) thrust each (optional)

Performance

• Maximum speed: 742 km/h (461 mph; 401 kn) at 6,000 m (20,000 ft)
• Cruising speed: 700 km/h (435 mph; 378 kn) at 6,000 m (20,000 ft)
• Range: 1,556 km (967 mi; 840 nmi) with 500 kg (1,100 lb) bomb load
• Service ceiling: 10,000 m (32,808 ft)
• Rate of climb: 13 m/s (2,600 ft/min)

Armament

• Guns: 2 × 20 mm MG 151 cannon in tail firing to the rear (installed in prototypes only; never used in military service)
• Bombs: up to 1,500 kg (3,309 lb) of disposable stores on external racks

Your project has too many20 mm cannons, you can remove someone, besides what do you need four dorsal turrets?
The Arado Ar234B-2 had a weight up to 9,800 kg and a maximum thrust of 17.66 Kn and a weight of 9,800 kg, about 554.93kg for Kn; the Heinkel Bomber P937 up to 20,000 kg and 41.2Kn of thrust or 485.44kg/Kn.