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Description

Link: www.flickr.com/photos/dizzyfug…

Some background:
The Heinkel He 276 was a night fighter that served with the German Luftwaffe in the later stages of World War II. Its inception dated back to June 1942 when the RLM requested a multi-purpose combat aircraft, the so-called "Arbeitsflugzeug", that could be adapted to various roles and would replace the Bf 110, Ju 88/188 and Do 217.

Heinkel responded with a multitude of designs under the project number P.1065, all of them capable of a speed between 600-700 km/h (373-435 mph) and a ragne form 400-1.000km (248-621 miles) and all driven by piston engines. None of them would enter the hardware stage, though.

In parallel, Heinkel also worked on the fast He 219 "Uhu" night fighter, also a psiton-engined design which was a direct response to the RAF's fast Mosquito night bombers which flew so high and fast that they could operate almost unmolested over Germany. Additionally, the Luftwaffe had to cope with more and intense night bomber raids - it became clear that the number of night fighters was not big enough to cope with this threat, let alone the aircraft's capabilities.

The He 219 was introduced with high hopes, but the advent of the jet age already signalled that the piston-engined fighetr would become obsolete in a matter of months. As stopgap solutions, 1st generation jet aircraft like the Me 262 or the Ar 234 were in hurry converted to night fighters, but this could not hide that fact that a more potent solution was needed - concerning almost any aspect like range, speed, firepower and radar capability.

Plans to augment the He 219 were dropped after intial trials, so that Heinkel decided in September 1944 to develop a completely new aircraft, dedicated to the long range night fighter role. The design team did not start from scratch, though, as the He 219 was already a very good basis to start from, with jigs and tools available for quick production start.

The He 276 A-0 was consequently designed around the He 219 structure, even though all wing surfaces were new. The main wings had a laminar profile for higher speeds in excess of 800km/h, the aircraft was to be powered by two Heinkel-Hirth S011 jet engines in nacelles under the wings.
In order to keep the tail surfcaes free from the jet efflux, the He 219's twin fin arrangement was replaced by a single fin with a cruciform stabilizer above the fuselage level. Since the engine nacelles could not take the landing gear anymore, a new arrangement with wells in the lower fuselage waas introduced - overall the He 276 resembled a lot the much smaller Ar 234.

The radar system was to be the FuG 240 'Berlin', which was still under development, with a (draggy) "antler" antenna arrangement on the nose plus a rearward-facing warning radar. The rarar was operated by a second crew member who's also control the defensive armament, a tail-mounted FDL 131Z barbette. Main armament were four 30mm MK103 machine cannons in the lower fuselage, each with a muzzle velocity of 860 m/s (2,822 ft/s) and firing HE/M rounds at 380 RPM. Like the He 219 the He 276 was equipped with ejection seats.

The first prototype was assembled in record time, and the first flight of the He 276 A-0 took place in August 1945 - only to reveal several shortcomings. One issue was poor directional handling, which could quickly be mended through an enlarged fin surface and a fin fillet, the bigger problem was the unavailability of the HeS011 engine for serial production, and its priority allocation to light fighters.

As a consequence, the engine arrangement was literally revised over night - the He 276 was direly needed in frontline service and no more delays were accepted. This lead to the He 276 B series, which would become the production type.
This version was powered by four of the proven Junkers Jumo 109-004D, an uprated version of the Me 262's engine. The engines were mounted in separate nacelles under the wings, even though these were so close to each other that they looked like a double nacelle.

A further innovation of the B-series was the introduction of the first radar-guided weapons station - the FDL 131ZR was not visually guided (a task that proved to be almost impossible during night sorties), but rather slaved to the radar system which would automatically align and fire the guns. The radar operator could still override the autamatic guidance, but the system was deemed reliable enough for front line use and it effectively relieved the radar operator.

The first production series (B-1) only comprised 10 aircraft, and it was almost immediately replaced by the B-2 which introduced another novelty: the parabolic antenna for the FuG 242 'Schwerin' radar, an improved version of the FuG 240 with longer range and higher sensitivity.
The He 276 B-2 arrived at the Nachtjagdgeschwader in early 1946 and was immediately thrown against Allied bombers and fared surprisingly well.

The He 276 was a simple aircraft, which made production and maintenance relatively easy. It also offered enough development and modification potential - many machines received augmented armament and equipment in form of so-called Rüstsätze, which were later integrated into production and earned the aircraft additional 'U-X' suffixes. These included racks for unguided R4M or RZ 65 rockets under the wings, or several 'Schräge Musik' cannon arrangements, which featured two or four oblique-mounted guns in the fuselage, partly coupled with an optical or radar trigger to fire them automatically when flying under a target.

The He 276 B-2 was the only version to enter service, though - a planned B-3 upgrade with four reheated Jumo 109s (rated at 1.200 kp each) remained on the drawing board.

General characteristics:
Crew: 2
Length (incl. rear antenna): 14.97 m (49 ft 2 in)
Wingspan: 16.56 m (54 ft 3 in)
Height: 5.14 m (16 ft 10 in)
Wing area: 44.4 m² (478 ft²)
Max. takeoff weight: 13,580 kg (29,900 lb)

Powerplant:
4× Junkers Jumo 109-004D jet engines, each rated at 1.015 kp

Performance:
Maximum speed: 916 km/h (494 kn, 568 mph)
Range: 1,540 km (831 nmi, 960 mi)
Ferry range: 2,148 km (1,160 nmi, 1,335 mi)
Service ceiling: 13.300 m (43.564 ft)

Armament:
4 × 30 mm MK 103 cannons in a detachable fairing under the fuselage, 220 RPG;
2× 13 mm MG 131 in an FDL 131ZR tail barbette, 450 RPG;
Factory Rüstsatz "U1" with 4× 30 mm (1.18 in) MK 108 cannons, mounted dorsally as
Schräge Musik (oriented 65° above horizontal), 100 RPG

Two hardpoints under the outer wings, capable of carrying 500 kg each
(normally occupied by 300l drop tanks).

Description

Link: www.flickr.com/photos/dizzyfug…

Some background:
The Heinkel He 276 was a night fighter that served with the German Luftwaffe in the later stages of World War II. Its inception dated back to June 1942 when the RLM requested a multi-purpose combat aircraft, the so-called "Arbeitsflugzeug", that could be adapted to various roles and would replace the Bf 110, Ju 88/188 and Do 217.

Heinkel responded with a multitude of designs under the project number P.1065, all of them capable of a speed between 600-700 km/h (373-435 mph) and a ragne form 400-1.000km (248-621 miles) and all driven by piston engines. None of them would enter the hardware stage, though.

In parallel, Heinkel also worked on the fast He 219 "Uhu" night fighter, also a psiton-engined design which was a direct response to the RAF's fast Mosquito night bombers which flew so high and fast that they could operate almost unmolested over Germany. Additionally, the Luftwaffe had to cope with more and intense night bomber raids - it became clear that the number of night fighters was not big enough to cope with this threat, let alone the aircraft's capabilities.

The He 219 was introduced with high hopes, but the advent of the jet age already signalled that the piston-engined fighetr would become obsolete in a matter of months. As stopgap solutions, 1st generation jet aircraft like the Me 262 or the Ar 234 were in hurry converted to night fighters, but this could not hide that fact that a more potent solution was needed - concerning almost any aspect like range, speed, firepower and radar capability.

Plans to augment the He 219 were dropped after intial trials, so that Heinkel decided in September 1944 to develop a completely new aircraft, dedicated to the long range night fighter role. The design team did not start from scratch, though, as the He 219 was already a very good basis to start from, with jigs and tools available for quick production start.

The He 276 A-0 was consequently designed around the He 219 structure, even though all wing surfaces were new. The main wings had a laminar profile for higher speeds in excess of 800km/h, the aircraft was to be powered by two Heinkel-Hirth S011 jet engines in nacelles under the wings.
In order to keep the tail surfcaes free from the jet efflux, the He 219's twin fin arrangement was replaced by a single fin with a cruciform stabilizer above the fuselage level. Since the engine nacelles could not take the landing gear anymore, a new arrangement with wells in the lower fuselage waas introduced - overall the He 276 resembled a lot the much smaller Ar 234.

The radar system was to be the FuG 240 'Berlin', which was still under development, with a (draggy) "antler" antenna arrangement on the nose plus a rearward-facing warning radar. The rarar was operated by a second crew member who's also control the defensive armament, a tail-mounted FDL 131Z barbette. Main armament were four 30mm MK103 machine cannons in the lower fuselage, each with a muzzle velocity of 860 m/s (2,822 ft/s) and firing HE/M rounds at 380 RPM. Like the He 219 the He 276 was equipped with ejection seats.

The first prototype was assembled in record time, and the first flight of the He 276 A-0 took place in August 1945 - only to reveal several shortcomings. One issue was poor directional handling, which could quickly be mended through an enlarged fin surface and a fin fillet, the bigger problem was the unavailability of the HeS011 engine for serial production, and its priority allocation to light fighters.

As a consequence, the engine arrangement was literally revised over night - the He 276 was direly needed in frontline service and no more delays were accepted. This lead to the He 276 B series, which would become the production type.
This version was powered by four of the proven Junkers Jumo 109-004D, an uprated version of the Me 262's engine. The engines were mounted in separate nacelles under the wings, even though these were so close to each other that they looked like a double nacelle.

A further innovation of the B-series was the introduction of the first radar-guided weapons station - the FDL 131ZR was not visually guided (a task that proved to be almost impossible during night sorties), but rather slaved to the radar system which would automatically align and fire the guns. The radar operator could still override the autamatic guidance, but the system was deemed reliable enough for front line use and it effectively relieved the radar operator.

The first production series (B-1) only comprised 10 aircraft, and it was almost immediately replaced by the B-2 which introduced another novelty: the parabolic antenna for the FuG 242 'Schwerin' radar, an improved version of the FuG 240 with longer range and higher sensitivity.
The He 276 B-2 arrived at the Nachtjagdgeschwader in early 1946 and was immediately thrown against Allied bombers and fared surprisingly well.

The He 276 was a simple aircraft, which made production and maintenance relatively easy. It also offered enough development and modification potential - many machines received augmented armament and equipment in form of so-called Rüstsätze, which were later integrated into production and earned the aircraft additional 'U-X' suffixes. These included racks for unguided R4M or RZ 65 rockets under the wings, or several 'Schräge Musik' cannon arrangements, which featured two or four oblique-mounted guns in the fuselage, partly coupled with an optical or radar trigger to fire them automatically when flying under a target.

The He 276 B-2 was the only version to enter service, though - a planned B-3 upgrade with four reheated Jumo 109s (rated at 1.200 kp each) remained on the drawing board.

General characteristics:
Crew: 2
Length (incl. rear antenna): 14.97 m (49 ft 2 in)
Wingspan: 16.56 m (54 ft 3 in)
Height: 5.14 m (16 ft 10 in)
Wing area: 44.4 m² (478 ft²)
Max. takeoff weight: 13,580 kg (29,900 lb)

Powerplant:
4× Junkers Jumo 109-004D jet engines, each rated at 1.015 kp

Performance:
Maximum speed: 916 km/h (494 kn, 568 mph)
Range: 1,540 km (831 nmi, 960 mi)
Ferry range: 2,148 km (1,160 nmi, 1,335 mi)
Service ceiling: 13.300 m (43.564 ft)

Armament:
4 × 30 mm MK 103 cannons in a detachable fairing under the fuselage, 220 RPG;
2× 13 mm MG 131 in an FDL 131ZR tail barbette, 450 RPG;
Factory Rüstsatz "U1" with 4× 30 mm (1.18 in) MK 108 cannons, mounted dorsally as
Schräge Musik (oriented 65° above horizontal), 100 RPG

Two hardpoints under the outer wings, capable of carrying 500 kg each
(normally occupied by 300l drop tanks).