POWER PLANT: One Heinkel/Hirth HeS 011 turbojet engine, rated at 1,300 kp thrust
PERFORMANCE: No data available
COMMENT: This late WW II Messerschmitt „Projekt Wespe” (Wasp) is mostly unknown, and information on it is incomplete. Two seperate fuselages were designed for the „Wespe”:
Design I had the cockpit located midway along the fuselage, and the single He S 011 jet engine was located at the rear and was fed by a long air duct. A long tapering single fin and rudder was chosen, with the tail planes located about halfway up.
Design II had the cockpit located far forward on the fuselage, and the single He S 011 turbojet was mounted mid fuselage. It was fed by an air duct which wrapped under the forward fuselage, and exhausted below a tail boom with a V- Tail unit.
Both designs used a tricycle landing gear arrangement, with the main gear retracting inwards from the wing and the front gear retracting forwards. No armament was specified, but at this stage in the war two MK 108 30mm cannon would probably have been fitted. Priority for both designs was the use of non-strategic material as much as possible, reduction of time for maintenance and adequate flying characteristics (Ref.: 17).
TYPE: Fighter project, forerunner of the Heinkel He 162
ACCOMMODATION: pilot only
POWER PLANT: one Heinkel-Hirth HeS 011 turbojet engine, rated at 1.300 kp thrust
PERFORMANCE: 615 mph in 19615 ft
COMMENT: The summer 1944 saw limitations of the Messerschmitt Me 262 becoming readily apparent. The basic design predated the war. It was heavy and expensive, and required to precious turbojet engines. A cheap high-performance replacement was needed so in July 1944 the RLM issued a requirement for a new single-turbojet high-performance fighter, known as the “1-TL-Jäger”. Germany’s aircraft companies were quick to realise that this was potentially the most important competition in which they had so far had the opportunity to participate. Designing a successful single-seat fighter carries a huge amount of prestige and the most famous firms – Blohm &Voss, Focke-Wulf , Heinkel, Junkers and Messerschmitt – jumped at the chance to create the successor to not only on the me 262 but perhaps also the Bf 109 and Fw 190 too. The engine was to be a Heinkel-Hirth HeS 011 turbojet and the companies were allowed two months to prepare their first designs, Blohm & Voss had two months more time.
On September 1944 the designs were presented at a meeting at Messerschmitt’s Oberammergau facility. It is not known which designed were presented by Messerschmitt and Heinkel, though it is likely that these were one of the earliest versions of the former’s Me P.1101, and the latter’s He P.1073 or a variant of it. Focke-Wulf put forward a twin-boom design Nr.280 it had been working on since early 1944. Blohm & Voss’s design (P.212) was apparently not ready and furthermore it was agreed that Junkers should also be allowed to submit a tender for the requirement.
On the last day of the meeting, a new requirement was suddenly and for most part unexpectedly issued for what would become the “Volksjäger” (Peoples Fighter). This called for a fighter powered by a single BMW 003 turbojet engine that could reach a maximum speed of 466 mph and have an endurance of 30 minutes at full throttle. It also had to be able to operate from poor airfields.
This urgent demand for new single-turbojet fighter designs that could be built in a hurry from low grade non-strategic materials effectively stalled work on the “1-TL-Jäger” competition for several months, particularly Blohm & Voss, Focke-Wulf, Heinkel and Junkers all hastily drafted entries for the “Volksjäger” contest.
The Heinkel He P.1073, originally designed before July 1944 as a fighter with two Junkers Jumo 004C turbojet-engines, one under the nose and one at its back but now altered to fly with just one Heinkel-Hirth HeS 011, was already close to meeting the “Volksjäger” specification. The Heinkel “Volksjäger”-design He P.1073.01.18 was dated from September 1944, just one day after the specification was issued. This only was possible because Heinkel’s design team had several different variants of the design on the drawing board. The documentation describes the He P.1073.01.18 as a “Kleinst-Jäger” (Midget Fighter) and states it is ”a simplification of the design with HeS 011”. It bears remarkable resemblance to what would become the Heinkel He 162 “Spatz” (Sparrow”) except the wings are simpler and both nose wheel and main gear retract forward into the fuselage. Heinkel’s design received a similarly lukewarm reaction, probably because it was based heavily on the company’s already known “1-TL-Jäger” project. But Heinkel’s representatives pointed out that with aircraft such as the Heinkel He 177 bomber no longer in production there was now spare capacity available at its capacious and well-equipped factories. There is some evidence that on September 23rd 1944 Hitler himself ordered the He P.1073 into mass production as Heinkel He 162.
The variant of the He P.1073 design that finally led to the definitive Heinkel He 162 “Volksjäger” is shown here. The design is dated back from September 10th, 1944 and shows the installation of the turbojet engine on the back. The wings are swept back at 35 degree, the tail plane had a positive dihedral and two fins. Under the fuselage on ventral starboard side a streamlined pannier was fitted holding a MK 108 machine canon and two MG 213C machine guns were oblique mounted in the front at both sides of the pilot’s seat. Work on the final version of the Heinkel “Volksjäger began on October 25th, 1944 and its maiden flight took place on December 6th that year (Ref.: Sharp, Dan: Luftwaffe. Secrets Jets of the Third Reich. Mortons Media Group Ltd, Horncastle, 2015).
POWER PLANT: Two Junkers Jumo 004C, rated at 1050 kp each or two Heinkel/Hirth HeS 011 turbojet engines, rated at 1,200 kp each
PERFORMANCE: High sub-sonic speed (estimated)
COMMENT: The Messerschmitt Me 262 HG IV („Hochgeschwindigkeits-Projekt IV“, „High-speed Project IV“) was a high-speed concept which would be based on the Messerschmitt Me 262 „Schwalbe“ („Swallow“). The design dates back to early 1940 when attempt were made to test the revolutionary turbojet driven aircraft at critical Mach numbers.
Several proposals were calculated on the drawing board and even one design realized:
The Messerschmitt Me 262 V9 HG I was flight tested in January 1944. During the course various aerodynamic improvements were introduced into a basic Me 262 aircraft. The leading edge of the inner wing as well as of the vertical tail was increased to 45 degree, the leading edge of the horizontal tail was swept back to 40 degree, a shallow, low-drag cockpit canopy was installed, and the muzzles were faired over. The highest speed attained by this experimental aircraft being 624 mph.
On the drawing board remained the Messerschmitt Me 262 HG II and Me 262 HG III, both designs in various subtypes with different wings, conventional as well as with “Butterfly”-type tail plane, different engine installation and air intake.
Finally, the Messerschmitt Me 262 HG IV was a basic Messerschmitt Me 262 aircraft with original wing section and low mounted nacelles, housing the turbojet engines, but an intensively modified fuselage similar to the Me 262 HG III/3. The cockpit was placed to the rear of the fuselage merging into the tail plane, fuel tanks and armament was set at the front of the aircraft.
All Messerschmitt Me 262 HG II, Me 262 HG III and Me 262 HGIV were never realized
POWER PLANT: Two Heinkel-Hirth HeS 011 turbojet engines, rated at 1,300 kp thrust each
PERFORMANCE: High subsonic speed, estimated
COMMENT: In early 1941 several high speed versions of the basic Messerschmitt Me 262 were designed on the drawing board. The first of these “Hochgeschwindigkeitsjäger” (HG), (High-speed fighter) was the Messerschmitt Me 262 V9, unofficially called HG I. This aircraft featured modified wing leading edges of the inner wing section, swept angles of stabilizers, and a “Rennkabine” (Racing canopy), shallow, low-drag cockpit canopy and windscreen with low profile.
Other two projects were created following this way: The Me 262 HG II called for an outboard wing of increased chord and an improved air intake and engine installation, and finally the Me 262 HG III, which was the final stage of development. It required more radical modifications, as a new 45 degree swept wing with engines housed in the wing roots. Three variants of the Me 262 HG III are known correspond to the original layout.
Entwurf 1” (Concept 1) had a the original tail plane of the Me 262, “Entwurf 2” (Concept 2) had a butterfly-type tail plane, and “Entwurf 3” (Concept 3) together with various subtypes was considerably altered in the fuselage area, where the cockpit was relocated at the rear and formed a part of the empennage group. The swept back stabilizers were located behind the cockpit. This Messerschmitt Me 262 HG III/ Concept 3 attained a very high state of fighter technology, which in the post-war period was the only realized abroad after a passage of several years.
POWER PLANT: One Heinkel-Hirth HeS 011 turbojet engine, rated at 1,300 kp
PERFORMANCE: 630 mph
COMMENT: In Autumn 1944, in the context of the “Jägernotprogramm” (“Emergency Fighter Program”) the Oberkommando der Luftwaffe (OKL, Luftwaffe High Command) requested for proposals for a new generation of fighter/interceptor aircraft in order to replace the Heinkel He 162 “Salamander” or “Volksjäger” (“Peoples fighter”).
Besides designs such as Blohm & Voss Bv P.212, Focke-Wulf Ta 183, Heinkel He P. 1078, and Junkers EF 128 Messerschmitt proposed its project Me P. 1110 with three different variants.
First of the designs was the Messerschmitt Me P.1110/I, a turbo-jet powered interceptor with a conventional-looking design with the air intakes located in the middle part of fuselage sides above the wing the inlet not protruding the cross section (“Rampen-Einlauf”, “Ramp-air-intake”). The wing was of wooden construction and was swept back to 60 degree at the wing root and 40 degree at the leading edge. The tail plane was conventional with elevators and a vertical fin and swept back. Power was provided by a Heinkel/Hirth HeS 011 turbojet engine. A pressurized cockpit with streamlined fairing, tricycle landing gear and three MK 108 30mm cannon in the nose with a provision for two more in the wing roots was envisaged.
The second design was the Messerschmitt Me P.1110/II that differed from the Me P.1110/I mainly in a V-tail unit and a divided annular air intake behind the cockpit. The advantage of this unusual arrangement was that it would reduce drag by fifteen percent compared to a single nose air intake at the cost of four percent air flow reduction to the jet engines. To increase the air flow a supercharger was provided that additionally withdraw the boundary layer.
Like the Me P.1110/I, the Me P.1110/II had 40 degree swept-back wings, an HeS 011 jet engine and was armed with three MK 108 30mm cannon in the nose with a provision for two more in the wing roots.
The third design the Messerschmitt Me P.1110 “Ente” was of canard configuration with small wings in the front and larger wings in the rear part of the fuselage.
All projects would be soon dropped in favor of the Junkers EF 128 and none of the Messerschmitt designs made it to the prototype stage. (Ref.: 20, 22).
POWER PLANT: Two Junkers Jumo 222 or Daimler-Benz DB 604 (both liquid-cooled) or BMW 802 (radial) piston engines PERFORMANCE: 360 mph
COMMENT: In 1939, the “Technisches Amt des Reichluftfahrtministeriums” (RLM); (Technical Office of the Reich Air Ministry) issued specification for a “Bomber B” requirement.
The Reich Air Ministry ordered the aircraft to replace the Junkers Ju 88 and Dornier Do 217 bombers by 1943. At first four manufacturers submitted plans to the Air Ministry: Arado project E.340, Dornier Do 317, Focke-Wulf Fw 191, and Junkers Ju 288. Later, Henschel was asked to submit its Henschel Hs 130 design due to the expertise of this company with its experiments with pressurized cockpits. Meanwhile, Project “Bomber B” contest winner was the Arado design, officially named Ar 340.
While the designs of all other contenders were of more conventional layout the Arado Ar 340 was designed with a central fuselage containing all four crew members. The cockpit and rear compartment were glazed and pressurized. The projected Junkers Jumo 222 engines were positioned in a unique twin-boom arrangement connected only through the wing assembly, a configuration which offered the crew better visibility. The landing gear was mounted to the load-bearing wing center-section. The tail of the aircraft was a unique design, where the tail plane did not connect the two booms but was cantilevered outwards instead, each similar to the asymmetric Blohm & Voss Bv 141B booms and tail arrangement. Also similarly, this would have provided the rear gunner with a clear range of fire directly behind. The fuselage extended forwards beyond the engines, with the gunners situated behind the cockpit, ahead of the bomb bay and wing spars. The MG 151 cannon in the tail of the central fuselage would have been controlled with remote aiming through periscopes. There were also two remote-controlled “Fernbedienbare Drehlafette FDL 131” 13mm (remotely-controlled gun turrets) to be placed above and below the fuselage.
The Ar 340 was one of the steadily growing numbers of later-war military airframe designs designed to use the troublesome Junkers Jumo 222 engine. Otherwise an innovative design, these powerful engines were selected because they would have allowed the Arado Ar 340 to carry the required payload of 5,900 kg within a relatively compact airframe, despite their still-strictly developmental nature. As the development of the Junkers Jumo 222 engines were cancelled, plans were discussed to power the Arado Ar 340 with Daimler-Benz DB 605 liquid-cooled engines or BMW 802 radial engines. Meanwhile the RLM favoured the Junkers Ju 288 and the Arado project was not pursued.
Ultimately, the entire “Bomber B project” was cancelled, primarily as a result of the failure to develop the required engines (Ref.: 24).
POWER PLANT: Four Heinkel/Hirth HeS 011 turbojet engines, rated at 1,200 kp each
PERFORMANCE: 528 mph
COMMENT: In January/February 1945, only four month before the German “Third Reich” surrendered, Messerschmitt proposed two designs of a “Fernbomber” (Long-distant range/long-range bomber), the Me P.1108/I and –II. Although no post-war information provided by Messerschmitt’s employees could be independently verified, since all data had already been removed by the French it seems that both projects were designed by Dr. Wurster from Messerschmitt to a concept by Dr. Alexander Lippisch.
While the Messerschmitt Me P.1108/I, (design drawing Nr. IX-126 from 28th February, 1945) was a more conventional design with a fuselage, 35 degree back-swept wings and a butterfly-type tailplane, the Me P.1108/II (design drawing Nr.117 from January 12th, 1945) was a flying wing concept with 40 degrees sweep of the leading edge without any tailplane. Common to both projects were the installation of four Heinkel/Hirth HeS 011 turbojet engines, the air intakes were under the wings or in the wings leading edge. Calculated fully loaded weight was to be 30 tons, a range of 4,300 mi at a speed of 500–530 mph and a height of 30,000–39,000 ft. was estimated.
The Messerschmitt Me P.1108/I design had an aerodynamic clear fuselage with circular cross section and low positioned swept back wing with four He S 011 turbojet engines in paired nacelles half-embedded in the wing trailing edge. These were fed by a common intake on each lower wing surface. A two man crew sat in tandem position in a pressurized cockpit in the extreme nose of the aircraft. A tricycle landing gear arrangement was designed, with the main wheels retracting into the fuselage. It was planned that the armament of the production aircraft should consist of three twin 20mm cannon turrets, two located on the back of the fuselage and aft of the cockpit and one under the fuselage. All were remotely controlled from the cockpit.
Understandably, at the end of March 1945, only few weeks before the total collapse of the “Third Reich” Messerschmitt was ordered by the RLM to cease all development on long range bomber designs (Ref.: 15, 20).
POWER PLANT: Six Junkers Jumo 012 turbojet engines, rated at 2,500 kp thrust each
PERFORMANCE: 578 mph
COMMENT: The Junkers EF 132 was one of the last aircraft project developments undertaken by Junkers in WWII, and was the culmination of the Junkers Ju 287 design started in 1942. The shoulder-mounted wings were swept back at a 35 degree angle and featured a small amount of anhedral. Six Junkers Jumo 012 jet engines, each of which developed 2,500 kp of thrust, were buried in the wing roots. Wind tunnel results showed the advantages of having the engines within the wing, rather than causing drag by being mounted below the wing surfaces. Several wooden mockups were built of the wing sections, in order to find the best way to mount the engines without wasting too much space while at the same time providing maintenance accessibility. The landing flaps were designed to be split flaps, and the goal was to make the gearing and operation simple. Because of the high placement of the wings to the fuselage, an unbroken bomb bay of 12 meters could be utilized in the center fuselage. The tail plane was also swept back and the EF 132 had a normal vertical fin and rudder. An interesting landing gear arrangement was planned, that consisted of a nose wheel, two tandem main wheels beneath the center rear fuselage, and outrigger-type wheels under each outer wing. A fully glazed, pressurized cockpit located in the extreme fuselage nose held a crew of five. Armament consisted of two twin 20mm cannon turrets (one located aft of the cockpit, the other beneath the fuselage) and a tail turret containing another twin 20mm cannon. All of the defensive armaments were remotely controlled from the cockpit, and a bomb load of 4000-5000 kg was envisioned to be carried.
A wind tunnel model was tested in early 1945, and a 1:1 scale wooden mockup was also built at the Dessau Junkers facility to test the placement of various components, and also to check different air intake openings in the wing leading edge for the turbojet engines. The development stage had progressed far when the Soviets overran the Dessau complex and took possession of all of the Ju 287 and Junkers EF 131 and Junkers EF132 designs and components. The Soviets gave its approval for the bombed out Junkers Dessau factory to be partially rebuilt, the wind tunnels repaired and the turbojet engine test and manufacturing facilities to be put back into operation. In October 1946, the whole complex and the German engineers were transferred to GOZ No.1 (Gosoodarstvenny Opytnyy Zavod, State Experimental Plant), at Dubna in the Soviet Union, to continue development of the EF 131 and EF 132. Design work on the EF 132 continued under Dr. B. Baade at OKB-1 (the design bureau attached to GOZ No.1), under order of Council of Ministers (COM) directive No.874-266, an unpowered example was constructed to gather additional data, but only slow progress was made before the project was terminated on June 1948, by COM directive 2058-805 (Ref.: 17. 24).
POWER PLANT: Four Junkers Jumo 004C turbojet engines, rated at 1,020 kp each
PERFORMANCE: 510 mph
COMMENT: With its Blohm & Voss Bv P.188 bomber projects the aircraft company proposed several different designs that would have been powered by four powerful turbojet engines. Most unusual was a long, specifically W-shaped wing design. The wings were placed – differing of project – from high to low on the fuselage side. Common to all projects was the layout of wings: their inner halves were swept back 20 degrees while the outer halves were swept 20 degrees forward. It was hoped that this arrangement would provide a better performance, both at high and low speeds.
The Blohm & Voss Bv P.188 bomber project had three different known variants. Blohm & Voss Bv P.188.01 was powered by four turbojets placed in separate nacelles under the wings. The W-shaped wing was placed high on the fuselage, the tail section was of a conventional type.
Very similar in design was the Blohm & Voss Bv P.188 02 except for a smaller, slightly raised cockpit, the wings were placed in mid-fuselage and a tail with a twin rudder arrangement.
The last design was the Blohm und Voss P.188.04 turbojet bomber. The fuselage center section was designed as an armored steel shell which was to hold the fuel supply, with the forward and rear sections being bays for the tandem twin main landing gear wheels. The W-shaped wing was place low on the fuselage and had a constant 3 degree dihedral. A crew of two sat in tandem in an extensively glazed, pressurized cockpit, which was flush with the fuselage. Four Junkers Jumo 004C turbojet engines were mounted in two nacelles, which were located beneath each wing, very similar to the Arado Ar 234C “Blitz” (“Lightning”) turbojet bomber. There were also an auxiliary ‘outrigger’ type landing gear outboard of the engine nacelles, these being more to steady the aircraft, and did not touch the ground when it was on an even keel. The tail was of a twin fin and rudder design, with a dihedral tail plane and the extreme tail had an airbrake. Armament consisted of two remote-controlled FDL 131 Z twin 13mm machine guns, guided by two PVE 11 periscopes aft of the cockpit, and firing to the rear. A bombload of 2000 kg could be carried externally. None of these futuristic projects were realized (Ref: 17, 24).
POWER PLANT: Two Junkers Jumo 004D-1 turbojet engines, rated at 930 kp thrust each
PERFORMANCE: 683 mph at 19.685 ft
COMMENT: The final layout of the Messerschmitt Me 262 “Schwalbe” (“Swallow”) did not come up to all expectations of perfectionist Willy Messerschmitt. He argued that at least the concept of the new revolutionary aircraft is a result of many compromise and need to be improved. One goal is the high speed that can be reached by a turbojet driven aircraft.
Already in 1939 when the first design studies began what later became the Messerschmitt Me 262 Willy Messerschmitt proposed the installation of the turbojet engines into the wing roots in order to reduce drag and save weight. But at that time the plan failed due to the rapid changing dimensions of the first “Sondertriebwerke” (“Exceptional power plants”) as the new turbojet engines are called..
Yet another possibility to reduce drag in high-speed flight was the introduction of swept-back wings. In 1935 Prof. Busemann, an aeronautical research scientist at the aerodynamic institute of the University of Göttingen, discovered the benefits of the swept wing for aircraft at high speeds. He presented a paper on the topic at the Volta Conference at Rome in 1935. The paper concerned supersonic flow only. At the time of his proposal, flight much beyond 300 miles per hour had not been achieved and it was considered an academic curiosity. Nevertheless, he continued working with the concept, and by the end of the year had demonstrated similar benefits in the transonic region as well.
By early 1940 the first precise research findings on swept back wings were available to the German aircraft industry and Messerschmitt proposed in April 1941 to fit up the piston engine driven Messerschmitt Me 262 V1 with a 35 degree swept back wing. Nevertheless, at that time priority was given to the mass-production of the Messerschmitt Me 262 “Schwalbe” (“Swallow”). But with the introduction of this phenomenal aircraft the influence of critical Mach-number (“compressibility”) on subsonic speed became noticeable. In early 1944 research work on development of a high-speed variant of the Messerschmitt Me 262 was done again in three steps as so called “Hoch-Geschwindigkeitsjäger” , suffix “HG” (“High-speed fighter”):
Messerschmitt Me 262 HG I
The leading edge of the inner wing as well as of the vertical tail was increased to 45 degree, the leading edge of the horizontal tail was swept back to 40 degree, a shallow, low-drag cockpit canopy was installed, and the muzzles were faired over.
Messerschmitt Me 262 HG II
A new wing with 35 degree sweep was installed, the engine nacelle was improved, a shallow, low-drag canopy and a butterfly tail-plane was provided.
Messerschmitt Me 262 HG III
Improvements were a new 45 degree swept-back wing, installation of turbojet engines in wing-root, low-drag canopy and swept-back tail-plane.
The last variant was intensively discussed and tested especially the installation of more powerful turbojet engines (Heinkel-Hirth HeS 011). Of several sub-variants most radical was the Messerschmitt Me 262 HG III/ Concept III. As with many other projects the end of WWII stopped all further work on the Messerschmitt Me 262 HG III and variants (Ref.: 20, 24).
Scale 1:72 aircraft models of World War II
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