Seems there are at least 4 Hortens owned by the Smithsonian. In the early 1990s it looks like 3 were transferred on a loan basis to DTM in Berlin for restoration. Don\'t know where they are now and get a 403 error when I post the NASM\'s URL here, so below is about half the text from the NASM web site that you get when you search on "Horten". NASM web site also has pictures and drawings.
The National Air and Space Museum (NASM) owns four of these unique aircraft, the largest extant collection in the world. Each artifact is one-of-a-kind and there are no other known, original examples.
At the end of 1993, NASM completed negotiations to lend the Horten II L, H IIIf, H IIIh, and the H VI V2 to the Museum für Verkehr und Technik Berlin. This facility is now called the Deutschestechnikal Museum (DTM).
DTM generously agreed to fully restore and preserve these artifacts to NASM specifications. As compensation, NASM will transfer permanently one sailplane to DTM after all four are completed sometime in 2000. They may remain there on loan for several years. The DTM restoration staff of German craftsmen recently completed the Horten II L and are now well-along on the Horten IIIf and \'IIIh.
On December 10, 1993 these aircraft left the Paul Garber Facility in three enormous crates. They arrived in Berlin the following month, marking the start of another interesting chapter in the saga of these unique aircraft.
Operational Histories
Horten II L
The Horten II L, Werk-Nummer (manufacturer\'s construction number, hereafter WNr.) 6, is the third Horten II built but the first of three \'L\' subtypes constructed at Lippstadt, Germany, in 1937. Reimar Horten flew this sailplane at the German National glider competitions later that year. Lacking both cross-country flying experience and a retrieval crew, he did poorly. This airplane bore the German registration D-10-125, applied across the top centersection behind the cockpit.
Horten IIIf
Horten assigned WNr. 32 to a Horten IIIf built in 1944 at Göttingen. The NASM H IIIf may be the last of three \'f\' subtypes built. All three aircraft featured fully-prone cockpits for minimum drag. The pilot stretched flat on his stomach, bent slightly at the waist and knees, feet resting on rudder pedals hinged above his heels. A padded chin rest supported his head which projected into the leading edge of the wing. Clear plastic panels formed the leading edge for several feet above, below, and to either side of the pilot. Visibility was good and drag greatly reduced. However, neither view nor pilot comfort in the H IIIf approached the outstanding qualities of the semi-prone layout Reimar Horten developed for the H IV and H VI sailplanes.
Horten IIIh
Horten craftsmen built this sailplane, WNr. 31, in 1944 at Göttingen. German Registration LA-AI was applied to either side of the ventral fin. Uncertainty surrounds the \'h\' subtype designation. Probably the aircraft first flew as a two-place Horten IIIg. Reimar then modified it into a single-seat glider equipped with special test apparatus. Neither Reimar nor Walter recalls the \'h\' designation so it could even be an Allied invention.
Horten VI V2
Reimar Horten built two Horten VI sailplanes in 1944. He clearly intended to produce an ultra-high performance successor to the Horten IV and these were his prototypes. The Horten VI V1 flew once and survived war\'s end but advancing Allied ground forces destroyed it. The second prototype never flew. It is now in the NASM collection.
During his half-hour flight in the VI V1, test pilot Heinz Scheidhauer found the wings quite "soft" and prone to flutter at over one cycle per second at 128 km/h (80 mph). Scheidhauer\'s findings dampened interest in the second prototype and the war ended before further flight testing.
The Horten brothers built the H VI V2, WNr. 34, late in 1944 in their hometown, Bonn. With this aircraft they advanced the state-of-the-sailplane-art to new levels. Besides the huge aspect ratio and L/D, Horten equipped the H VI V2 for serious soaring. He built a complete oxygen system into this sailplane - ventral fin tank, plumbing, and regulator. It could out-fly all other sailplanes in the world but such outstanding performance cost dearly. Excessive flutter no doubt rendered it too dangerous for competitive flying.
Besides the Horten IIIf, the H VI V2 is the only aircraft in the NASM collections piloted from a prone position. The H VI V2 layout is more aptly described as semi-prone and it differs remarkably from the flat-prone arrangement of the H IIIf.
Discovery and Recovery
Mystery surrounds the wartime recovery of the Horten II L. From unspecified sources Phil Butler claims in War Prizes (Midland Counties Publications, 1994) that the Allies recovered this sailplane in Kempten, Bavaria. During preparation for shipment to DTM in 1994, technicians discovered several tags tied to the canopy frame. These small bits of paper became vital clues to illuminating an historical black hole.
According to one tag, by January 4, 1945, the sailplane was displayed at Freeman Field, IN. Army Air Forces (AAF) Air Technical Intelligence (ATI) assigned the very low enemy equipment number \'T2-7\' to this airplane. \'T2\' denoted an intelligence section in American army terminology. Military personnel often used this organizational shorthand in cables and telegrams. ATI numbered all captured German aircraft to ease inventory and tracking. Thus T2-7 could be the seventh German aircraft either captured or numbered.
Extrapolating from the low T2 number, Freeman Field tag date, and time required for shipment, recovery of the Horten II preceded VE-Day by as much as six months! Exactly how they recovered this sailplane remains unknown but it must be quite a story.
Planning for a covert operation to snatch the Horten II must have started sometime during fall 1944. At that time the AAF was extremely interested in Horten all-wing technology. Jack Northrop\'s failure to meet his multi-million-dollar B-35 contract obligations probably drove the service\'s interest in things Horten. According to Garry Pape\'s fine study, Northrop Flying Wings (Schiffer Publishing, 1995), by March 1944, fundamental aerodynamic problems remained with the XB-35 flight control system. By November, "support for the B-35 was ebbing fast."
In 1944 Reimar Horten entered his eleventh year designing and flying manned, all-wing gliders and powered aircraft. Repeatedly he demonstrated mastery of tailless flight control and stability. Late in the war he even contemplated a design approaching the size and complexity of Northrop\'s huge bomber: the six-jet-engine Horten XVIII. Perhaps the AAF felt that an intact Horten might be useful to the B-35 program.
A British C.I.O.S. (Combined Intelligence Objectives Subcommittee) team discovered the NASM Horten IIIf on June 11, 1945, along with the NASM Horten IIIh. The team found the sailplanes at Rottweil on the Neckar River, approximately 100 km (60 miles) southwest of Stuttgart, Germany. Another team that included the great British sailplane authority, Chris Wills Sr., examined the gliders later that month. One team member wrote a C.I.O.S. intelligence report, describing both sailplanes "in perfect condition in trailers, with a full set of instruments."
ATI must have processed the Horten IIIf, H IIIh, and the H VI V2 nearly sequentially, judging by their T2 numbers. Allied intelligence initially expressed keen interest in these sailplanes. Then, inexplicably, their attention waned and they decided "the Horten Tailless Gliders are of no value to us" according to the Weekly Activity Report-Technical Intelligence-Week Ending 26 June 1945.
The Air Disarmament Division, 9th Air Force Service Command, eventually processed the sailplanes for shipment to the United States. The British flight test center at Royal Aircraft Establishment Farnborough, England, might have held them briefly but their whereabouts cannot be verified for two years.
Operation Seahorse could have swept up the three Hortens. For this important, high-priority project, the Allies combed all of western Europe for the most advanced German aircraft. They loaded them aboard the British escort carrier HMS Reaper and sailed for Britain and the United States. Yet no Horten aircraft is mentioned in the lists of Reaper\'s cargo discovered so far. Besides Reaper, two other vessels left the French coast loaded with captured German aeronautica.
Richard J. Gatling, a Liberty Ship bearing 74 railroad boxcar-loads of recovered material, and several German aircraft destined for Wright Field, sailed from Cherbourg on July 12, 1945. In War Prizes, Phil Butler writes that the cargo included "an engineless Me 262A, a Focke-Wulf Ta 154A night fighter, two Me 163B [rocket fighters] and five sailplanes."
The SS Port Fairy shipped the NASM Blohm and Voss Bv 155 V3 to New York on January 27, 1946. She just might have carried the three Hortens as general cargo. Much of this information on vessels carrying German airplanes comes from Norman Malaney\'s ground-breaking research published in the AAHS Journal, Volume 40, Numbers 1-3, 1995.
Eight days after leaving Cherbourg, HMS Reaper docked at Newark, NJ, bearing her load of war booty. AAF personnel towed the flyable aircraft to nearby Newark Army Air Field. Handpicked AAF pilots then flew the airplanes to Freeman Field, IN, Wright Field, OH, or Patuxant River, MD. The Horten sailplanes and other unflyable material was supposed to travel by rail or truck. Correspondence from Eugene E. Freiburger, former member of the Air Disarmament Division, describes a large quantity of equipment clogging the open pier at Newark for nearly a year. The AAF recalled him to active duty just to process it. The three Horten gliders may have numbered among the hundreds of items that sat forgotten in the sun and salt air.
By 1946 the three sailplanes resided at Freeman Field. Then on October 22, 1947, as Stanley A. Hall explains in his forward to Horten Tailless Sailplanes, the Air Force loaned the Horten IIIf, H IIIh, and H VI V2 to Northrop in Hawthorne, CA, after "joint petition of Northrop Aircraft, Inc., and the Southern California Soaring Association [SCSA]." Northrop requested the sailplanes
Northrop personnel planned to test-fly the two Horten III aircraft but they arrived "damaged beyond reasonable repair [and] too badly damaged to make photography worthwhile."
Despite their condition, a throng of aeronautical professionals turned out to inspect them. Among the curious crowds were Northrop engineers and students of Northrop Aeronautical Institute, members of the Society of Automotive Engineers and the Institute of Aeronautical Sciences. Many SCSA members appeared including engineers from Douglas, North American, Lockheed, and Consolidated Vultee.
Much attention fell on the Horten VI V2 due to its intact state and advanced design and construction. It was nearly flyable but word reached Northrop that the airplane was too dangerous to fly. Northrop returned the sailplanes in 1948. The Air Force stored them at Chrysler\'s World War II aircraft assembly plant at Chicago Orchard Airport, Park Ridge, IL. This huge building also sheltered more than eighty War II Allied and Axis airplanes amassed by the Army Air Forces.
In 1950 hasty preparations for war in Korea forced eviction of more than fifty of these rare, original airplanes. They traveled by rail and any too large to fit a boxcar surrendered to the cutting-torch. This fate befell the NASM Horten II nosewheel strut. Workers cut off and discarded both lower forks - wheel, tire, and all - where the strut protruded from the shipping crate.
These priceless aircraft arrived at an open plot of land near Silver Hill, MD, across the Anacostia River south of Washington. The land became a sad home to many of the world\'s great aviation treasures, now outcasts of war. For over ten years most remained outdoors. Only in 1962 did the site start to take the form we know today as the Paul E. Garber Restoration, Preservation, and Storage Facility.
Russell Lee, 2-9-98
Last edited by Iron City; 28th Oct 2004 at 13:59.