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Mandel Lenkowsky Early Vertical Flight Development Collection

Creator:
Lenkowsky, Mandel  Search this
Extent:
2.18 Cubic Feet (2 records center boxes)
Type:
Archival materials
Collection descriptions
Notebooks
Photographs
Publications
Date:
1935-1952
Summary:
This collection includes notebooks containing scientific notes and mathematical calculations, a random assortment of journals and periodicals, published reference books, and a few advertising and promotional brochures all pertaining to American experimental military and commercial vertical flight from the late 1930s to the late 1940s. The collection also contains photographs of the following helicopters: Sikorsky XR-1, XR-4, YR-4, XR-5, XR-6, XR-6A, VS-300; Kellet XO-60 and XO-61; and Rotachute P-4. Also included are photographs of helicopters by Pitcarin, Landgraf, Greyhound Bus, Spratt, Berliner, Ochmichen, and DeBothezat.
Scope and Contents:
The Mandel Lenkowsky Early Vertical Flight Development Collection contains correspondence, manuscript notes, notebooks of scientific and mathematical notes, periodicals, and published reference materials about experimental military and commercial vertical flight from the 1930s to the 1940s. The collection includes photographs of the Sikorsky XR-1, XR-4, YR-4, XR-5, XR-6, XR-6A, VS-300; Kellet X0-60 and X0-61; and Rotachute P-4 helicopters; as well as the Berliner, DeBothezat, Greyhound Bus, Landgraf, Ochmichen, Pitcairn, and Spratt helicopters.

The collection contains chapters from Mandel Lenkowsky's unpublished manuscript, The Helicopter, and his correspondence with Macmillan Publishing Company. The book was scheduled for publication in the summer of 1945. In his correspondence, Lenkowsky stated he would like to focus primarily on the development of the Focke helicopter (Germany, 1934-37) and was trying to secure rights to mention it in his book. There is no evidence in the collection that Lenkowsky completed the book or that it was ever published.
Arrangement:
The collection is arranged into the following series:

Series I: Correspondence and Manuscript Notes

Series II: Scientific and Mathematical Notes, Aircraft Drawings, and Published Works
Biographical/Historical note:
Mandel Lenkowsky was a civil and aeronautical engineer. He attended the Guggenheim School of Aeronautics at New York University from September 1933 until June of 1937. He later attended the School of Engineering at Princeton University from October to November of 1943. His post graduate work detailed the development of rotary wing aircraft. Lenkowsky was employed as an aeronautical draftsman at the U.S. Naval Air Station, Lakehurst, New Jersey, from February 1941 until June of 1941. In August of 1941, Lenkowsky was employed by the Army Air Forces (A.A.F.) Materiel Center, as a project engineer. Lenkowsky resigned from the Army Air Forces at Wright Field in Dayton, Ohio, in October of 1944 to dedicate full time to the completion of his book on the development of the helicopter.
Provenance:
Leslie Lenkowsky, gift, 1989, 1989-0099, NASM
Restrictions:
No restrictions on access
Rights:
Material is subject to Smithsonian Terms of Use. Should you wish to use NASM material in any medium, Please submit an Application for Permission to Reproduce NASM Material, available at Permissions Requests.
Topic:
Periodicals  Search this
Sikorsky (USA) R-4 (H-4) Family  Search this
Sikorsky (USA) R-6 (H-6) Family  Search this
Sikorsky (USA) XR-6A  Search this
Sikorsky (USA) XR-6  Search this
Kellet XO-60 Autogiro  Search this
Sikorsky (USA) VS-300 Family  Search this
Aeronautics  Search this
Kellet XO-61 Autogiro  Search this
Aeronautics, Military -- Research  Search this
Helicopters  Search this
Aeronautics, Commercial  Search this
Aeronautics, Military  Search this
Helicopters -- Flight testing  Search this
Sikorsky (USA) XR-5  Search this
Sikorsky (USA) XR-4  Search this
Genre/Form:
Notebooks
Photographs
Publications
Citation:
Mandel Lenkowsky Early Vertical Flight Development Collection, Acc. 1989-0099, National Air and Space Museum, Smithsonian Institution.
Identifier:
NASM.1989.0099
See more items in:
Mandel Lenkowsky Early Vertical Flight Development Collection
Archival Repository:
National Air and Space Museum Archives
EDAN-URL:
ead_collection:sova-nasm-1989-0099
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