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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.

Identifier

NASM.1989.0099

Creator

Lenkowsky, Mandel

Date

1935-1952

Provenance

Leslie Lenkowsky, gift, 1989, 1989-0099, NASM

Extent

2.18 Cubic feet (2 records center boxes)

Archival Repository

National Air and Space Museum Archives

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 The collection contains chapters from Mandel Lenkowsky's unpublished manuscript, The Helicopter, and his correspondence with Macmillan Publishing Company.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 note

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

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.

Restrictions

No restrictions on access

Citation

Mandel Lenkowsky Early Vertical Flight Development Collection, Acc. 1989-0099, National Air and Space Museum, Smithsonian Institution.

Topics

Periodicals
Sikorsky (USA) R-4 (H-4) Family
Sikorsky (USA) R-6 (H-6) Family
Sikorsky (USA) XR-6A
Sikorsky (USA) XR-6
Kellet XO-60 Autogiro
Sikorsky (USA) VS-300 Family
Aeronautics
Kellet XO-61 Autogiro
Aeronautics, Military -- Research
Helicopters
Aeronautics, Commercial
Aeronautics, Military
Helicopters -- Flight testing
Sikorsky (USA) XR-5
Sikorsky (USA) XR-4

Type

Collection descriptions
Archival materials
Notebooks
Photographs
Publications