One-and-Onlies: The Complete List

All the Smithsonian’s one-of-a-kind aircraft

A Wiseman-Cooke biplane hanging in the National Postal Museum, one of the Smithsonian's one-of-a-kinds. (Eric Long/NASM)

By Patricia Trenner

airspacemag.com
August 13, 2012

(Continued from page 16)

Herrick HV-2A (one of a kind)

Hiller XH-44 (one of a kind)

Kaman K-225 (one of two survivors)

Kellett XO-60 (sole survivor)

Kellett XR-8 (sole survivor)

McDonnell XV-1 (one of two survivors)

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