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)

(Continued from page 17)

Pentecost HX-1 Model 100 Hoppi-Copter (one of a kind)

Pitcairn-Cierva PCA-1A (sole survivor)

Platt-LePage XR-1 (one of a kind)

P-V Engineering Forum PV-2 (one of a kind)

P-V Engineering Forum XHRP-X (one of a kind)

Ryan X-13 (one of two survivors)

Vertol VZ-2 (one of a kind)

Vought V-173 (one of a kind)

Vought-Sikorsky XR-4C (one of a kind)

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