Platt-LePage XR-1: Perbedaan antara revisi

'''Platt-Lepage XR-1''', juga dikenal dengan sebutan perusahaan PL-3, adalah helikopter twin-rotor awal Amerika, dibangun oleh Platt-Lepage Aircraft Company dari Eddystone, Pennsylvania. Pemenang kompetisi desain Amerika Serikat Army Air Corps diadakan pada awal 1940, XR-1 adalah helikopter pertama diuji oleh USAAF, terbang pada tahun 1941.

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* {{cite web |url=http://www.nasm.si.edu/collections/artifact.cfm?id=A19600305000 |title=Platt-LePage XR-1 |first=Roger D. |last=Connor |coauthors=Russell Lee |year=2000 |publisher=Smithsonian National Air and Space Museum |accessdate=2010-12-02 |archive-date=2011-04-02 |archive-url=https://web.archive.org/web/20110402204039/http://www.nasm.si.edu/collections/artifact.cfm?id=A19600305000 |dead-url=yes }}

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