XO-61觀察機

Pitcairn XO-61(公司型號PA-44和合約名稱MX-157Cully, George & Andreas Parsch: MX-1 to MX-499 Listing , designation-systems.net)是一款由 設計的自轉旋翼機。作為最後生產的旋翼機之一，在與奇力 YO-60和R-4直升機的競爭中，它因後置發動機的冷卻問題以及具有懸停能力的直升機的出現而落選。Gregg, E. Stuart, "Above & Beyond: Jump Ship" . Air & Space Smithsonian, March 2001Harris, Franklin D. An Overview of Autogyros and The McDonnell XV-1 Convertiplane , NASA/CR—2003–212799. NASA Ames Research Center, October 2003

XO-61的合約在G&A收購皮特凱恩飛機公司後由G&A接管。Wings of Freedom Winter 2007/2008 , Volume 22 Number 4, Delaware Valley Historical Aircraft Association.
參考

引用

書籍
Cully, George & Andreas Parsch: MX-1 to MX-499  
Gregg, E. Stuart, "Above & Beyond: Jump Ship". Air & Space Smithsonian, March 2001 Listing, designation-systems.net
Harris, Franklin D. An Overview of Autogyros and The McDonnell XV-1 Convertiplane , NASA/CR—2003–212799. NASA Ames Research Center, October 2003
Wings of Freedom Winter 2007/2008 , Volume 22 Number 4, Delaware Valley Historical Aircraft Association.