English: The second Lockheed XH-51A, BuNo 151263, following its conversion into a compound rotorcraft testbed. The single J60 turbojet, stub wings and other refinements allowed the XH-51 Compound to set an unofficial rotorcraft level-flight speed record in June 1967. The chin-mounted probe carried special test intrumentation.
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本圖原來發表於Flickr,作者為San Diego Air & Space Museum Archives,網址為https://flickr.com/photos/49487266@N07/4562030384;經FlickreviewR於2017-08-03 19:35:26審查後,確認本圖以No known copyright restrictions釋出,相容於維基共享資源。然而上述的授權條款與來源處不同,因而無法確定本頁所提供的授權條款是否有效。
This image, originally posted to Flickr, was reviewed on 11 November 2011 by the administrator or reviewerLeoboudv, who confirmed that it was available on Flickr under the stated license on that date.
{{Information |Description ={{en|1=The second Lockheed XH-51A, BuNo 151263, following its conversion into a compound rotorcraft testbed. The single J60 turbojet, stub wings and other refinements allowed the XH-51 Compound to set an unofficial rotorcraf