Manufacturer: Lockheed

Model: unknown

Name: Sirius

Type: Observation


Status: Experimental

Country: United States

Service: U.S. Air Force

Designation: XO-3D


The Lockheed XO-3D Sirius was an experimental development of the YO-3A Quiet Star with two staggered wings connected at the tips, enlarged rudder, and three-place cockpit.


The Sirius was reworked from a three-view arrangement of the Lockheed YO-3A Quiet Star found on a NASA website. The originality of its configuration lies in the box wing configuration.

Viewers' comments:
  • I simply love your choice of wing design for this craft. ;) (ONI-Defense)
  • Nice design, like the wing concept in use there. (Rekalnus)
  • Your XO-3D is lovely... Wub Nice triplex-boomer! In French we would say "triplace tripoutre", that sounds weird and funny. (Tophe)
  • That tandem-wing Quiet Star is inspired!  :) (apophenia)

My comments: I find it hard to conceive that the little connectors at the wing tips can be seen as "booms"... but thanks anyway!