|Search||Hot Links||What's New!|
Please let me remind all of you--this
material is copyrighted. Though partially funded by NASA, it is still a private
site. Therefore, before using our materials in any form, electronic or otherwise, you need
to ask permission.
There are two ways to browse the site: (1) use the search button above to find specific materials using keywords; or,
(2) go to specific headings like history, principles or careers at specific levels above and click on the button.
Teachers may go directly to the Teachers' Guide from the For Teachers button above or site browse as in (1) and (2).
Title: XB-70A in flight Movie Number: XB-70A Movie Date: 1960s Keywords: XB-70 Format: 320x240 MPEG (2,721 KBytes)
Streaming: Description: Originally conceived as a supersonic bomber, the North American XB-70A Valkyrie instead became the world's largest experimental research aircraft, flying from September 21, 1964 until February 4, 1969. The movie is about 20 seconds in length and shows XB-70A Number 1 from several angles during engine run-up, taxi, takeoff and air-to-air during supersonic cruise. The in-flight view clearly shows two condensation patterns trailing behind the nose of the plane. These are vortex flows, originating from the tips of the canards.
One of the unique features of the Valkyries the variable outer wing panel. It was left undeflected at subsonic speeds to take advantage of the full wingspan and wing area to increase L/D and improve takeoff and landing performance.
At supersonic speeds, adequate cruise L/D can be developed with less wingspan, so the outer panels are folded down. Deflected, they reduce drag as the tips interact with the inlet shock wave in the lower surface flow field. Lowering the tips also reduces the area behind the airplane's center of gravity, which is important because as Mach number increases, the center of pressure move rearward, so less area aft of the cg reduces trim drag. The outer panels also provided more vertical surface to improve directional stability.
Send all comments to firstname.lastname@example.org
© 1995-2017 ALLSTAR Network. All rights reserved worldwide.
Updated: May 25, 2017