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Info On 707 Testing 727 Engines  
User currently offlineNosedive From , joined Dec 1969, posts, RR:
Posted (7 years 9 months 1 day 22 hours ago) and read 3152 times:

Ok, so I'm bored after my finals here at school, and I was reading a bit about the history of the 707 testing program. This, from Boeing caught my eye:

Quote:
The Dash 80 flew with a fifth engine mounted on the aft fuselage to test installation feasibility for the trijet 727 and with three different types of engines installed at the same time. It investigated engine-thrust reversers, engine sound suppressers, rigs designed to cause in-flight engine icing conditions, air conditioners, and wing flap and slat modifications.

Googleing around isn't doing me any good. What were the results of these tests, sides the 727  Wink, and does anyone have anymore information and pictures?

5 replies: All unread, jump to last
 
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 1, posted (7 years 9 months 1 day 21 hours ago) and read 3142 times:
AIRLINERS.NET CREW
DATABASE EDITOR



Here you go:




2H4





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User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 2, posted (7 years 9 months 1 day 20 hours ago) and read 3118 times:

I'm frightened to ask - were they all operational, or was it literally to test their aerodynamic properties in situ?


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User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 3, posted (7 years 9 months 1 day 20 hours ago) and read 3116 times:
AIRLINERS.NET CREW
DATABASE EDITOR



I believe one of the main goals was to determine whether the engine would receive sufficient airflow behind the wing during high AOA...


2H4





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User currently offlineCitationJet From United States of America, joined Mar 2003, 2434 posts, RR: 3
Reply 4, posted (7 years 9 months 1 day 12 hours ago) and read 3056 times:

Reminds me of Pratt & Whitney's Boeing 720 used as an engine testbed.


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Photo © Alex G.-Denicourt - Contrails Aviation Photography



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Photo © Marc Methot
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Photo © William Pedersen




Boeing Flown: 701,702,703;717;720;721,722;731,732,733,734,735,737,738,739;741,742,743,744,747SP;752,753;762,763;772,773.
User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 5, posted (7 years 8 months 4 weeks 1 day 11 hours ago) and read 2917 times:

Here's another. Photo scanned from the book, Boeing Aircraft: Since 1916 by Peter M. Bowers.

http://i127.photobucket.com/albums/p152/N231YE/367-80JT8Dcopy.jpg

Just to throw in another oddity, the model 367-80 at one time had three different engine types mounted to it:

http://i127.photobucket.com/albums/p152/N231YE/367-803engines.jpg


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