nosedive
Posts: 2176
Joined: Sun May 23, 2004 2:18 pm

Info On 707 Testing 727 Engines

Thu Dec 07, 2006 12:39 am

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?
 
2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: Info On 707 Testing 727 Engines

Thu Dec 07, 2006 1:14 am



Here you go:




2H4


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BAE146QT
Posts: 981
Joined: Sun Sep 24, 2006 4:58 am

RE: Info On 707 Testing 727 Engines

Thu Dec 07, 2006 2:43 am

I'm frightened to ask - were they all operational, or was it literally to test their aerodynamic properties in situ?
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2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: Info On 707 Testing 727 Engines

Thu Dec 07, 2006 2:46 am



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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citationjet
Posts: 2251
Joined: Sun Mar 09, 2003 2:26 am

RE: Info On 707 Testing 727 Engines

Thu Dec 07, 2006 10:32 am

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


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N231YE
Posts: 2620
Joined: Tue Jul 25, 2006 9:24 am

RE: Info On 707 Testing 727 Engines

Sat Dec 09, 2006 11:11 am

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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