Max777geek
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Posts: 159
Joined: Wed Mar 07, 2007 6:20 pm

What Kind Of Engines Are Those?

Sun Apr 11, 2010 9:00 pm

http://www.airliners.net/photo/Garud...nesia/Convair-990-30A-8/1252882/L/

is that some sort of reverse ? noise countermeasure ? wouldn't that drop down the trust ?
 
Viscount724
Posts: 18831
Joined: Thu Oct 12, 2006 7:32 pm

RE: What Kind Of Engines Are Those?

Sun Apr 11, 2010 10:36 pm

Quoting Max777geek (Thread starter):
s that some sort of reverse ? noise countermeasure ?

GE CJ805-23 turbofans. Looks like the thrust reversers are activated, probably for maintenance. They would normally look like those below.


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Photo © Mel Lawrence
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Photo © Burger Collection



The Convair 880 used a turbojet version of the same engine which was based on the military J79 turbojet that powered several high-performance types including the B-58 Hustler, F-104 Starfighter and F-4 Phantom (exept F-4s built for the RAF which used the R-R Spey turbofan).

The turbofan version on the Convair 990 was unusual in having the fan at the rear of the engine rather than at the front.
 
757luver
Posts: 49
Joined: Sat Jan 02, 2010 9:31 pm

RE: What Kind Of Engines Are Those?

Mon Apr 12, 2010 6:51 am

You gotta love the tug in that picture, reminds me of Luigi or whatever his name was in the movie Cars...LOL!!!!
Long live the 757!
 
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Faro
Posts: 1491
Joined: Sun Aug 12, 2007 1:08 am

RE: What Kind Of Engines Are Those?

Mon Apr 12, 2010 7:14 am

Quoting Viscount724 (Reply 1):
The turbofan version on the Convair 990 was unusual in having the fan at the rear of the engine rather than at the front.

The J79 on which the CJ-805-23 was based was state of the art for its time but retained a single spool. In order to make it more efficient, "piggy-back" fan stages were installed at the rear of the engine, mounted directly on the outer edges of the turbine stages and hence driven by their residual torque. It was the only way to economically enhance performance of the J79 for civil use; otherwise GE would have had to basically redesign the engine with a conventional 2-spool layout.

Faro

[Edited 2010-04-12 00:39:18]
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