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What Kind Of Engines Are Those?  
User currently offlineMax777geek From Italy, joined Mar 2007, 538 posts, RR: 0
Posted (4 years 5 months 1 week 8 hours ago) and read 2872 times:

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 ?

3 replies: All unread, jump to last
 
User currently offlineViscount724 From Switzerland, joined Oct 2006, 25291 posts, RR: 22
Reply 1, posted (4 years 5 months 1 week 6 hours ago) and read 2795 times:

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.


User currently offline757luver From United States of America, joined Jan 2010, 143 posts, RR: 0
Reply 2, posted (4 years 5 months 6 days 22 hours ago) and read 2593 times:

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!
User currently offlinefaro From Egypt, joined Aug 2007, 1545 posts, RR: 0
Reply 3, posted (4 years 5 months 6 days 21 hours ago) and read 2587 times:

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]


The chalice not my son
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