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B707 Engine Pylons?  
User currently offlineDogfighter2111 From United Kingdom, joined Nov 2004, 1968 posts, RR: 1
Posted (9 years 1 month 2 days 6 hours ago) and read 2258 times:

Hey,

This may be a really simple Question, and i am sorry if this has been asked before but why is the No.1 engine pylon different from the others?

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Thanks
Mike

8 replies: All unread, jump to last
 
User currently offlineBlooBirdie From Lesotho, joined Sep 2003, 257 posts, RR: 0
Reply 1, posted (9 years 1 month 2 days 6 hours ago) and read 2225 times:

Here's a close-up picture with the answer built in!


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Photo © Julian Whitelaw



User currently offlineDogfighter2111 From United Kingdom, joined Nov 2004, 1968 posts, RR: 1
Reply 2, posted (9 years 1 month 2 days 6 hours ago) and read 2215 times:

Thanks for the reply, i understnad now.

Thanks
Mike


User currently offlineJetjack74 From United States of America, joined Jul 2003, 7407 posts, RR: 50
Reply 3, posted (9 years 1 month 2 days 5 hours ago) and read 2164 times:
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That's because it lacks a turbocompressor inlet.


Made from jets!
User currently offline113312 From United States of America, joined Apr 2005, 571 posts, RR: 1
Reply 4, posted (9 years 1 month 2 days 5 hours ago) and read 2115 times:

While we are looking at these, please note that all B720 series planes have turbocompressors on the inboard engines only. Most turbofan B707-320 series have turbocompressors on engines 2, 3 and 4. Some operators, like American Airlines opted for turbocompressors on the inboard engines on all of their B707s (120 and 320 series), and all Rolls Royce 420 series along with Pratt 120 and 320 turbojet models have pylons with inlets on all four but not all actually have the turbocompressors in each. Many varients and options on the Boeings.

User currently offlineJustplanesmart From United States of America, joined Mar 2001, 720 posts, RR: 2
Reply 5, posted (9 years 1 month 1 day 18 hours ago) and read 2017 times:

Great source for information about differences with all the 707/720 variants:
http://www.diecastaircraftforum.com/showthread.php?t=21531



"So many planes; so little time..."
User currently offlineDogfighter2111 From United Kingdom, joined Nov 2004, 1968 posts, RR: 1
Reply 6, posted (9 years 1 month 1 day 5 hours ago) and read 1913 times:

Thanks for the great answers, but it seems odd that only 1 engine wouldn't have a turbocompressor. Doesn't it?

Thanks
Mike


User currently offlineDeltaGuy From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 1 month 1 day 1 hour ago) and read 1873 times:

If you look at the FE's panel in detail, you'll see that the #1 engine doesn't have all of the accessories that 2,3, and 4 have...no TR, no turbo, nothing like that. I asked an FE on one when I was flying one for a few hops with the Omega Tanker, he just said that's how it worked with Boeing apparently, a 4th set of engine accessories wasn't needed.

DeltaGuy


User currently offlineDogfighter2111 From United Kingdom, joined Nov 2004, 1968 posts, RR: 1
Reply 8, posted (9 years 1 month 19 hours ago) and read 1848 times:

Quoting DeltaGuy (Reply 7):

Ahh, so it was a sorta money saving idea at the same time?

Thanks
Mike


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