Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Does Anybody Remember The Boeing 7J7?  
User currently offline757man From United Kingdom, joined Feb 2001, 370 posts, RR: 1
Posted (14 years 11 months 3 days 22 hours ago) and read 2262 times:

I was just wondering if anybody remembered the proposed B7J7 prop-fan airliner which Boeing talked about in around 1989. I know McD actually built an MD-80 demonstrator with the new prop-fan technolgy at about the same time the 7J7 sketches were doing the rounds...So why were both abandoned? Were prop-fan powered aircraft not economical to operate or something?

4 replies: All unread, jump to last
User currently offlineGDB From United Kingdom, joined May 2001, 13605 posts, RR: 76
Reply 1, posted (14 years 11 months 3 days 22 hours ago) and read 2221 times:

l do remember the 7J7, and seeing the MD-80 demonstrator at Farnborough.
In an era of cheap fuel, propfans would have been more trouble than they were worth. Cruising speed would have dropped some too.
They won't be back, advances in engine technology since then have seen to that.

User currently offlineWilcharl From United States of America, joined Jun 2000, 1183 posts, RR: 3
Reply 2, posted (14 years 11 months 3 days 22 hours ago) and read 2222 times:

boeing had the ge prop fan mounted up on a 727 test bed

wasnt the 7J7 twin isle widebody

User currently offlineAA737-823 From United States of America, joined Mar 2000, 6291 posts, RR: 10
Reply 3, posted (14 years 11 months 3 days 16 hours ago) and read 2169 times:

The propfan (also known as UDF or Un-Ducted Fan) was also very noisy. Extremely noisy. Imagine a propeller spinning at near jet engine speeds, and now you have some idea of how noisy it was.

I recently talked to a docent at the Paul Garber facility in Washington DC (connected with the Smithsonian Air and Space) and he said that it only met the stage three requirements if you were standing in the next county. They have the engine at their facility, it's pretty interesting.


User currently offlineGreg From United Kingdom, joined May 2005, 0 posts, RR: 0
Reply 4, posted (14 years 11 months 3 days 4 hours ago) and read 2129 times:

Aviation Week said it would meet Stage III easily.

Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
Does Alitalia Operate The Boeing 767-400 posted Wed Nov 29 2006 20:13:42 by Continental123
Does Anybody Know The Future Of Finnair's MD-11s? posted Mon Jan 23 2006 20:07:23 by Richierich
Does Anybody Know The Reg Of An AF Plane? posted Fri Jul 15 2005 11:54:43 by MADtoCAE
Does Anybody Remember UsAfrica? posted Sat Feb 19 2005 00:58:40 by RootsAir
Does Anybody Remember Aeromech Airlines Which Was posted Fri Jan 23 2004 22:38:08 by MainRunway
Does Anybody Remember CO 727/MD-80 Having PTV'S? posted Thu Nov 6 2003 20:36:12 by AASTEW
Does Anyone Remember The Yellow Bird posted Sat Aug 9 2003 03:25:34 by Funflyer
Does Anybody Know The Status Of Deutsche BA? posted Wed May 7 2003 10:47:56 by BusinessFlyer
Does Anybody Know The Cqfa? posted Wed Feb 9 2000 21:19:19 by RedOne
Does The Boeing 720 Deserve To Be A Separate Type? posted Fri Feb 6 2004 12:15:54 by Duke