Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
How Does RR Do It?  
User currently offlineLufthansa From Christmas Island, joined May 1999, 3213 posts, RR: 10
Posted (15 years 5 months 6 days 5 hours ago) and read 1614 times:

Hello all

have a look at the RR 524g/h engines as used onboard some 747-400s. have a loot at the fan diameter. It is much smaller than PW or GE engines. i went to the RR web site and the P&W web site, and, found the PW engines to have a diameter of 94 inches, while the roller engine has just 86 inches. Don't know what the GE engine is but my bet would be it would be very close to the PW one.

So, then i had a look at bypass ratios, thinking that perhaps the RR engine bypassed less air. Not so, it was about the same as the PW. It puts out about the same thrust too. So, just how does RR achieve all of this in a smaller engine? Is it the 3 stage shaft design? Does it simplify things so less room is needed in the high stage compressor, thus less room is needed to bypass air? This got me thinking, so i had a look around at other RR engines - the trents, and, the story is the same their. In each Case, the RR engine is smaller than its competitors while offering the same thrust and efficiency, and roughly the same bypass ratios (with the eception of the Trent800 and the GE90 - we won't go there, the rest of the family seems to obay this though) Is there anybody out there who knows the engine well and can explain?

1 replies: All unread, jump to last
 
User currently offlineDash8 From New Zealand, joined Aug 2005, 2 posts, RR: 0
Reply 1, posted (15 years 5 months 5 days 19 hours ago) and read 1614 times:

Only one thought comes to mind. The types of fan blades used on those RB-211 engines are of "wide chord" technology, while the PW in that same period of manufacturing did not use this method.
It leads me to beleive that these blades suck more air maybe, or that the RR engines have a higher fan RPM. I have thought of this some time ago too, and this was all I could come up with.

Dash8


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...
How Does Jetblue Do It? posted Thu Jan 8 2004 23:53:35 by Maiznblu_757
How Does Fedex Do It? posted Tue Feb 8 2000 02:42:02 by Bruce
How Does Southwest Do It? posted Wed Jun 30 2004 01:48:26 by A330Fan1
How Does DL Do Their Bag Service At ATL posted Mon Sep 29 2003 04:18:16 by Flairport
Wheeling & Dealing; How Low-costs Do It posted Mon Mar 11 2002 12:40:37 by Capt.Picard
Circular Runway At ONZ, How Does It Work? posted Mon Sep 11 2006 18:14:07 by Falstaff
Tel Aviv Layover -how Does Your Airline Handle It? posted Thu Aug 17 2006 22:05:06 by Airevents
WN Assigned Seating Out Of SAN. How Does It Work? posted Mon Jul 31 2006 21:10:29 by FutureSDPDcop
IG From VRN: How Does It Perform? posted Mon Jan 23 2006 15:01:04 by Pe@rson
Atis - How Does It Work? posted Tue Jan 3 2006 01:19:30 by Jorge1812