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Question On Engine Cowling/shell  
User currently offlineRichiemo From United States of America, joined Jul 2008, 218 posts, RR: 0
Posted (5 years 2 months 1 week 2 days 15 hours ago) and read 2452 times:

Gang, when you look at a commerical jet engine, is the protective shell that surrounds the engine also made by the engine manufacturer, or does another company manufacture it. I always thought that all rolls royce engines have the entire engine encased in one solid tube, as is the case with the 757 rolls and A332/3 rolls engines. But then I realized it isn't the case with the 777 rolls engines. What determines whether the whole engine is encased or if the rear portion is exposed.

2 replies: All unread, jump to last
 
User currently offlineAirframeAS From United States of America, joined Feb 2004, 14150 posts, RR: 24
Reply 1, posted (5 years 2 months 1 week 2 days 15 hours ago) and read 2451 times:



Quoting Richiemo (Thread starter):
Gang, when you look at a commerical jet engine, is the protective shell that surrounds the engine also made by the engine manufacturer, or does another company manufacture it.

I cannot speak for other airlines or engine manufacturers, but at F9, a composite company makes ours. I cannot think of the name of the company at the top of my head, but our cowlings/nacelles are manufactured in California.



A Safe Flight Begins With Quality Maintenance On The Ground.
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (5 years 2 months 1 week 2 days 14 hours ago) and read 2436 times:



Quoting Richiemo (Thread starter):
Gang, when you look at a commerical jet engine, is the protective shell that surrounds the engine also made by the engine manufacturer, or does another company manufacture it.

Often another company. It's usually designed by the airframer and built by some other company. In some cases, the nacelle design is done as part of the engine package (RR does this most often) but, even then, they may contract construction out to someone else.

What with mergers and divestitures, it gets murky. Boeing used to do their own via Boeing Wichita, but now that's Spirit Aerosystems. Middle River Aircraft Systems used to be independent, I think, but now they're part of GE.

Quoting Richiemo (Thread starter):
I always thought that all rolls royce engines have the entire engine encased in one solid tube, as is the case with the 757 rolls and A332/3 rolls engines.

RR does prefer the enclosed plug, but it's not required, as you noted on the 777. There's a trade between weight, noise, and efficiency depending on how much of the plug you cover.

The "solid tube" is always at least three parts...the inlet, the fan cowl, and the thrust reverser. The difference between the long and the short ones is how long the thrust reverser is.

Quoting Richiemo (Thread starter):
What determines whether the whole engine is encased or if the rear portion is exposed.

Design tradeoff during initial design. There isn't a "right" answer, just different balances of factors. The fully enclosed style seems to be going out of favour, since it was mostly RR that did it and they've abandoned it for the 787 and A350.

Tom.


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