JAM747
Topic Author
Posts: 524
Joined: Thu Feb 03, 2005 12:17 am

Two Different Engine Makes On The Same Aircraft?

Thu Sep 29, 2005 1:57 am

Can a jet aircraft have two different makes of engines on at the same time? For example can it have a RR on one side and have a GE on the other side?

[Edited 2005-09-28 18:59:24]
 
G4Doc2004
Posts: 120
Joined: Thu Feb 19, 2004 7:49 am

RE: Two Different Engine Makes On The Same Aircraft?

Thu Sep 29, 2005 2:18 am

No, due to how the plane is certified, the TCDS or certification allows it to be airworthy ONLY if equipped with the engines specified on its certification data sheet, thereby ensuring the aircraft will perform according to the manufacturers specs.

Now, in theory, you could obtain an STC to do this, but I have a hard time believing the FAA or other agency would approve it.
"Failure to prepare is preparing to fail"--Benjamin Franklin
 
777wt
Posts: 828
Joined: Wed Jan 19, 2005 7:45 am

RE: Two Different Engine Makes On The Same Aircraft?

Thu Sep 29, 2005 2:32 am

The 787 has engine interchangeablity plan in the design.

You could swap it between GE and RR if the buying airline only wants GE and the selling airline has the RR powered 787.

However they did bring up the possibily of running different brand engines, like GE on one side and RR on the other with just a software change.
This is that if you went somewhere remote and there's no GE avail there but happens to have RR avail, It can be put on and sent on it's way.
 
2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: Two Different Engine Makes On The Same Aircraft?

Thu Sep 29, 2005 10:41 am




Quoting JAM747 (Thread starter):
Can a jet aircraft have two different makes of engines on at the same time?





Sure.



Six Pratt & Whitney R-4360-53 radial piston engines, and four General Electric J47-19 turbojets:









http://www.military.cz/usa/air/post_war/b36/b36infl.jpg

http://prototypes.free.fr/xf90/images/b36(ficon)_05.jpg




View Large View Medium
Click here for bigger photo!

Photo © David Swain
View Large View Medium
Click here for bigger photo!

Photo © Ted Quackenbush







2H4


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pilotpip
Posts: 2820
Joined: Fri Sep 19, 2003 3:26 pm

RE: Two Different Engine Makes On The Same Aircraft?

Thu Sep 29, 2005 11:09 am

If you were to do an engine swap, the powerplants aren't the only thing that would need to be changed. You'd also be changing items like the Fuel Control Unit, generators, and in some cases, cockpit guages. It's not very cost effective and means that two parts have to be stocked for one airplane, mechanics have to have two manuals for one aircraft, etc.
DMI
 
darkblue
Posts: 227
Joined: Thu Sep 11, 2003 10:27 pm

RE: Two Different Engine Makes On The Same Aircraft?

Thu Sep 29, 2005 10:32 pm

One of the biggest issues of mixing engines is engine control. RR requires the pilot to set power based on EPR. GE uses fan speed. Certainly a flight computer could be designed to manage the 2 types of control systems at the same time, but this is no minor issue.

Yes, the 787 will have interchangeable engines, but I'm not aware of any plan to allow a mixed configuration.
 
2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: Two Different Engine Makes On The Same Aircraft?

Fri Sep 30, 2005 5:57 am




...Almost forgot about the Ryan FR-1 Fireball:


1 x Wright R-1820-72W Cyclone radial piston engine, 1,425 hp

1 x General Electric J31 turbojet, 1,600 lbs thrust






http://ails.arc.nasa.gov/Images/Aeronautics/jpegs/A-7223_a.jpeg





http://www.studenten.net/customasp/axl/image/foto/9-1-2004-14-5-ryan_fr1_14_drawing_a_crowd.jpg




2H4


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