RB211 Nomencalture
Thread Starter
Joined: Sep 2004
Posts: 124
Likes: 0
From: The Heart of Asia
RB211 Nomencalture
If someone tells me that the variant is the RB211-524G/HT, am I correct in assuming that this is an RB211-524G engine, with an aftermarket HT mod?
If so, what exactly is the HT mod? Couldn't find much on the Rolls website.
If so, what exactly is the HT mod? Couldn't find much on the Rolls website.
Joined: May 2004
Posts: 54
Likes: 0
From: UK
The T means they are buit with a Trent core (HP System). They have 24 fuel burners as apposed to 18 on a non Trent core. And produce 60,600 Lbs thrust as opposed to 58000lbs thrust on the G.
It increses fuel econ and lowers harmful NOx gass emmisions,
The can of course be rated to G or H when fitted to the 747-400 by means of the FAFC rating plug. BA has trent core engines but most if not all are G rated. Im an avionics chap. No doubt someone will give a more lengthy explination.
It increses fuel econ and lowers harmful NOx gass emmisions,
The can of course be rated to G or H when fitted to the 747-400 by means of the FAFC rating plug. BA has trent core engines but most if not all are G rated. Im an avionics chap. No doubt someone will give a more lengthy explination.
Junior trash
Joined: Nov 1999
Posts: 1,025
Likes: 0
From: UK
Its a RB211-524 engine either G or H rated depending on the gizmo discussed above but with a trent core. If its BA i believe all ours are G rated now. As H rating cost more maintenance than the payload reduction out of MEX JNB etc on hot days is worth.
Joined: Jul 2004
Posts: 17
Likes: 0
From: Home for bewildered engineers
>If so, what exactly is the HT mod? Couldn't find much on the Rolls website.
Right, something I can answer.
Early/mid 1980's, Boeing were developing the 747-400, and RR wanted a piece of the action. They developed the RB211-524G-19 engine, with 56,870lb MTO thrust, for the 744 airframe (the -19 signifies the 744 aiframe.)
British Airways order this, but also wanted the same engine for the 767-300 to ease maintenance and repair.
So, RR used exactly the same engine, but pushed the throttle to 60,600lb MTO to suit the 763. This became the RB211-524H-36 (-36 = 763 airframe.)
Having dome the increased thrust for the 763, why not do it for the 744. Thus, they also did the RB211-524H-19.
Fast Forward to Mid 90's The Trent 700 had been designed, and certified for the Airbus A330, and showed better fuel consumption than the RB211. Operators ALWAYS want lower fuel costs, so RR looked at using the Trent 700 HP system in the 524G/H.
Physically, it fitted unaltered, and I think there were only a few minor changes to the neighbouring hardware. The new engine configuration was certified as a new engine mark number, and customers bought the new 04 module kit if they wanted. It had the same thrust and operating limits, so intermix wasn't an issue.
With the new heart, sorry, HP System,
the RB211-524G-19 became the RB211-524G-T-19,
the RB211-524H-36 became the RB211-524H-T-36, and
the RB211-524H-19 became the RB211-524H-T-19.
Right, something I can answer.
Early/mid 1980's, Boeing were developing the 747-400, and RR wanted a piece of the action. They developed the RB211-524G-19 engine, with 56,870lb MTO thrust, for the 744 airframe (the -19 signifies the 744 aiframe.)
British Airways order this, but also wanted the same engine for the 767-300 to ease maintenance and repair.
So, RR used exactly the same engine, but pushed the throttle to 60,600lb MTO to suit the 763. This became the RB211-524H-36 (-36 = 763 airframe.)
Having dome the increased thrust for the 763, why not do it for the 744. Thus, they also did the RB211-524H-19.
Fast Forward to Mid 90's The Trent 700 had been designed, and certified for the Airbus A330, and showed better fuel consumption than the RB211. Operators ALWAYS want lower fuel costs, so RR looked at using the Trent 700 HP system in the 524G/H.
Physically, it fitted unaltered, and I think there were only a few minor changes to the neighbouring hardware. The new engine configuration was certified as a new engine mark number, and customers bought the new 04 module kit if they wanted. It had the same thrust and operating limits, so intermix wasn't an issue.
With the new heart, sorry, HP System,
the RB211-524G-19 became the RB211-524G-T-19,
the RB211-524H-36 became the RB211-524H-T-36, and
the RB211-524H-19 became the RB211-524H-T-19.
Joined: Jul 2004
Posts: 17
Likes: 0
From: Home for bewildered engineers
Yes, the 524G was the first RB211-524 with Wide Chord Fan Blades, though it used the technology developed for the RB211-535E4 engine. Now, they are everywhere.
RR did consider selling the WCFB as a mod on the 524, but I guess there would be problems with thrust vs speed.
If you wanna get picky, the first RB211 with a wide chord fan was the RB211-22, which had plastic/composite blades. However, tchnology wsn't up to the job, so aluminium clappered blades became the basic standard. Or so I've been infomed by a good source.
RR did consider selling the WCFB as a mod on the 524, but I guess there would be problems with thrust vs speed.
If you wanna get picky, the first RB211 with a wide chord fan was the RB211-22, which had plastic/composite blades. However, tchnology wsn't up to the job, so aluminium clappered blades became the basic standard. Or so I've been infomed by a good source.
Even an engine change can be achieved in about 3 hours.
Joined: Jul 2004
Posts: 17
Likes: 0
From: Home for bewildered engineers
> With regards to nomenclature, is it true that the proper name for
> a Trent 700 (for example) is something like RB211-Trent-700 etc.?
The full name is, for example
RB211-Trent-768-60/99
which breaks down as
RB211 The Family Name ('all' thrree shaft engines are RB211's.)
Trent A sort of Brand Name
7xx Part of the Trent 700 design (designed for around 70,000lb thrust.)
x68 Specifically, rated to give 68,000 lb thrust at sea level.
-60 Configured for the Airbus A330
/99 With the special features as requested by Air Rockall
Actually, I hear that the Trent 1000 for the Boeing 787 will be a Trent 1000, not an RB211-Trent 1000, but that may just be a rumour.
> a Trent 700 (for example) is something like RB211-Trent-700 etc.?
The full name is, for example
RB211-Trent-768-60/99
which breaks down as
RB211 The Family Name ('all' thrree shaft engines are RB211's.)
Trent A sort of Brand Name
7xx Part of the Trent 700 design (designed for around 70,000lb thrust.)
x68 Specifically, rated to give 68,000 lb thrust at sea level.
-60 Configured for the Airbus A330
/99 With the special features as requested by Air Rockall
Actually, I hear that the Trent 1000 for the Boeing 787 will be a Trent 1000, not an RB211-Trent 1000, but that may just be a rumour.
