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Western Pathfinder
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« Reply #30 on: August 05, 2018, 01:06:18 » |
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Something about optimal balance V weight distribution iirc.
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Red Squirrel
Administrator
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There are some who call me... Tim
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« Reply #31 on: August 05, 2018, 10:03:08 » |
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24 blades in a Rolls Royce Trent 900 engine...
I've just counted the blades in the Trent 900 I've just finished mounting in my Norton Commando (handles like a pig, but goes like stink) and I can tell you that there are a lot more than 24. However, if we just count the fan blades... |
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Things take longer to happen than you think they will, and then they happen faster than you thought they could.
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martyjon
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« Reply #32 on: August 05, 2018, 10:38:16 » |
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24 blades in a Rolls Royce Trent 900 engine...
I've just counted the blades in the Trent 900 I've just finished mounting in my Norton Commando (handles like a pig, but goes like stink) and I can tell you that there are a lot more than 24. However, if we just count the fan blades... There are blades and blades and blades in a RR Trent 900 cos there is the Low Pressure Compressor, Intermediate Pressure Compressor and High Pressure Compressor and then there are more blades or to use the technical term for them at the back end, stators, on each of the High Pressure Turbine, the Intermediate Pressure Turbine and the Low Pressure Turbine. Most of the air that goes in at the front end of the engine passes over the bulk of the engine and sort of forms a noise absorption barrier to absorb the majority of the noise that comes out of the back end. It is known as a Turbo Fan or triple spool engine. Hence all the positive comments when RR's 211 came out on the L-1011, comments on how quiet it was. Compare it to the Olympus used on Concorde, a twin spool engine. |
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Red Squirrel
Administrator
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There are some who call me... Tim
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« Reply #33 on: August 05, 2018, 20:33:57 » |
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Quite so. Lockheed weren't all that delighted when RR went bust though, and it is no coincidence that the TriStar marked the end of Lockheed as a commercial jet maker.
Just to be clear, blades go round and stators/vanes stay still and direct the gases. There are plenty of each at both ends of an engine, generally taking turns.
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Things take longer to happen than you think they will, and then they happen faster than you thought they could.
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martyjon
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« Reply #34 on: August 05, 2018, 21:29:49 » |
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Quite so. Lockheed weren't all that delighted when RR went bust though, and it is no coincidence that the TriStar marked the end of Lockheed as a commercial jet maker.
Rolls-Royce did not go bust, what happened was that problems with the RB211 meant that had Rolls-Royce continued as they were, warranty claims would have pushed them "over the brink" and the then Tory Government were informed and advised that the company be liquidated. So on 04 February 1971 the original Rolls Royce was placed into liquidation and Rolls Royce (1971) was born. It is true that many suppliers to the company lost large sums but I suppose the situation was one of which one could describe as which was the "lesser of evils". |
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Christina Biggs FOSBR
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« Reply #35 on: August 05, 2018, 21:50:11 » |
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I was there too, where, the WECA» meeting.
Hi Marty, not sure I remember seeing you there on Friday 27 July, or is this Tardis-speak for Friday 28 September? Tina |
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martyjon
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« Reply #36 on: August 05, 2018, 21:56:09 » |
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I was there too, where, the WECA» meeting.
Hi Marty, not sure I remember seeing you there on Friday 27 July, or is this Tardis-speak for Friday 28 September? Tina We had coffee together and I brought one back 4 DR, |
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Red Squirrel
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There are some who call me... Tim
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« Reply #37 on: August 06, 2018, 12:01:34 » |
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Quite so. Lockheed weren't all that delighted when RR went bust though, and it is no coincidence that the TriStar marked the end of Lockheed as a commercial jet maker.
Rolls-Royce did not go bust, what happened was that problems with the RB211 meant that had Rolls-Royce continued as they were, warranty claims would have pushed them "over the brink" and the then Tory Government were informed and advised that the company be liquidated. So on 04 February 1971 the original Rolls Royce was placed into liquidation and Rolls Royce (1971) was born. It is true that many suppliers to the company lost large sums but I suppose the situation was one of which one could describe as which was the "lesser of evils". OK, they would have gone bust if they hadn't been seen as 'too big to fail'... I started working for RR in the 1970s and was there when it was privatised. I couldn't imagine why they would want to move from a 'cost-plus' basis, where they estimated the cost of a project and were then paid 10% over by the government, to a commercial basis where they took their own risk (up to a point) and made their own profits. There is a parallel here with out present nationalised railway: The nationalised RR Ltd would see a business opportunity, set a budget, and then wait months or years for Whitehall to assess the benefits. By the time funding was agreed, there was a good chance that the requirement might have changed or disappeared, so it had to go back to the committee for more second-guessing; on the other hand sometimes they'd do most of the engineering work on a project only to have the funding pulled for political reasons. |
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Things take longer to happen than you think they will, and then they happen faster than you thought they could.
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martyjon
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« Reply #38 on: August 06, 2018, 12:20:24 » |
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Quite so. Lockheed weren't all that delighted when RR went bust though, and it is no coincidence that the TriStar marked the end of Lockheed as a commercial jet maker.
Rolls-Royce did not go bust, what happened was that problems with the RB211 meant that had Rolls-Royce continued as they were, warranty claims would have pushed them "over the brink" and the then Tory Government were informed and advised that the company be liquidated. So on 04 February 1971 the original Rolls Royce was placed into liquidation and Rolls Royce (1971) was born. It is true that many suppliers to the company lost large sums but I suppose the situation was one of which one could describe as which was the "lesser of evils". OK, they would have gone bust if they hadn't been seen as 'too big to fail'... I started working for RR in the 1970s and was there when it was privatised. I couldn't imagine why they would want to move from a 'cost-plus' basis, where they estimated the cost of a project and were then paid 10% over by the government, to a commercial basis where they took their own risk (up to a point) and made their own profits. There is a parallel here with out present nationalised railway: The nationalised RR Ltd would see a business opportunity, set a budget, and then wait months or years for Whitehall to assess the benefits. By the time funding was agreed, there was a good chance that the requirement might have changed or disappeared, so it had to go back to the committee for more second-guessing; on the other hand sometimes they'd do most of the engineering work on a project only to have the funding pulled for political reasons. I started there when it was still Bristol Siddeley Engines Limited, was there to hear the fateful announcement in 1971, was there when it was re-privatised and took full advantage of the free and matching offer in the share sale and followed my fathers loyalty in obtaining my long service award for 25 years service too, a gold watch from Garrards, the Queens jewellers. |
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TonyK
Global Moderator
Hero Member
Posts: 6594
The artist formerly known as Four Track, Now!
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« Reply #39 on: August 06, 2018, 21:02:27 » |
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24 blades in a Rolls Royce Trent 900 engine...
I've just counted the blades in the Trent 900 I've just finished mounting in my Norton Commando (handles like a pig, but goes like stink) and I can tell you that there are a lot more than 24. However, if we just count the fan blades... There are blades and blades and blades in a RR Trent 900 cos there is the Low Pressure Compressor, Intermediate Pressure Compressor and High Pressure Compressor and then there are more blades or to use the technical term for them at the back end, stators, on each of the High Pressure Turbine, the Intermediate Pressure Turbine and the Low Pressure Turbine. Most of the air that goes in at the front end of the engine passes over the bulk of the engine and sort of forms a noise absorption barrier to absorb the majority of the noise that comes out of the back end. It is known as a Turbo Fan or triple spool engine. Hence all the positive comments when RR's 211 came out on the L-1011, comments on how quiet it was. Compare it to the Olympus used on Concorde, a twin spool engine. Listen, I said I didn't know! I didn't expect a sort of Spanish Inquisition. |
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Now, please!
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Red Squirrel
Administrator
Hero Member
Posts: 5451
There are some who call me... Tim
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« Reply #41 on: August 07, 2018, 09:10:13 » |
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Our chief weapon is the GRIP▸ process...
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Things take longer to happen than you think they will, and then they happen faster than you thought they could.
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JayMac
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« Reply #42 on: August 07, 2018, 11:43:21 » |
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... and Control Period spending... Our two weapons are the GRIP▸ Process and Control Period spending... and a ruthless inefficiency... Our three weapons are the GRIP process, Control Period spending, a ruthless inefficiency... and an almost fanatical devotion to Chris Grayling...
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"A clear conscience laughs at a false accusation."
"Treat everyone the same until you find out they're an idiot."
"Moral indignation is a technique used to endow the idiot with dignity."
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Western Pathfinder
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« Reply #43 on: August 07, 2018, 11:47:53 » |
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It will be the Comfy Chair for you next time BNM.
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paul7575
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« Reply #44 on: August 07, 2018, 12:16:31 » |
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It will be the Comfy Chair for you next time BNM.
Only if he takes a car... Paul |
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