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M2dude
January 18, 2011, 05:28:00 GMT permalink Post: 6186366 |
Good to have you back here again Howie
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Really alternate side Ignitors? All RR aero engines I have worked on always sparked up both sides every time, well the Avon, Spey 202, RB199 & the Oly 20202 (Vulcan) and industrial Oly did. Would this have made a difficulty with starting logic?? Was there LH & RH Ignition selector switch maybe?
There was no automatic ignition selection logic as such built into the start sequence, but a manually selected L & R ignition selector switch. The reason of course to alternate L & R selection during starting was to detect otherwise dormant ignition failures if 'BOTH' was always selected. (Modern A/C with AUTOSTART do not have this problem, if an ignitor fails during the engine start sequence the other is automatically selected and an ignition status message is set on the lower EICAS screen). The ignition L/R selector switch was bypassed during engine operation by the auto-ignition system, where if the engine control unit detected a flame out (set at 58% N2) both ignitors would automatically fire up. The sequence would release onece the perceived N2 rose above 63%. The ignition system had several reliability issues, the first was the plugs themselves. Penetration into the 'can' was crucial; if it were more than about 130 thou', the tip would very quickly burn off. We soon learned that a penetration check was vital when fitting a plug and shims needed to be used to get the correct penetration. The other reliability issue was the ignition leads themselves; For the first 10 years of service they were a major pain until 'they' (Rolls-Royce) finally got it right. Also until Rolls modified the lead clipping, it could take 3 to 4 HOURS to change a lead. The dual channel HEIU itself was as good as gold, and seldom let us down, It was a very powerful 8 Joule 2KV beast, and you obviously treated it with utmost respect. Best regards Dude ![]() Last edited by M2dude; 18th January 2011 at 06:28 . Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
flying lid
January 26, 2011, 20:16:00 GMT permalink Post: 6205197 |
A snippet of information from Concorde's past, from an unlikely source.
I recently read a book entitled "The Somerset & Dorset Railway, Then and Now" by Mac Hawkins. An interesting comment is made regarding Winsor Hill Tunnel (Near Shepton Mallet), which was used, in 1968, after the line was closed and lines lifted, by Rolls Royce for destructive tests on the Olympus engine destined for Concorde. To quote the book, " Up to the late 1980's the tunnel's portals were obscured by massive steel doors, built a little in front of the stonework and supported by a frame. These where constructed as an anti-blast measure by Rolls Royce in 1968, who used the tunnel for destructive tests on the Olympus engine for Concorde. They ran an engine without oil, expecting it to blow up within 20 minutes or so, but in the event it laster for well over two hours !. The tunnel's use for this purpose was only over a few days, planning permission having been sought from Shepton Mallet RDC as a matter of course, in case an explosion caused a change in the local topography" I originally posted the above in the Qantas A380 thread, as that seems to be all about RR trent engines & lubricating oil matters. Perhaps it's better here as a testiment to the technical savvy of RR many years ago. Anyone remember these tests ?. Quite a good thread this. Sadly I've never flown Concorde, but have visited her at Manchester, Duxford & Yeovilton. The one at Yeovilton had the engine access door open, allowing one to gaze up into the technical wizardry of the engine. The access door itself amazed me, doubles as some sort of oil tank, complete with heavy, precision made piano type hinges !! A model of Concorde graces the family mantelpiece. Edited to add link regarding above story Windsor Hill Tunnel Lid Last edited by flying lid; 5th February 2011 at 19:29 . Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
howiehowie93
January 30, 2011, 13:25:00 GMT permalink Post: 6212624 |
Olympus Picture
SSD wrote:
G-BOAC engine no. 1.
Also I heard of a similar test on the RB199; ran it up on a test bed to full power and let it stabilise for a few minutes, drain the Lube Oil Tank and stand back to see what happens - 24 hours later they gave up as it was still running !! ![]() Possibly a standard RR development test ? ![]() regards Howie Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
Jane-DoH
April 03, 2011, 20:16:00 GMT permalink Post: 6348525 |
Bellerophon
You call 3-2-1 Now, start your stopwatch, pre-set to countdown from 58 seconds, and slam the throttles fully forward till they hit the stops. Four RR Olympus engines start to spool up to full power and four reheats kick in, together producing 156,000 lbs of thrust, but at a total fuel flow of 27,000 US gallons per hour. A touch of left rudder initially to keep straight, as the #4 engine limiter is limiting the engine to 88% until 60 kts when it will release it to full power. The F/O calls
Airspeed building, 100 kts, V1
, and then, at 195 kts,
Rotate
. You smoothly rotate the aircraft, lift-off occurs at around 10\xb0 and 215 kts. You hear a call of
V2
but you keep rotating to 13.5\xb0 and then hold that attitude, letting the aircraft accelerate.
The F/O calls Positive Climb and you call for the Gear Up . On passing 20 feet radio height, and having checked the aircraft attitude, airspeed and rate of climb are all satisfactory, the F/O calls Turn and you slowly and smoothly roll on 25\xb0 left bank to commence the turn out over Jamaica bay. Some knowledgeable passengers will have requested window seats on the left side of the aircraft at check-in, and are now being rewarded with a very close look at the waters of Jamaica Bay going by very fast! As you accelerate through 240 kts, the F/O calls 240 and you pitch up to 19\xb0 to maintain 250 kts and keep the left turn going to pass East of CRI. ![]() Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
M2dude
April 08, 2011, 06:13:00 GMT permalink Post: 6357473 |
Jane-DoH
One of the real beauties of the Concorde intake was that it was completely self-startiing, and so unstarts as such were never heard of. Regarding the vibrations thing, here is my post #80:
The reason that #4 engine was limited to 88% N1 on take-off was an interesting one, down to something known as 'foldover effect'. This was discovered during pre-entry into service trials in 1975, when quite moderate levels of first stage LP compressor vibrations were experienced at take-off, but on #4 engine only. Investigations revealed that the vibrations were as the result of vorticies swirling into #4 intake, in an anti-clockwise direction, coming off the R/H wing leading edge. As the engine rotated clockwise (viewed from the front) these vorticies struck the blades edgewise, in the opposite DOR, thus setting up these vibrations. The vorticies were as a result of this 'foldover effect', where the drooping leading edge of the wing slightly shielded the streamtube flowing into the engine intake. #1 engine experienced identical vorticies, but this time, due to coming off of the L/H wing were in a clockwise direction, the same as the engine, so were of little consequence. It was found that by about 60 KTS the vorticies had diminished to the extent that the N1 limit could be automatically removed. Just reducing N1 on it's own was not really enough however; some of this distorted airflow also entered the air intake through the aux' inlet door (A free floating inward opening door that was set into the spill door at the floor of the intake. It was only aerodynamically operated). The only way of reducing this part of the problem was to mechanically limit the opening angle of the aux' inlet door, which left the intake slightly choked at take off power. (The aux' inlet door was purely aerodynamically operated, and diff' pressure completely it by Mach 0.93).
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Jane-DoH
April 09, 2011, 00:35:00 GMT permalink Post: 6359223 |
M2dude
One of the real beauties of the Concorde intake was that it was completely self-startiing, and so unstarts as such were never heard of.
I seem to remember that Rolls Royce proposed a solution of their own, whre the right hand pair of engines would rotate ant-clockwise (viewed from the front) rather than the clockwise norm for just about any 'Roller' that I can think of. Although this would have completely solved the vibration problem, and was great business for the folks at RR in Patchway (just about doubling the required number of engines) it was a pretty lousy idea if you were an airline and required a much latger holding of spare engines.
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ChristiaanJ
November 16, 2011, 23:00:00 GMT permalink Post: 6811291 |
So here is mine
On Wikipedia they tell us there were 20 Concordes built, 14 production and 6 pre production There were two prototypes , 001 and 002 (the ones with the odd porthole visors). There were two preproduction aircraft: 01, the British one, with a full 'look-through' visor' and 02, the French one, the first one that looked like the production model, with both a 'full' visor, and the 'pointy' tail. Then there were two 'near-production' aircraft, that were used for certification, route-proving, and suchlike, but that never entered airline service (201 and 202, now best known as 'F-WTSB' and "Delta-Golf"). And yes, then there were 14 production aircraft, that in the end all made it into service with BA and AF.
Also Wiki tell us there were 67 olympus 593 engines built
Forgive me but this does not seem possible, not enough engines were built to satisfy 'new' engines for 'new' planes on the production line. The '67' figure probably refers only to the version of the 593 engnes for the production aircraft (4x14=56, plus spares), and not to the earlier versions used for development/testing, for the prototypes, the preprods and the cerification aircraft.
Does this mean that the 6 pre production a/c donateded some engines to production aircraft so some BA and AF planes flew, even from new, with 'used' engines??
Funnily enough, there's a current discussion on a French Concorde forum on the same subject, trying to figure out not only exactly how many engines were built, but also the "where are they now?". It would be a nice item to add to the "Concorde Story". We may have to appeal to the RR Historical Trust to open their archives, and tell us exactly how many Olympus 593's were built, and what they can tell us about their history. CJ Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
Mike-Bracknell
December 06, 2011, 11:39:00 GMT permalink Post: 6845507 |
Anyone got \xa31.25m under the sofa?
Concorde Rolls-Royce Olympus 593-610 Turbojet Engine with Reheat | eBay Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
peter kent
October 31, 2012, 21:58:00 GMT permalink Post: 7496372 |
593 smoke reduction
ref question from Joliste
why were the Olympus 593 s so smoky to start with, did they use excess fuel to help with cooling as some petrol engines do or was there some design feature which caused the smoke. It seeems to have been cured in later engines
rod "Development of Pollution Controls for Rolls-Royce RB211 and Olympus 593 Engines" by A B Wassall. I have picked out stuff relevant to the question: The engines of the day generated smoke in the primary zone and partially consumed it in the rest of the combustor. It was easier to reduce the production than increase the consumption but leaning the primary zone had an adverse effect on relight capability which then needed its own corrective action as was done on the 211. Metal temperatures went up with the leaning (as intimated by Joliste) The 593 did not have the leaning option as it had to maintain an over-rich primary zone at TO to ensure an adequate weak extinction margin when throttled back at completion of supersonic cruise when the combustor had to operate at A/F ratios over 180. In addition to the smoke problem the combustor weight and pressure loss had to be reduced. These other two requirements led to the annular combustor and vaporizers which also reduced the smoke substantially. These three benefits were expected based on Pegasus experience. Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
peter kent
October 10, 2013, 00:12:00 GMT permalink Post: 8090941 |
SNECMA reheat
I've always seen it mentioned as SNECMA reheat until the other day..
The ORIGINAL design for the reheat was done by SNECMA, but due to them getting into all sorts of trouble with the fuel injection system and flame stabilisation, Rolls-Royce baled them out, and it became a Rolls-Royce/ SNECMA design. ref heritageconcorde.com Does anyone have any details on the 'joint' development alluded to above? Thanks. Last edited by peter kent; 10th October 2013 at 00:14 . Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
CliveL
October 14, 2013, 14:06:00 GMT permalink Post: 8098479 |
The ORIGINAL design for the reheat was done by SNECMA, but due to them getting into all sorts of trouble with the fuel injection system and flame stabilisation, Rolls-Royce baled them out, and it became a Rolls-Royce/ SNECMA design.
ref heritageconcorde.com Does anyone have any details on the 'joint' development alluded to above? ![]() The problem apparently was that flame stabilisation operating in "contingency" rating was sensitive to the point that every engine had to be checked, so there was a lot of engine plus reheat testing, most of which was done at Patchway. The solution was addition of some form of 'spike' at various points on the spray bar (my informant wasn't very specific). It sounded like a sort of vortex generator cum chine that gave the flame somewhere to latch onto. The development process was, as you suggested, a joint activity. Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
howiehowie93
July 29, 2016, 17:40:00 GMT permalink Post: 9455879 |
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fill_ot
November 01, 2023, 21:33:00 GMT permalink Post: 11531535 |
Olympus 593 ECU PCB identification
This may be a bit of a long shot.
I am trying to identify the function of two printed circuit boards from an Olympus 593 Engine Engine Control Unit (ECU). I worked on Concorde and its ECUs at Filton for many years in the 1970s and 80s. When Concorde retired in 2003 I requested from British Airways and was given 2 ECU PCBs as a souvenir. There were of course 8 ECUs on each aircraft, 2 per engine. Each ECU had about 20 different PCBs. I have sometimes wondered just what the function was of my 2 PCBs. Maybe someone knows or has the relevant ECU Overhaul Manual. I have already asked various organisations for help - Ultra Electronics the manufacturers of the ECUs, British Airways, Rolls-Royce Heritage Trust and some museums. I've had some helpful replies but no actual answers. Marked on the PCBs ae their drawing numbers: 46546-629-0 and 46456-602-0. I have tried to attach some photos but there seems to be some forum setting that's preventing this! Thanks Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
Jhieminga
November 10, 2023, 07:35:00 GMT permalink Post: 11536526 |
This may be a bit of a long shot.
I am trying to identify the function of two printed circuit boards from an Olympus 593 Engine Engine Control Unit (ECU). I worked on Concorde and its ECUs at Filton for many years in the 1970s and 80s. When Concorde retired in 2003 I requested from British Airways and was given 2 ECU PCBs as a souvenir. There were of course 8 ECUs on each aircraft, 2 per engine. Each ECU had about 20 different PCBs. I have sometimes wondered just what the function was of my 2 PCBs. Maybe someone knows or has the relevant ECU Overhaul Manual. I have already asked various organisations for help - Ultra Electronics the manufacturers of the ECUs, British Airways, Rolls-Royce Heritage Trust and some museums. I've had some helpful replies but no actual answers. Marked on the PCBs ae their drawing numbers: 46546-629-0 and 46456-602-0. I have tried to attach some photos but there seems to be some forum setting that's preventing this! Thanks Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
Lawrence2725
November 26, 2023, 12:28:00 GMT permalink Post: 11546244 |
This may be a bit of a long shot.
I am trying to identify the function of two printed circuit boards from an Olympus 593 Engine Engine Control Unit (ECU). I worked on Concorde and its ECUs at Filton for many years in the 1970s and 80s. When Concorde retired in 2003 I requested from British Airways and was given 2 ECU PCBs as a souvenir. There were of course 8 ECUs on each aircraft, 2 per engine. Each ECU had about 20 different PCBs. I have sometimes wondered just what the function was of my 2 PCBs. Maybe someone knows or has the relevant ECU Overhaul Manual. I have already asked various organisations for help - Ultra Electronics the manufacturers of the ECUs, British Airways, Rolls-Royce Heritage Trust and some museums. I've had some helpful replies but no actual answers. Marked on the PCBs ae their drawing numbers: 46546-629-0 and 46456-602-0. I have tried to attach some photos but there seems to be some forum setting that's preventing this! Thanks Whether either of them would release it to you, even now, I am doubtful. Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
tdracer
December 18, 2023, 20:41:00 GMT permalink Post: 11558877 |
Concorde engine sells on ebay:
Concorde Engine Finally Sells On eBay, Afterburner Included (msn.com)
The
Concorde
turbojet engine
spent years listed on eBay
before it finally sold for \xa3565,000 (or $714,500). This particular
Rolls-Royce
Olympus turbojet spent its service life fitted to a British Airways Concorde. It\x92s been 20 years since the supersonic airliner\x92s final flight, but the Concorde is
still remembered fondly
as emblematic of
a more ambitious era
of commercial aviation.
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