What's the actual RPM? If you double the rot. speed of N1, you get around 10.000 RPM
One could argue that a faster rotating LP/N1 turbo-compressor assembly will actually loose efficiency as it will also experience more drag, both aerodynamical and mechanical. This is compensated by fewer turbine stages on the Purepower.
You have to have fewer turbine stages, the goal is to absorb as much energy as possible in as compact a way as possible to produce the necessary speed. If P&W put too many turbine stages, they would absorb more energy as a whole, but would each absorb less, producing less rotational speed.
But do not be mistaken, the faster N1 rotation is for the purpose and only for the purpose of making a narrower core produce sufficient torque to propell the larger fan. By itself, it's not an efficiency gaining measure, rather the opposite.
Airbus A220 (ex-Bombardier CSeries) news
Moderator: Latest news team
Re: GTF engine failure on Cseries test aircraft
http://aviationweek.com/commercial-avia ... gine-eventDetails of what caused the apparent LPT failure, and which part of the three-stage assembly was affected, remain unknown. In the PW1500G, as with all versions of the PW1000G geared turbofan family, the low-pressure spool is de-coupled from the fan by the gear system, which enables it to rotate at around twice the speed of conventional non-geared turbofans for increased efficiency. The higher rotational speed has raised questions over potential maintenance and wear-and-tear issues, but Pratt says the speeds are comparable to well-proven earlier engines such as the JT8D. The engine maker has also focused on new flange and hub designs, as well as blade, stator and outer shroud configurations to handle the running conditions. MTU is responsible for the LPT assembly as well as the first four stages of the low pressure compressor.
Even though speeds are comparable to low BPR engines and turbojet engines, the big difference is that those didn't have to provide torque to a huge fan through the shaft, instead converting that rotational speed directly into thrust.
That the leading test engine of the entire PW1000G family went boom so quickly should be a matter for concern.
It's plausible IMO that the huge torque on the LP turbine running the gear has caused failure of the shaft.
That would explain oil leakage and failure of the oil pump with bits of metals contaminating it.
Once the shaft broke, there would be nothing holding the IPT in place and its rotational energy would be converted into dynamic energy in the form of an uncontained failure.
Well I hope that this is not the case, because a shaft failure this early could point to more than a manufacturing problem.
Re: Bombardier CSeries news
New setback for the CSeries: the jetliner programme is hit with another delay as Braathens Aviation said it would back away from its role as the first operator of the plane and that it may seek other changes to delivery plans, citing "increased uncertainty" and "challenging" market conditions.
The programme was already hit when the jet has been grounded for three months after one of the plane's engines suffered a major failure during ground trials.
Braathens was believed to be scheduled to receive the first CSeries jets next summer after agreeing in 2011 to order 10 of the jets; the accord also contained options for another 10 aircraft.
The programme was already hit when the jet has been grounded for three months after one of the plane's engines suffered a major failure during ground trials.
Braathens was believed to be scheduled to receive the first CSeries jets next summer after agreeing in 2011 to order 10 of the jets; the accord also contained options for another 10 aircraft.
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
New test flights right now for the CSeries "FTV2" after the engine failures three months ago on the FTV1.
Fingers crossed!
Fingers crossed!
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
The Bombardier CSeries prototypes have completed flutter, cold-weather and passenger-evacuation testing passing the 900-hour mark en route to the 2,400 hours expected to be required for certification of the initial CS100 version.
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
The Bombardier CS300 protoype is almost ready for its first flight, which could happen any day now.
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
Bombardier plans first flight of CSeries CS300 jet on Feb. 26., between 9:00-10:00am local time.sn26567 wrote:The Bombardier CS300 protoype is almost ready for its first flight, which could happen any day now.
The outside temperature though will be very cold (about -15°C)
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
CS300 Aircraft First Flight Update
Due to weather conditions in Mirabel, Québec, the first flight of the CS300 flight test vehicle will not take place on February 26, 2015. We expect it will take place very soon. Bombardier thanks all stakeholders for their continued enthusiasm and invites everyone to stay tuned!
Due to weather conditions in Mirabel, Québec, the first flight of the CS300 flight test vehicle will not take place on February 26, 2015. We expect it will take place very soon. Bombardier thanks all stakeholders for their continued enthusiasm and invites everyone to stay tuned!
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
Despite the very cold weather in Mirabel (-26°C), the first flight of the CS300 is confirmed for today, 27 February.
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
A new aircraft is in the air and flying: the Bombardier CSeries CS300, a new entrant against the Boeing-Airbus duopoly in medium-haul aircraft
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
Looking at the A32Fneo and 737MAX, I think Boeing and Airbus won't compete that much with Bombardier anymore. The A319neo and 737-7 MAX (those competing with the CS300) are no-go's for most airlines anymore, most airlines are shifting a size bigger when it comes to these two aircraft families. Leaving the CS300 a bit on its own in the market (except for the yet to fly Russian and Chinese adventures).sn26567 wrote:A new aircraft is in the air and flying: the Bombardier CSeries CS300, a new entrant against the Boeing-Airbus duopoly in medium-haul aircraft
That aside, nice to see both versions flying now! I hope the CS100 test program proceeds well now after the past problems and that the CS300 may have a smoother testing phase (like the smooth 789 certification after the horrendous 788 program xp )
Re: Bombardier CSeries news
I've read somewhere that they have sold 160 CS 300 compared to only about 60 CS 100.
Re: Bombardier CSeries news
I don't know how up to date wikipedia is on this part, but they talk about 180 CS300's and 63 CS100's. It's been a very long time since the last CS100 order (they did get some commitments, but no firm orders), while Bombardier was able to sell some CS300's in 2014 (a big one being an order for 40 by leasing company Macquarie AirFinance)convair wrote:I've read somewhere that they have sold 160 CS 300 compared to only about 60 CS 100.
http://en.wikipedia.org/wiki/List_of_Bo ... ies_orders
Still low sales though, for both versions. I think Bombardier will have to wait for EIS and some early customers being positive about it before they secure significant new deals and the sales really get underway because I believe the potential is there for this aircraft.
Re: Bombardier CSeries news
Are they announcing good performances compared to their competition?
Re: Bombardier CSeries news
The CS300 completed its second test flight today.
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
Qatar Airways says it is no longer interested in ordering any CSeries as result of the Entry Into Service delays.
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
Bombardier risks losing third-largest CSeries customer
Repeated delays and a new financing problem could drive Bombardier’s third-largest customer for the CSeries to cancel the order within a few months.
Moscow-based lessor Ilyushin Finance Corporation (IFC) has decided to “re-evaluate all our options regarding our participation in this programme,” director general Alexander Rubtsov says in an interview.
The review marks a swift change in enthusiasm by the Russian lessor since signing the order for 32 CS300s in February 2014.
http://www.flightglobal.com/news/articl ... er-410987/
Repeated delays and a new financing problem could drive Bombardier’s third-largest customer for the CSeries to cancel the order within a few months.
Moscow-based lessor Ilyushin Finance Corporation (IFC) has decided to “re-evaluate all our options regarding our participation in this programme,” director general Alexander Rubtsov says in an interview.
The review marks a swift change in enthusiasm by the Russian lessor since signing the order for 32 CS300s in February 2014.
http://www.flightglobal.com/news/articl ... er-410987/
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
If you read the news, there at least one thing said, aircraft performance are as good as published
If you don't mind a little extra weight
The rest is geopolitic,financing and timing. Nothing to do with the aircraft.
Did Bombardier already published intentions for Le Bourget ? Can we expect to see both planes ?
If you don't mind a little extra weight
The rest is geopolitic,financing and timing. Nothing to do with the aircraft.
Did Bombardier already published intentions for Le Bourget ? Can we expect to see both planes ?
Re: Bombardier CSeries news
Bombardier plans to bring both versions of its CSeries to the Paris Air Show to drum up interest in the programme and capture more orders.
André
ex Sabena #26567
ex Sabena #26567
Re: Bombardier CSeries news
The CS300 will fly and the CS100 will be on static display.sn26567 wrote:Bombardier plans to bring both versions of its CSeries to the Paris Air Show to drum up interest in the programme and capture more orders.
In addition, Bombardier is considering a third CSeries family member, probably dubbed CS500, that would compete with aircraft like the A320neo and the Boeing 737 MAX8.
André
ex Sabena #26567
ex Sabena #26567