Search found 207 matches

by CowAnon
Mon Sep 20, 2021 12:41 am
Forum: Civil Aviation
Topic: Embraer New Turboprop Aircraft News and Discussion Thread
Replies: 490
Views: 67565

Re: Embraer New Turboprop Aircraft News and Discussion Thread

- The position of the engine was a way of looking for less noise; - Modern, new generation and smaller diameter propellers can help, especially in the tractor configuration; - The CBA-123 was aerodynamically very clean, with an efficient wing and had good cruising speed (335 knots). ... My comment:...

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by CowAnon
Mon Sep 13, 2021 6:06 am
Forum: Travel, Polls & Preferences
Topic: Why no Boeing 707 stretch?
Replies: 21
Views: 4604

Re: Why no Boeing 707 stretch?

Those Flight International articles are archived here: http://web.archive.org/web/20160421172704/http://www.flightglobal.com/pdfarchive/view/1965/1965%20-%200802.html http://web.archive.org/web/20160420233731/http://www.flightglobal.com/pdfarchive/view/1965/1965%20-%201564.html (first page only, con...

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by CowAnon
Sun Sep 12, 2021 8:12 am
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

In March of 2021, Boeing purchased two former DL MD-90s from the boneyard in BYH and flew them to VCV (N962DN & N908DA). It’s plausible these aircraft were acquired to be used as testbeds. Might an updated UDF concept be a conceivable purpose for these aircraft? :scratchchin: If that's what Boe...

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by CowAnon
Sat Sep 11, 2021 5:04 am
Forum: Non-Aviation
Topic: My "Solution" To The California Drought
Replies: 76
Views: 3151

Re: My "Solution" To The California Drought

Very good point, but that ship has sailed. So, since wholesale relocation of the population is out of the question and there are few areas with the ideal climate for all the food production that comes from the Central Valley, other solutions are necessary. Desalination is the most obvious but there...

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by CowAnon
Thu Sep 09, 2021 10:06 pm
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

A few tidbits from the FlightGlobal article: Fan diameter has been significantly reduced, to 144-156in (365-396cm) – in line with the external diameter of a current-generation single-aisle engine – enabling installation on a narrowbody-size aircraft. ... The RISE demonstrator engine will be sized t...

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by CowAnon
Thu Sep 09, 2021 9:35 pm
Forum: Technical/Operations
Topic: Modern Turbofan Engine Efficiency
Replies: 40
Views: 10108

Re: Modern Turbofan Engine Efficiency

One other thing I want to emphasize. When you talk with engineers they rarely if ever mention thermodynamics. Honestly I do not think most understand it that well, and they tend to get lost in the micro engineering details. Bottom line: The greater the temperature variance between the hot chamber a...

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by CowAnon
Mon Sep 06, 2021 9:10 am
Forum: Travel, Polls & Preferences
Topic: Will commercial flying ever become obsolete?
Replies: 42
Views: 3952

Re: Will commercial flying ever become obsolete?

China has a MagLev solution that connects Beijing and Shanghai, and even the most populous nation of Earth cannot make it work between two of its largest cities. There isn't a maglev between Beijing and Shanghai. Shanghai does have a 29-km maglev line between its city center and Pudong airport, and...

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by CowAnon
Sun Sep 05, 2021 4:16 am
Forum: Technical/Operations
Topic: Modern Turbofan Engine Efficiency
Replies: 40
Views: 10108

Re: Modern Turbofan Engine Efficiency

Ultrafan gear system has been run up to 85,000 hp. Clearly a very different design to PW's gear - so no patent lawyers necessary! "(The gear system) is a planetary-style gearbox with a ring gear on the outside and five planet gears inside, rotating around a central sun gear. The design drives ...

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by CowAnon
Tue Aug 31, 2021 6:43 pm
Forum: Travel, Polls & Preferences
Topic: Was the McDonnell Douglas MD-90 a good airplane?
Replies: 24
Views: 2431

Re: Was the McDonnell Douglas MD-90 a good airplane?

This might be an inconvenient opinion, but I dare to say, that the MD-90 was a superb aircraft, an industry benchmark and years ahead of its competitors - but 15 years late... Beside the new engines and a slight stretch to comply with those new and heavier engines, the MD-90 is mostly unchanged to ...

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by CowAnon
Mon Aug 30, 2021 5:44 am
Forum: Travel, Polls & Preferences
Topic: Was the McDonnell Douglas MD-90 a good airplane?
Replies: 24
Views: 2431

Re: Was the McDonnell Douglas MD-90 a good airplane?

Another interesting thing about the plane ... McDonnell Douglas had planned an MD-90-40 derivative that was 52.3 meters long (almost 8 meters longer than the A321, and nearly 10 meters longer than the 737 MAX 10). It would've held 170-180 passengers in three-class seating, or 217 passengers in singl...

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by CowAnon
Mon Aug 30, 2021 5:31 am
Forum: Travel, Polls & Preferences
Topic: Was the McDonnell Douglas MD-90 a good airplane?
Replies: 24
Views: 2431

Re: Was the McDonnell Douglas MD-90 a good airplane?

It seems to me that the MD-90 model that was launched was a huge Delta order in November 1989 was nearly the same as what MDD had proposed in March 1984: a 57-inch stretch of the MD-80 with new V2500 engines. So if McDonnell Douglas had proceeded with that concept at the time, they would've had over...

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by CowAnon
Fri Jul 16, 2021 12:14 am
Forum: Civil Aviation
Topic: Canada to back Pratt & Whitney turboprop hybrid engine technology -sources
Replies: 18
Views: 2544

Re: Canada to back Pratt & Whitney turboprop hybrid engine technology -sources

"Previously, Pratt said the hybrid-electric propulsion system could yield an average fuel savings of 30% for regional prop planes."

I wonder what engine(s) PW is comparing against to get a 30% savings.

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by CowAnon
Tue Jul 06, 2021 11:16 pm
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

AW published a follow-up with a few more details: CFM Details Open-Fan Plan For Next-gen Engine (Aviation Week, 6/25/2021) The RISE open fan will include a new compact high-pressure core to boost thermodynamic efficiency, as well as a recuperating system to preheat combustion air with waste heat fro...

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by CowAnon
Thu Jun 24, 2021 6:37 pm
Forum: Civil Aviation
Topic: Aerosmena AIDBA airships
Replies: 0
Views: 511

Aerosmena AIDBA airships

I'm not sure why, but there's a long writeup about a hybrid airship concept from Russia in Machine Design magazine. It would be cool if one of these designs broke through, but the success rate of these concepts isn't encouraging. Innovative Airships Could Change the Face of Transport Aircraft (Machi...

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by CowAnon
Thu Jun 24, 2021 6:14 pm
Forum: Civil Aviation
Topic: Washington State Aviation Thread - 2021
Replies: 200
Views: 24465

Re: Washington State Aviation Thread - 2021

Does KBFI actually have something hindering its expansion other than boeing?? Like does it not have room to expand? Facing climate concerns, will King County stop Boeing Field expansion? (Crosscut, 6/9/2021) That makes the KCIA Master Plan Update, now underway, a big deal. King County is proposing ...

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by CowAnon
Wed Jun 23, 2021 5:59 pm
Forum: Civil Aviation
Topic: Washington State Aviation Thread - 2021
Replies: 200
Views: 24465

Re: Washington State Aviation Thread - 2021

I like the notion of relocating the JBLM base to central or eastern Washington, as mentioned in a news link on the first page. With the freed-up land you could actually place a behemoth DEN or DFW-sized airport with 8 runways that could replace Sea-Tac on a fraction of JBLM's property. Politically t...

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by CowAnon
Tue Jun 22, 2021 8:37 pm
Forum: Technical/Operations
Topic: Jet engines in the 2020s and 2030s.
Replies: 17
Views: 5886

Re: Jet engines in the 2020s and 2030s.

The second article opined that Boeing would need to launch a single-aisle clean-sheet replacement later this decade, but that would be too early for the RISE, and only a more conventional engine with smaller efficiency improvement would be available. For me this means Boeing better hurry up with its...

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by CowAnon
Tue Jun 22, 2021 8:17 pm
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

A tweet from the author of the FlightGlobal article says CFM downplayed the role of the gearbox but noted that the details were proprietary. I interpret that as saying CFM doesn't have a good gearbox solution and has a lot of work ahead of it. If they really have improved the noise performance of th...

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by CowAnon
Mon Jun 21, 2021 9:43 pm
Forum: Civil Aviation
Topic: Washington State Aviation Thread - 2021
Replies: 200
Views: 24465

Re: Washington State Aviation Thread - 2021

Could Snohomish County’s two largest airports be expanded? (Everett Herald, 6/18/2021) A study explores expanding runways at Paine Field and Arlington Municipal to relieve a coming crunch. The article says the PSRC concludes that Paine Field probably can't add new runways but can increase its exist...

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by CowAnon
Mon Jun 21, 2021 8:45 pm
Forum: Travel, Polls & Preferences
Topic: Interesting uses for retired airplanes
Replies: 10
Views: 1449

Interesting uses for retired airplanes

I was reading a news article about Irish wind turbines being recycled as bridges , which led me to think that would be a great use for old planes. Probably only A380s and 747s are wide enough to turn into 2-lane roads, but there will be a ton of retired 737s and A320s lying around to make into cover...

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by CowAnon
Sat Jun 19, 2021 8:24 am
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

^^^I think most people these days consider the presence of a contra-rotating propeller as what separates an open rotor from a turboprop. So the CFM RISE makes things even more confusing, since there's a 2nd propeller, but it doesn't rotate. I agree with your conclusion. === To double back to the 198...

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by CowAnon
Sat Jun 19, 2021 7:52 am
Forum: Technical/Operations
Topic: Jet engines in the 2020s and 2030s.
Replies: 17
Views: 5886

Re: Jet engines in the 2020s and 2030s.

PW might test a GTF engine that increased the bypass ratio from 12 to 18 (FlightGlobal, 6/16/2021). That's more than the RR Ultrafan's BPR of 15. GE/Safran will begin ground and flight testing of an open single rotor/variable-pitch stator combo (CFM RISE) starting in the mid-2020s, but that wouldn'...

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by CowAnon
Tue Jun 15, 2021 11:41 pm
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

So...the target is mid-2030 s EIS...that is 45 years at least after GE announced the UDF for 1990 ..... :spin: https://www.flightglobal.com/engines/cfm-launches-open-rotor-demonstrator-promising-20-better-fuel-burn-for-mid-2030s-applications/144141.article Wonder what new airplane launches on the h...

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by CowAnon
Tue Jun 15, 2021 3:48 am
Forum: Civil Aviation
Topic: GE, Safran announce new airliner engine for the mid 2030s
Replies: 51
Views: 6351

Re: GE, Safran announce new airliner engine for the mid 2030s

Someone please help me with the blade-out requirements for open rotors. I always assumed that open rotors would be certified as propellers, which do not require armor for the case of blade failure. But many posters assume they will be certified as turbo-fans, which do require such armor. Has the FA...

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by CowAnon
Sat Jun 12, 2021 4:42 am
Forum: Non-Aviation
Topic: Latest in the California High Speed Rail Saga: Single-Track Operation
Replies: 138
Views: 8963

Re: Latest in the California High Speed Rail Saga: Single-Track Operation

Biden released money to the CA HSR effort today: Biden restores $929 million for California high-speed rail withheld by Trump And here's another projected US HSR map, from Pedestrian Observations : https://pedestrianobservations.files.wordpress.com/2021/03/hsrbutpretty.png I'd recommend that site as...

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by CowAnon
Sat Jun 12, 2021 3:46 am
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

Higher RPM. That being said, it isn't that much higher. A turboprop prop maxes out under 2000rpm. A turbofan fan spins at around 3000rpm. Not quite that much. The GE36 UDF had a fan blade tip speed of 780 feet per second (238 meters per second) at cruise and 850 fps (259 mps) at takeoff ( UDF desig...

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by CowAnon
Mon Jun 07, 2021 7:52 am
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

Higher RPM. That being said, it isn't that much higher. A turboprop prop maxes out under 2000rpm. A turbofan fan spins at around 3000rpm. Not quite that much. The GE36 UDF had a fan blade tip speed of 780 feet per second (238 meters per second) at cruise and 850 fps (259 mps) at takeoff ( UDF desig...

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by CowAnon
Mon Jun 07, 2021 4:04 am
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

Motors hanging off the horizontal stab make great desktop models. Real planes not so much. Well the An-180 and Clean Sky setup doesn't look as strange as engines embedded in the vertical stabilizer, but ugliness didn't stop their presence on trijet airplanes. This apparently was one of McDonnell Do...

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by CowAnon
Wed Jun 02, 2021 9:46 pm
Forum: Non-Aviation
Topic: Bangladesh GDP per capita higher than India, Pakistan
Replies: 3
Views: 697

Bangladesh GDP per capita higher than India, Pakistan

I didn't know that Bangladesh had made such economic strides in recent years. It's nice to hear about success stories originating from difficult places on the globe (like West Berlin, Hong Kong, Singapore, and South Korea in the 20th century). South Asia Should Pay Attention to Its Standout Star Thi...

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by CowAnon
Wed Jun 02, 2021 8:10 am
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

It's not the first time engines on tailplanes have been proposed - Antonov was going to build the An-180 in the 1990s with a similar configuration (but on the tailplane tips). https://live.staticflickr.com/65535/49505984496_b633742392_b.jpg Antonov An-180 model by Kevin BIETRY `ღ´ ✈ , on Fl...

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by CowAnon
Tue May 25, 2021 12:13 am
Forum: Technical/Operations
Topic: Is the UDF Engine Back from the Dead?
Replies: 33
Views: 7376

Re: Is the UDF Engine Back from the Dead?

^^^Untrue. The UDF was quieter than existing turbofans at the time, which reporters noted when they were able to view or ride test flights. Vibration was experienced but was described as minor. McDonnell Unveils Plane With Revolutionary Engine - Los Angeles Times, 2/4/1988 A major concern early in t...

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by CowAnon
Sat May 22, 2021 3:55 am
Forum: Technical/Operations
Topic: Jet engines in the 2020s and 2030s.
Replies: 17
Views: 5886

Re: Jet engines in the 2020s and 2030s.

P&W. Is there any sign on Pratt on a wide body anytime soon? Apart from 767. What are they doing in house to prepare for the next advance in engine tech? Or are they relying on simply scaling up their gtf for a bigger aircraft? How advanced is the gtf core in comparison to leap or even 9x? Some...

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by CowAnon
Fri May 21, 2021 7:02 pm
Forum: Technical/Operations
Topic: Modern Turbofan Engine Efficiency
Replies: 40
Views: 10108

Re: Modern Turbofan Engine Efficiency

However practical aspects often result in severe compromises to the thermodynamics. For example, decades ago I was part if a large engine design team for an engine not taken up. In the design study, we found the costs skyrocketed for manufacturing the engine above a very specific fan diameter. This...

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by CowAnon
Fri May 14, 2021 12:54 am
Forum: Technical/Operations
Topic: Jet engines in the 2020s and 2030s.
Replies: 17
Views: 5886

Re: Jet engines in the 2020s and 2030s.

Noise, safety, and speed. I don't see how these get resolved with an open rotor. I wouldn't be worried about any of those. Safran's open rotor testing showed that its demonstrator wasn't any louder than its LEAP turbofan. In the late 1980s, GE proposed to MBB (West German contributor to Airbus) an ...

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by CowAnon
Thu May 13, 2021 8:01 pm
Forum: Technical/Operations
Topic: Jet engines in the 2020s and 2030s.
Replies: 17
Views: 5886

Re: Jet engines in the 2020s and 2030s.

Open Rotor. Ever higher turbofan BPR's are going to come with ever diminishing returns until they hit the point where the cowl drag (and weight) is so massive that further gains of any significance in subsonic engine efficiency can only come from open rotor. Noise, safety, and speed. I don't see ho...

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by CowAnon
Thu May 13, 2021 7:33 pm
Forum: Technical/Operations
Topic: Modern Turbofan Engine Efficiency
Replies: 40
Views: 10108

Re: Modern Turbofan Engine Efficiency

Ultrafan was said to be 25% more efficient than the first RR Trent turbofans. That’s since around 1985, typically the improvements have been less than 1% in TSFC over per year. Thanks for that tip. I looked around and found that the Trent 600, which was to go on the McDonnell Douglas MD-11 before t...

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by CowAnon
Thu Apr 22, 2021 4:39 am
Forum: Civil Aviation
Topic: REGENT - Regional Electric Ground Effect Naval Transport
Replies: 7
Views: 1621

REGENT - Regional Electric Ground Effect Naval Transport

This electric WiG concept seems pretty cool, although 180 mph isn't too fast. But I don't see any indication of high-altitude flying capability, so with a Boston-New York route, it would have to go around Cape Cod? Regent is making a flying electric ferry with a top speed of 180 miles per hour (CNBC...

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by CowAnon
Mon Apr 12, 2021 9:24 pm
Forum: Technical/Operations
Topic: Modern Turbofan Engine Efficiency
Replies: 40
Views: 10108

Re: Modern Turbofan Engine Efficiency

Very good summary. Thanks! In jet engines colder air passes over and around a hot engine core. Core temps in jet turbines have increased about 1,000 degrees F since the early turbo jet era. Hence a huge increase in efficiency. That is why the next big breakthroughs in engine tech will be in the mat...

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by CowAnon
Wed Mar 31, 2021 8:44 pm
Forum: Technical/Operations
Topic: Modern Turbofan Engine Efficiency
Replies: 40
Views: 10108

Re: Modern Turbofan Engine Efficiency

@Sokes
I have a feeling you're not "comparing apples to apples" with your efficiency questions, but I don't have an adequate explanation for them, either.

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by CowAnon
Wed Mar 31, 2021 8:22 pm
Forum: Civil Aviation
Topic: RR begins building worlds largest jet engine
Replies: 97
Views: 19883

Re: RR begins building worlds largest jet engine

Is the variable pitch reverse still off the table for now? Correct, the dropping was reported a couple of years ago: https://www.airliners.net/forum/viewtopic.php?t=1415467#p21091165 The Airbus A340 was originally to be powered by an engine called the SuperFan. With the UltraFan, we have come a lon...

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by CowAnon
Wed Mar 31, 2021 6:05 pm
Forum: Travel, Polls & Preferences
Topic: why no metric system in aviation?
Replies: 58
Views: 4985

Re: why no metric system in aviation?

In a similar way, a nautical mile, an international mile, and a survey mile aren't the same distance. So what's the advantage of using the nautical mile? Most people around the world don't have a grasp of the concept of a mile measured on the ground. I don't think they'd know there's a slight diffe...

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by CowAnon
Mon Mar 29, 2021 7:03 pm
Forum: Civil Aviation
Topic: RR begins building worlds largest jet engine
Replies: 97
Views: 19883

Re: RR begins building worlds largest jet engine

Regarding thrust levels, Pratt & Whitney's GTF produces 15,000-33,000 pounds of thrust using gearboxes between 12 and 24 megawatts of capacity (source: Aerospace America , Oct 2018). Extrapolating from 24 to the 50-MW size of the announced Ultrafan demonstrator gives you 69,000 lbs of thrust. Th...

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by CowAnon
Mon Mar 22, 2021 5:54 pm
Forum: Travel, Polls & Preferences
Topic: why no metric system in aviation?
Replies: 58
Views: 4985

Re: why no metric system in aviation?

AFAIK, ex-Soviet countries still use horsepower instead of kilowatts for engine power and kilograms-force (which is metric but not SI) instead of kilonewtons for thrust. I forgot to mention that the PD-14 turbofan for the upcoming Irkut MC-21 aircraft is so named because the engine has a nominal th...

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by CowAnon
Mon Mar 22, 2021 5:36 pm
Forum: Civil Aviation
Topic: Embraer New Turboprop Aircraft News and Discussion Thread
Replies: 490
Views: 67565

Re: Embraer New Turboprop Aircraft News and Discussion Thread

I asked because with real and proposed turboprop/open rotor aircraft, the usual solution to the clearance/heavy landing gear problem is either to change to a high-wing aircraft or to move the engine from the wings to the aft fuselage. I haven't seen engines mounted to the top side of the wing very ...

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by CowAnon
Fri Mar 19, 2021 9:41 pm
Forum: Civil Aviation
Topic: Jet fuel from waste 'dramatically lowers' emissions
Replies: 71
Views: 7822

Re: Jet fuel from waste 'dramatically lowers' emissions

Collecting food waste to make jet fuel would be almost impossible to scale up due to the problem with collecting it and then shipping it to a special refinery. As Mlflyer mentioned landfills already capture that. It's being tried now with diesel fuel in Minnesota (diesel being a similar product to ...

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by CowAnon
Fri Mar 19, 2021 7:29 pm
Forum: Civil Aviation
Topic: Embraer New Turboprop Aircraft News and Discussion Thread
Replies: 490
Views: 67565

Re: Embraer New Turboprop Aircraft News and Discussion Thread

How much of a penalty results from mounting the engines to the top part of the wing, as opposed to the normal location underneath the wing? Is this really a question? To be honest, you asked it initially wrong. Correct would be: How much of a penalty would results from mounting the engines to the n...

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by CowAnon
Thu Mar 18, 2021 9:06 pm
Forum: Civil Aviation
Topic: The case for more aircraft production cuts/playing chicken
Replies: 655
Views: 83190

Re: The case for more aircraft production cuts/playing chicken

mileduets wrote:

Thanks for the info, very illuminating. The second link (about the current night train network) is identical to the first, though.

Also, the night jet trains are not HSR, correct? Is anyone trying to get an overnight HSR network going?

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by CowAnon
Thu Mar 18, 2021 8:20 pm
Forum: Civil Aviation
Topic: Embraer New Turboprop Aircraft News and Discussion Thread
Replies: 490
Views: 67565

Re: Embraer New Turboprop Aircraft News and Discussion Thread

edu2703 wrote:
Image

How much of a penalty results from mounting the engines to the top part of the wing, as opposed to the normal location underneath the wing?

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by CowAnon
Thu Mar 18, 2021 7:34 pm
Forum: Travel, Polls & Preferences
Topic: why no metric system in aviation?
Replies: 58
Views: 4985

Re: why no metric system in aviation?

^^^Because 1 meter per second is about 2.2 miles per hour, just like 1 kilogram is about 2.2 pounds. So that's one less conversion number you need to remember. :cheeky: In the U.S., schools teach people that 1 meter is a little more than 3 feet, but they don't bother to tell us (at least in my schoo...

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by CowAnon
Wed Mar 17, 2021 6:48 pm
Forum: Travel, Polls & Preferences
Topic: why no metric system in aviation?
Replies: 58
Views: 4985

Re: why no metric system in aviation?

AFAIK, ex-Soviet countries still use horsepower instead of kilowatts for engine power and kilograms-force (which is metric but not SI) instead of kilonewtons for thrust.

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