Search found 68 matches

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by CowAnon
Tue Aug 20, 2019 10:41 pm
Forum: Technical/Operations
Topic: Big engines planes (2030+) - how will look like?
Replies: 23
Views: 6561

Re: Big engines planes (2030+) - how will look like?

The other is the Boxprop from Chalmers University of Technology in Sweden (https://www.chalmers.se/SiteCollectionDocuments/M2/Str%C3%B6mningsl%C3%A4ras%20workshop%202k18/1%20LindholmenWorkshop_presentation_20180821_v1.pdf). Pairs of blades in the forward-swept front propeller are attached at their ...

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by CowAnon
Tue Aug 20, 2019 10:17 pm
Forum: Technical/Operations
Topic: Big engines planes (2030+) - how will look like?
Replies: 23
Views: 6561

Re: Big engines planes (2030+) - how will look like?

This one is similar, but two engines: http://zeger.eu/en/portfolio/bwb-passenger-cabin/ However, there is a flaw in the concept above. Using winglets as rudders is a huge safety flaw. This is why all BWBs revert to 3 or 4 engines. The 11-abreast, 80-passenger regional jet version looks cool, but it...

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by CowAnon
Tue Aug 20, 2019 10:11 pm
Forum: Technical/Operations
Topic: Was it possible to build the MAX on 757 Platform instead of 737
Replies: 66
Views: 10916

Re: Was it possible to build the MAX on 757 Platform instead of 737

How much damage to the 757's sales prospects was the result of its 38-meter wingspan not fitting into standard 36-m Code C gates?

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by CowAnon
Fri Aug 16, 2019 9:32 pm
Forum: Civil Aviation
Topic: Rumor: Airbus to launch A350-1000ULR
Replies: 418
Views: 73903

Re: Rumor: Airbus to launch A350-1000ULR

You don't know your history: https://vignette.wikia.nocookie.net/aircraft/images/7/75/7J7_Concept.png/revision/latest?cb=20131022200759 Now did this ever go beyond the drawing board? on par with the sonic cruiser as phantom projects go? ( Was the primary purpose dangling "cooperation" tow...

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by CowAnon
Thu Aug 08, 2019 7:33 am
Forum: Technical/Operations
Topic: Big engines planes (2030+) - how will look like?
Replies: 23
Views: 6561

Re: Big engines planes (2030+) - how will look like?

https://www.safran-group.com/media/safran-celebrates-successful-start-open-rotor-demonstrator-tests-new-open-air-test-rig-southern-france-20171003 Interesting is anywhere more info about this design There was this thread, starting in 2017: https://www.airliners.net/forum/viewtopic.php?f=5&t=137...

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by CowAnon
Tue Jul 30, 2019 7:08 pm
Forum: Technical/Operations
Topic: How will ultrafan seal the variable pitch fan?
Replies: 5
Views: 1855

Re: How will ultrafan seal the variable pitch fan?

http://avstop.com/news_december_2010/ge ... _c130j.htm
-->

Dowty-Rotol is British, and "Rolls-Royce" is actually represented in the name "Rotol", but the company is owned by its competitor General Electric now.

http://avstop.com/news_december_2010/ge ... _c130j.htm

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by CowAnon
Wed Jul 24, 2019 11:38 pm
Forum: Travel, Polls & Preferences
Topic: Your favorite or most fascinating aircraft type..
Replies: 14
Views: 1909

Re: Your favorite or most fascinating aircraft type..

Jet aircraft (all) - Boeing 767 Regional jet - Avro RJ70 Narrow body jet - Douglas DC-8-63 or Boeing 757-300 Wide body jet - Airbus A310 Twinjet - Airbus A318 Trijet - Lockheed L-1011 Tristar Quadjet - Boeing 377 Stratocruiser Propeller aircraft (all) - V-22 Osprey Propeller general aviation - None ...

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by CowAnon
Fri Jul 19, 2019 9:26 pm
Forum: Civil Aviation
Topic: MC-21 Development Thread
Replies: 439
Views: 124123

Re: MC-21 Development Thread

… At the MAKS-2015 international air show held at Zhukovsky International Airport ( ZIA ) it was already possible to see the prototype of a wide-chord fan blade made of carbon fiber, created in CIAM, the mass of which is 65 % of the mass of the hollow titanium blade used now. At the CIAM booth, one...

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by CowAnon
Wed Jul 17, 2019 1:14 am
Forum: Travel, Polls & Preferences
Topic: Top 10 biggest failures in commercial aviation?
Replies: 47
Views: 2501

Re: Top 10 biggest failures in commercial aviation?

The MD-90 had received 328 orders and options three months after its November 1989 launch. What happened to cause it to end up with only 116 aircraft deliveries?

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by CowAnon
Mon Jul 01, 2019 7:34 am
Forum: Technical/Operations
Topic: Fuel efficiency vs Noise reduction
Replies: 9
Views: 1645

Re: Fuel efficiency vs Noise reduction

Thats what I'm getting at. Chevrons on the 787 was a surprising example of prioritising noise suppression over fuel consumption. That case is especially strange considering the engines were probably also within current noise regulations without the chevrons.... And although yes it is correct to say...

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by CowAnon
Mon Jun 24, 2019 8:43 am
Forum: Technical/Operations
Topic: Big engines planes (2030+) - how will look like?
Replies: 23
Views: 6561

Re: Big engines planes (2030+) - how will look like?

About md80 udf- it was geared or not? The General Electric GE36 UDF that flew on the Boeing 727 and the MD-80 was gearless. The lesser-known Pratt & Whitney/Allison 578-DX propfan was geared, and it flew briefly on the MD-80 after the UDF flight testing had completed. First UDF flight footage o...

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by CowAnon
Sat Jun 22, 2019 8:12 am
Forum: Technical/Operations
Topic: Big engines planes (2030+) - how will look like?
Replies: 23
Views: 6561

Re: Big engines planes (2030+) - how will look like?

1) common planes with very big engines. 1a) will it be DC-9 style return? https://dynaimage.cdn.cnn.com/cnn/q_auto,w_634,c_fill,g_auto,h_357,ar_16:9/http%3A%2F%2Fcdn.cnn.com%2Fcnnnext%2Fdam%2Fassets%2F171005175920-cnnee-portafolio-zunum.jpg (i dont hink V-tail useful for pax) or 1b) just A380-style...

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by CowAnon
Wed May 29, 2019 6:31 pm
Forum: Technical/Operations
Topic: What is the dynamics or reason behind the turboprops rotating blades in opposite directions?
Replies: 22
Views: 4597

Re: What is the dynamics or reason behind the turboprops rotating blades in opposite directions?

For the Kuznetsov NK-12 engine that runs on the Tu-95 and An-22, I'm guessing that the contra-rotating fans have an equal split of power between the front and back propellers. The Progress D-27 engine has the front propeller absorbing more of the power than the back propeller, though -- a 59/41 perc...

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by CowAnon
Fri May 24, 2019 7:22 am
Forum: Travel, Polls & Preferences
Topic: Why didn't McDonnell-Douglas get bailed out?
Replies: 17
Views: 2247

Re: Why didn't McDonnell-Douglas get bailed out?

I see everyone saying how MDC was in bad shape and they had to get bought or go bankrupt. I wonder about this too. I'd thought the same, but the late-1994 NY Times article I posted said that they were going to spend $2.5 billion on share buybacks, on top of the 71% dividend hike. Would those amount...

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by CowAnon
Thu May 23, 2019 5:47 pm
Forum: Travel, Polls & Preferences
Topic: Why didn't McDonnell-Douglas get bailed out?
Replies: 17
Views: 2247

Re: Why didn't McDonnell-Douglas get bailed out?

Does this sound like a company that needed to be bailed out? McDonnell Dividend To Jump 71% (New York Times, 10/29/1994) Flush with cash, McDonnell Douglas has decided to spend a bit on stockholders. It announced yesterday that it would repurchase 18 million shares, split the stock 3 for 1 and incre...

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by CowAnon
Mon May 13, 2019 7:28 am
Forum: Military Aviation & Space Flight
Topic: New Antonov AN-132 transport unveiled (photos)
Replies: 33
Views: 11196

Re: New Antonov AN-132 transport unveiled (photos)

Ukraine can’t catch a break at the moment. Apparently the suspension is due to Saudi Arabia improving relations with Russia. Anyone have any ideas on potential new partners for Antonov for co-development? Before the C-295 announcement I would have said India was a possibility but likely not now. Uk...

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by CowAnon
Mon May 13, 2019 7:05 am
Forum: Civil Aviation
Topic: Boeing NMA planning - Will Airbus just sitting on their hands?
Replies: 91
Views: 14330

Re: MAX impact on Boeing NMA planning, Airbus just sitting on their hands?

https://www.aerotime.aero/upload/files/1140x420/Roll_Royce_gearbox_crop.jpg Picture Rolls Rolls Ultrafan gearbox. https://www.aerotime.aero/yulius.yoma/14877-rolls-royce-runs-world-s-most-powerful-aerospace-gearbox Off-topic, but why does Rolls-Royce need a gearbox of that size? Isn't 100,000 horse...

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by CowAnon
Sat Apr 27, 2019 6:50 am
Forum: Civil Aviation
Topic: Boeing 737 replacement, back on the table in summer 2019?
Replies: 354
Views: 68874

Re: Boeing 737 replacement, back on the table in summer 2019?

Where's the inflection point between single aisle and twin aisle? Maybe there is no logic for 2-3-2 ever. But maybe there is no logic for 2-4-2 either. Just go from 40 rows of 3-3 at 240, to 27 rows of 3-3-3 at 243. But I personally think there is a great case for twin aisle at anything above 180 p...

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by CowAnon
Fri Apr 26, 2019 10:34 pm
Forum: Civil Aviation
Topic: Boeing 737 replacement, back on the table in summer 2019?
Replies: 354
Views: 68874

Re: Boeing 737 replacement, back on the table in summer 2019?

Where's the inflection point between single aisle and twin aisle? Maybe there is no logic for 2-3-2 ever. But maybe there is no logic for 2-4-2 either. Just go from 40 rows of 3-3 at 240, to 27 rows of 3-3-3 at 243. But I personally think there is a great case for twin aisle at anything above 180 p...

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by CowAnon
Thu Apr 18, 2019 7:02 pm
Forum: Civil Aviation
Topic: Boeing 737 replacement, back on the table in summer 2019?
Replies: 354
Views: 68874

Re: Boeing 737 replacement, back on the table in summer 2019?

Boeing erred in not building the 7J7. McDonnell Douglas would have followed with UDF-powered MD-80 derivatives, and the reliability/maintenance bugs of the new engines would have been ironed out by the time fuel prices shot up in the 2000s. Airbus would have been forced to phase out the A320 and com...

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by CowAnon
Thu Mar 21, 2019 7:49 am
Forum: Civil Aviation
Topic: Regional Props VS Regional Jets
Replies: 50
Views: 6590

Re: Regional Props VS Regional Jets

But I think this is all a bit theoretical, as I guess the chances that we have long haul prop traffic returning are close to zero, even though there might be a tiny niche market for low cost carriers (A400 pax version?). I think there would be a huge amount of people who could take the time penalty...

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by CowAnon
Fri Mar 15, 2019 8:30 pm
Forum: Technical/Operations
Topic: Why is the A330 still 8 abreast?
Replies: 26
Views: 3931

Re: Why is the A330 still 8 abreast?

The main reason the A330 is still eight-abreast is to go nine-abreast makes the seats and aisles are around 16.5" wide and that is considered a no-go for most non-charter operators, especially for longer missions. From https://leehamnews.com/2018/11/06/airbus-a330-800-first-flight/: Airbus is ...

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by CowAnon
Fri Mar 15, 2019 8:00 pm
Forum: Civil Aviation
Topic: The folding wings of the B777-9
Replies: 92
Views: 18466

Re: The folding wings of the B777-9

And why are they a let down? We always knew what size they would be. They fold and do their job. What did people expect?? I'm guessing it's the aesthetics for the person who made that comment. Considering that two of Boeing's concepts ( Pelican and Truss-Braced Wing ) can reduce their parked wingsp...

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by CowAnon
Mon Feb 11, 2019 8:37 am
Forum: Civil Aviation
Topic: QF officially cancels final 8 A380s.
Replies: 217
Views: 37636

Re: QF officially cancels final 8 A380s.

GLARE is a good material, with some great properties, Aluminum skins sandwiching even a foam would be excellent for leading edges to address bird strikes and similar impacts. It still requires mounting using fasteners and is primarily for single direction curve panels. It is reported to have great ...

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by CowAnon
Tue Jan 15, 2019 6:35 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 27194

Re: Boeing unveils new version of radical wing design

The big bit missing imho is what a conventional 'new' NSA could do ( be)? Ie how far could an conventional low wing carbon fibre folding wing be stretched ( aspect ratio) without needing to go 'high wing and struts '.What would the performance differential be I wonder? Aviation Week discussed this ...

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by CowAnon
Mon Jan 14, 2019 8:46 pm
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 27194

Re: Boeing unveils new version of radical wing design

Note that the A320 wing is span limited to fit into the needed gates. A modern wing would have more span. Sure, but with Boeing being comfortable reducing on-ground wingspan by about 1/3 through folding wings, maybe the OEMs would be tempted to apply folding wingtips to their existing wings without...

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by CowAnon
Sat Dec 29, 2018 9:13 pm
Forum: Civil Aviation
Topic: Would a B-52 passenger variant have been possible?
Replies: 95
Views: 13947

Re: Would a B-52 passenger variant have been possible?

Returning to the original question of the B-52, there's also the question of the landing gear: would the tandem bogies with outriggers arrangement have been suitable, or would a more conventional arrangement have been necessary? If the latter, then perhaps the wings would needed to have been redesi...

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by CowAnon
Wed Dec 26, 2018 8:19 pm
Forum: Civil Aviation
Topic: The Boeing Pelican ULTRA
Replies: 9
Views: 3723

Re: The Boeing Pelican ULTRA

TsAGI's Heavy Cargo Aircraft with Lifting Body (HCA-LB) seems to be the most similar to the Boeing Pelican among current proposals. ⋅  Russian blended wing aircraft concept keeps on the down low (February 1, 2017) ⋅  Containerized air freight system powered by cryogenic fuel (Sep...

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by CowAnon
Tue Dec 18, 2018 12:57 am
Forum: Technical/Operations
Topic: Shape of fuselage
Replies: 60
Views: 7439

Re: Shape of fuselage

Slightly off-topic, but I was surprised to learn that composite materials are better more likely to be applied to unpressurized fuselages. Dealing with the pressurization cycles would seem to tip the scales toward composites on pressurized fuselages, but at least one person disagrees. https://www.co...

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by CowAnon
Fri Dec 07, 2018 11:50 pm
Forum: Civil Aviation
Topic: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..
Replies: 211
Views: 28118

Re: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..

Nothing. It's one of the best fuselages on the market and definitely the best narrow fuselage in existence. Eh - Airbus wouldn't be working on other fuselage materials and manufacturing methods if it didn't think it had something to gain. https://www.compositesworld.com/articles/fiber-metal-laminat...

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by CowAnon
Thu Dec 06, 2018 7:29 pm
Forum: Civil Aviation
Topic: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..
Replies: 211
Views: 28118

Re: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..

I wonder if a new fuselage for an A320 replacement would provide enough improvement to justify the expense. What would it bring that the current fuselage can't. Nothing. It's one of the best fuselages on the market and definitely the best narrow fuselage in existence. Eh - Airbus wouldn't be workin...

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by CowAnon
Thu Dec 06, 2018 1:25 am
Forum: Civil Aviation
Topic: Why hasn’t plane design changed much?
Replies: 150
Views: 14989

Re: Why hasn’t plane design changed much?

That suggests that whilst we stick with high bypass turbines ... little will change as we already have the optimum design.However if you move to open rotor ... then the design changes radically. How so? Will an open rotor require dramatically more space than a modern high-bypass fan? Yes. The turbo...

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by CowAnon
Sat Nov 24, 2018 6:41 am
Forum: Technical/Operations
Topic: Aircraft Tire Brand Options
Replies: 24
Views: 2652

Re: Aircraft Tire Brand Options

...somehow I forgot to mention that Goodyear doesn't even make a 1400x530R23 tire model. But my main point is the same - Goodyear doesn't appear to produce tires that can be used on some of the Airbus widebodies, though it seems like that would be easy for Goodyear to do. Aircraft tires require FAA ...

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by CowAnon
Sat Nov 24, 2018 4:47 am
Forum: Technical/Operations
Topic: Aircraft Tire Brand Options
Replies: 24
Views: 2652

Re: Aircraft Tire Brand Options

The A330, A340, A350, and A380 all use 1400x530R23 for their main gear tires, but with different ply ratings (from 32/36 for the A330 up to 42 for the A350). Minor correction - the A350-900 does use 1400x530R23, but the Michelin catalog lists the main gear tires for the A350-1000 as 50X20.0R22. As ...

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by CowAnon
Tue Nov 20, 2018 6:32 pm
Forum: Technical/Operations
Topic: Aircraft Tire Brand Options
Replies: 24
Views: 2652

Re: Aircraft Tire Brand Options

Tire trivia The 767-400 uses exactly the same main gear tires as the 777 Just less of them ! Really? Wow, this topic is actually a lot more interesting than I initially thought. I have even more questions now. We know the usual automobile tires designation of, for example, 225/35R18. How are aircra...

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by CowAnon
Sat Oct 13, 2018 7:41 pm
Forum: Site Related
Topic: Posted links are not formatted when in print view
Replies: 0
Views: 2679

Posted links are not formatted when in print view

When I read a topic in Print view, any hyperlinks that are posted by users do not appear with any special type of formatting, unless the poster added the formatting manually. The lack of formatting makes it hard to know when text has a destination link, especially if the link text is not the URL its...

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by CowAnon
Sat Oct 13, 2018 7:23 pm
Forum: Technical/Operations
Topic: How efficient can a jet engine get in the future ?
Replies: 19
Views: 3148

Re: How efficient can a jet engine get in the future ?

Does anyone know what the fuel energy ratio Efficiency is on the jet engine with the best fuel economy is ? Looks like about 71-72 percent propulsive efficiency, 39-40 percent overall efficiency for the Airbus 350 and Boeing 787. https://www.nap.edu/openbook/23490/xhtml/images/p-51-1.jpg There are ...

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by CowAnon
Thu Oct 11, 2018 6:32 am
Forum: Technical/Operations
Topic: How efficient can a jet engine get in the future ?
Replies: 19
Views: 3148

Re: How efficient can a jet engine get in the future ?

Nice graph CowAnon Thanks You're welcome. :) Does anyone know what the next leap in propulsion systems could possibly be? https://aerospaceamerica.aiaa.org/features/high-gear/ For geared turbofans, the upper limit of efficiency will probably be bypass ratios of 15:1 or 16:1, says Jean-François Brou...

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by CowAnon
Tue Sep 25, 2018 3:09 am
Forum: Technical/Operations
Topic: How efficient can a jet engine get in the future ?
Replies: 19
Views: 3148

Re: How efficient can a jet engine get in the future ?

Does anyone know what the fuel energy ratio Efficiency is on the jet engine with the best fuel economy is ? Looks like about 71-72 percent propulsive efficiency, 39-40 percent overall efficiency for the Airbus 350 and Boeing 787. https://www.nap.edu/openbook/23490/xhtml/images/p-51-1.jpg There are ...

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by CowAnon
Fri Aug 31, 2018 7:14 pm
Forum: Technical/Operations
Topic: Safran inaugurates open rotor test program
Replies: 27
Views: 9192

Re: Safran inaugurates open rotor test program

Aerospace America asked the Safran research and technology VP about the open rotor project in last month's issue: Bird strike test We have composite blades — the way the propeller blade cracks is different from a metallic blade. These blades are more robust than metallic blades. We can imagine a dif...

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by CowAnon
Thu Aug 09, 2018 7:20 pm
Forum: Civil Aviation
Topic: Washington State Air Service Discussion 2018
Replies: 520
Views: 49495

Re: Washington State Air Service Discussion 2018

Another update from the Everett Herald. The Paine Field terminal will be ready in October, while flights may start later this year or early 2019, depending on what the FAA decides (report to be released next month or October): https://www.heraldnet.com/business/faa-could-release-new-passenger-servic...

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by CowAnon
Thu Aug 09, 2018 6:37 pm
Forum: Civil Aviation
Topic: MC-21 Development Thread
Replies: 439
Views: 124123

Re: MC-21 Development Thread

This month's Composites World magazine has a detailed article about the OOA manufacturing process for the MC-21 wing: Infused wing sheds light on aerocomposites future: In the Irkut MS-21 infused and co-cured wings, the aerocomposites industry gets a glimpse of how out-of-autoclave technologies migh...

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by CowAnon
Sun Aug 05, 2018 11:56 pm
Forum: Technical/Operations
Topic: Aircraft length and the ICAO aerodrome reference codes
Replies: 0
Views: 470

Aircraft length and the ICAO aerodrome reference codes

I keep reading about the 80 Meter Box standard that prevents the A380 and other large aircraft from going beyond 80 meters in length and width, but AFAICS the ICAO Aerodrome Reference Code behind that rule only refers to wingspan. Is it that much of a problem for airports if the A380, B777, or A350 ...

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by CowAnon
Mon Jul 30, 2018 8:40 pm
Forum: Travel, Polls & Preferences
Topic: Innovations in boarding???
Replies: 71
Views: 6103

Re: Innovations in boarding???

It would be nice to have some miracle way to have one column of seats (say, the "C" seats on a six-across NB) drop into the floor so that the aisle is twice as wide during boarding. Then if you are in a "C" seat, you board last and pop the seat up once onboard. But that' probabl...

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by CowAnon
Sat Jul 14, 2018 7:46 pm
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3491
Views: 430768

Re: Boeing 797 Discussion Thread - 2018

That said I expect the NMA to be a composite fuselage. The NSA is the tricky one. If composites do come close they may replace aluminum. Boeing has to keep in mind that this will be a thirty year investment and the projected trend of composites vs metals will play into that decision. Still that dec...

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by CowAnon
Sat Jul 14, 2018 7:27 pm
Forum: Technical/Operations
Topic: Would a large prop plane designed today look the same?
Replies: 21
Views: 4051

Re: Would a large prop plane designed today look the same?

because the lack of speed compared to other narrowbodies seems to be one of the reasons why there aren't more turboprops in the sky. I don't think that short- / medium-haul airlines give one moment's consideration to speed, other than when planning block-time and crewing. What they really want is c...

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by CowAnon
Thu Jul 05, 2018 11:15 pm
Forum: Civil Aviation
Topic: The Boeing Pelican ULTRA
Replies: 9
Views: 3723

Re: The Boeing Pelican ULTRA

It appears there's been nothing new since the middle of the last decade. :( Someone's probably had this thought before, but it would be nice if an airplane OEM used a pie-in-the-sky concept like this in their production system. Maybe after building a handful for lugging fuselage/wing parts to their ...

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by CowAnon
Thu Jul 05, 2018 10:10 pm
Forum: Technical/Operations
Topic: Would a large prop plane designed today look the same?
Replies: 21
Views: 4051

Re: Would a large prop plane designed today look the same?

A modern large prop aircraft would have to (and is able to) at least match current narrowbody levels of speed (Mach 0.78), so the wings wouldn't appear very different from those on a B737 or A320. The engines would probably have to be mounted near the back of the fuselage instead of on the wings, w...

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by CowAnon
Fri Jun 15, 2018 11:37 pm
Forum: Civil Aviation
Topic: Will Boeing build its new mid-market aircraft in Washington?
Replies: 119
Views: 10300

Re: Will Boeing build its new mid-market aircraft in Washington?

Here's a reminder that Everett and Renton aren't the only places in Washington that could host 797 assembly. Lower-cost Moses Lake in central Washington currently provides Boeing airplane testing and will try to add an FAL to its facilities. The Port of Moses Lake has long had plans simmering for an...

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by CowAnon
Wed Jun 06, 2018 7:44 pm
Forum: Technical/Operations
Topic: Would a large prop plane designed today look the same?
Replies: 21
Views: 4051

Re: Would a large prop plane designed today look the same?

A modern large prop aircraft would have to (and is able to) at least match current narrowbody levels of speed (Mach 0.78), so the wings wouldn't appear very different from those on a B737 or A320. The engines would probably have to be mounted near the back of the fuselage instead of on the wings, wh...

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