Search found 759 matches

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by kitplane01
Tue Apr 17, 2018 12:16 am
Forum: Civil Aviation
Topic: Global 7000 range better than expected at 7700 nm
Replies: 27
Views: 3963

Re: Global 7000 range better than expected at 7700 nm

How does the Global compare with the G-650? Anyone have a feel for which is the preferred platform going forward? The G650 is much more attractive, and probably has a better support network, and is produced by a company with a reputation for management success. But the Global 7000 stats look better....

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by kitplane01
Sat Apr 14, 2018 4:31 am
Forum: Civil Aviation
Topic: Air India Privatization, by June-decision?
Replies: 239
Views: 19468

Re: Air India Privatization, by June-decision?

So, here's a genuine question, what is the difference between Indian travellers and Chinese travellers China has a gdp per capita of about $8000. India is under $2000. (Wikipedia). China is closer to the US than India. I assume that the result is MANY more Chinese than Indians coming to the US. But...

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by kitplane01
Sat Apr 14, 2018 4:22 am
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

keesje wrote:
RJMAZ, if one would replace the 787 centerwingbox, wings, landing gear, engines


That’s a new plane.

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by kitplane01
Sat Apr 14, 2018 4:13 am
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

I think what you wrote is interesting. But if you were to reduce the take off weight of a 787 by 10%, that would imply a 10% reduction in takeoff thrust. I think every engine manufacturer would just do a paper derate. Are derated engines bad (besides the extra weight)? Do they use more fuel per pou...

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by kitplane01
Fri Apr 13, 2018 4:11 am
Forum: Civil Aviation
Topic: Airbus shelves A320neo-plus study
Replies: 241
Views: 26176

Re: Airbus shelves A320neo-plus study

So now we know that Boeing will not be doing the 797....Airbus inside sources have confirmed that Boeing cannot make a business case so it is pointless for Airbus to continue the study, the A321 will reign supreme for another 10 years or so while the MAX10 brings up the rear. Cool..... Option 1) Th...

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by kitplane01
Fri Apr 13, 2018 4:07 am
Forum: Civil Aviation
Topic: Air India Privatization, by June-decision?
Replies: 239
Views: 19468

Re: Air India Privatization, by June-decision?

Looks like the bid might be sweetened with a further 3,500 crore reduction in debt. http://www.financialexpress.com/infrastructure/airlines-aviation/air-india-sale-government-may-assume-more-liabilities/1130074/lite/ It is better to save the sale now than later. My opinion:. The sale is just too bi...

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by kitplane01
Fri Apr 13, 2018 3:52 am
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

Why do you think no one has ever done this? They could not see the profit? They didn't think of it? It comes down to engines. Engine thrust growth and small fuel efficiency improvement means that every family shifts to the right. With an even spread of aircraft 737/757/767/777/747 the smaller aircr...

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by kitplane01
Thu Apr 12, 2018 8:39 pm
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

[So again, can you find any time in the last 50 years that any commercial airliner did what you want: take an existing plane and remove 10%-20% of it's weight? I don't think it's happened, and to me that's evidence that it's really hard to do. The 777-200LR is heavier than the 777-200. The 777-200 ...

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by kitplane01
Thu Apr 12, 2018 7:54 am
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

They will have that time in any case, Airbus can´t sell more A320 familiy members, regardless of how good they make it. Even if they could magically lower trip costs by 5%, availability would still mean that the Max sales numbers won´t change, unless Airbus gets so bold to ramp up production well b...

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by kitplane01
Thu Apr 12, 2018 7:48 am
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

I'm just going to point out that the A300 and the A330 are very different airplanes. You could not start with either, make a few changes, and have the other. I'm guessing they have very few common parts. Actually the fuselage tube and tail are identical you've got upwards of 75+% commonality in the...

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by kitplane01
Tue Apr 10, 2018 11:30 pm
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

The 787-8 empty weight can easily be dropped from 120T to 110T and with a bit of extra cost and more unique optimised parts could probably hit 100T empty. A slightly shorter fuselage is also relatively easy. er. I might create a big post with a part by part breakdown of the optimisation process. If...

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by kitplane01
Tue Apr 10, 2018 11:21 pm
Forum: Civil Aviation
Topic: American Airlines orders 47 additional 787's (22 788's and 25 789's), cancels A350 order
Replies: 554
Views: 69460

Re: American Airlines orders 47 additional 787's (22 788's and 25 789's), cancels A350 order

You both seem to be assuming that fitting 787-9 components onto the -8 will add weight. But that's not obvious. The 787-9 was designed after the -8, and using the lessons learned from the -8. It could be the -9 parts are simply better (lighter weight, cost less, lower maintenance, etc.) I will agre...

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by kitplane01
Tue Apr 10, 2018 4:40 am
Forum: Technical/Operations
Topic: Propeller Question
Replies: 3
Views: 1220

Re: Propeller Question

The quick answer is called "minimum induced loss" - a fancy term for describing what type of mission the propeller is to perform. On a 172, with a minimally powered engine, the tapered ends allow a more evenly distributed elliptical distribution of the induce loss. Higher performance engi...

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by kitplane01
Tue Apr 10, 2018 4:29 am
Forum: Civil Aviation
Topic: Is Boeing outfoxing Airbus?
Replies: 114
Views: 19629

Re: Is Boeing outfoxing Airbus?

The 787-8 empty weight can easily be dropped from 120T to 110T and with a bit of extra cost and more unique optimised parts could probably hit 100T empty. A slightly shorter fuselage is also relatively easy. er. I might create a big post with a part by part breakdown of the optimisation process. If...

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by kitplane01
Tue Apr 10, 2018 4:25 am
Forum: Civil Aviation
Topic: American Airlines orders 47 additional 787's (22 788's and 25 789's), cancels A350 order
Replies: 554
Views: 69460

Re: American Airlines orders 47 additional 787's (22 788's and 25 789's), cancels A350 order

On another thread we have one member campaigning for an ultra-weight-reduced 787-8 to target the MoM space. Now we have a campaign for a heavier 787-8 to target the traditional carrier role. End result: I have a headache. I have noticed this too. There is a group of people on A.net that think the 7...

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by kitplane01
Mon Apr 09, 2018 6:02 am
Forum: Civil Aviation
Topic: American Airlines orders 47 additional 787's (22 788's and 25 789's), cancels A350 order
Replies: 554
Views: 69460

Re: AA ORDERS 47 787 FROM BOEING????

Strato2 wrote:
bigjku wrote:
The 8 is getting the 9’s tail.


That's only going to make the hole bigger for Boeing to dig themselves out. They truly need all these orders.


Why do you think this. The move was made to reduce construction costs, which sounds like a good thing to me.

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by kitplane01
Fri Apr 06, 2018 5:32 am
Forum: Civil Aviation
Topic: Air India Privatization, by June-decision?
Replies: 239
Views: 19468

Re: Air India Privatization by June-decision

... I cannot determine the business case for the current terms of AI. I do believe anyone can make a profit. ... The terms are poor and they walked away. Lightsaber I see you keep repeating "terms are poor" without any explanation. Care to explain? The 33,000Cr debt buyer gets along with ...

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by kitplane01
Wed Apr 04, 2018 5:04 pm
Forum: Civil Aviation
Topic: NetJets Fleet
Replies: 15
Views: 3076

Re: NetJets Fleet

As a photographer at one of NetJets hubs - PBI - I have numerous photos of their aircraft. Just take a look at PBI photos and you will see everything from their Gulfstreams and Challengers to their Sovereigns and Phenoms. What is a netjets hub? They don't have a regular route structure, and they do...

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by kitplane01
Wed Apr 04, 2018 3:25 am
Forum: Civil Aviation
Topic: A343 and A346 Status?
Replies: 50
Views: 7937

Re: A343 and A346 Status?

I don't think that the Airbus 340 is that less fuel efficient than many of todays aircraft. What a weird thing to write! Why do you think this thing? Everyone else thinks the A340 burns more fuel than the 777, it's only real competitor. Here is one source ... there are lots more. https://www.flight...

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by kitplane01
Wed Apr 04, 2018 3:13 am
Forum: Technical/Operations
Topic: GFRP vs CFRP
Replies: 14
Views: 1642

GFRP vs CFRP

lightsaber wrote:
Next generation:
1. GFRP wings (not CFRP).


Can someone comment on how much better GFRP is as an aircraft construction material than CFRP? Wikipedia does not help much.

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by kitplane01
Sun Mar 25, 2018 3:17 am
Forum: Travel, Polls & Preferences
Topic: 773ER vs A346 for private use (yes, another A340 post)
Replies: 11
Views: 1529

Re: 773ER vs A346 for private use (yes, another A340 post)

If I am hypothetically flying myself, then based on what I should do, I should get a 773ER instead of an A346. Because even though I love the A343 and A346: 1. They are gas guzzlers 2. They have 4 engines, which has its pros but also has increased maintenance costs 3. The Trent 500's are out of pro...

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by kitplane01
Sun Mar 18, 2018 5:41 am
Forum: Technical/Operations
Topic: Why so few high wing airliners?
Replies: 28
Views: 4135

Re: Why so few high wing airliners?

I don't know the aerodynamic reasons, but high wing planes tend to have great takeoff performance but are slow at cruise. Not sure why, but it appears to be true. I believe this is related to the wing-body join and air flow patterns on the wing. High wing aircraft have additional turbulence on the ...

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by kitplane01
Sun Mar 18, 2018 5:40 am
Forum: Technical/Operations
Topic: Why so few high wing airliners?
Replies: 28
Views: 4135

Re: Why so few high wing airliners?

This is something that I have wondered about. Maybe the question might be better expanded to avoid the A vs B debate. Why are the most popular short-haul turboprops often high wing if low wing is so much better? Q400 (and its predessors), and ATR are highwing. Is there a reason that on a turboprop ...

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by kitplane01
Sun Mar 18, 2018 5:34 am
Forum: Technical/Operations
Topic: Why so few high wing airliners?
Replies: 28
Views: 4135

Re: Why so few high wing airliners?

This is something that I have wondered about. Maybe the question might be better expanded to avoid the A vs B debate. Why are the most popular short-haul turboprops often high wing if low wing is so much better? Q400 (and its predessors), and ATR are highwing. Is there a reason that on a turboprop ...

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by kitplane01
Fri Mar 16, 2018 11:19 pm
Forum: Technical/Operations
Topic: Cargo Fuel Tanks and Software
Replies: 7
Views: 761

Re: Cargo Fuel Tanks and Software

Aux (lowerdeck) cargo fuel tanks can be added into an aircraft with a STC. In older (analoque) aircraft an additional aux fuel panel was added and integrated into the fuel system.(extra piping,wiring and pumps, if required.) The W&B was calculated with the additional fuel at one or more cargo p...

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by kitplane01
Fri Mar 16, 2018 5:57 am
Forum: Technical/Operations
Topic: Cargo Fuel Tanks and Software
Replies: 7
Views: 761

Cargo Fuel Tanks and Software

Lots of planes can carry fuel in extra tanks in the cargo bay. But how does that integrate with the software that flys the plane. Modern planes display endurance until empty and center of gravity. Does one get a software upgrade with the extra tankage?

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by kitplane01
Fri Mar 16, 2018 5:55 am
Forum: Technical/Operations
Topic: Next important technology?
Replies: 47
Views: 2737

Re: Next important technology?

The critical element for sizing jet engines isn’t take-off performance on the runway, it’s climb performance, specifically engine-out second segment performance and cruise thrust at optimum flight level at initial level-off after gross weight take-off. Adding electric motors for the roll would incr...

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by kitplane01
Wed Mar 14, 2018 6:04 pm
Forum: Civil Aviation
Topic: Textron launches Beech 1900-sized SkyCourier with FedEx order
Replies: 196
Views: 40773

Re: Textron launches Beech 1900-sized SkyCourier with FedEx order

Twelve 3D-printed parts replaces 855 parts: frames, combustor liners, sumps, exhaust case, bearing housings, stationary components in the flowpath, and heat exchangers. Overall weight is reduced by 5% and brake specific fuel consumption is improved by 1%. 3D printing is not used for rotating compon...

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by kitplane01
Tue Mar 13, 2018 11:23 pm
Forum: Civil Aviation
Topic: 10 Air France unions plans strike
Replies: 99
Views: 12120

Re: 10 Air France unions plans strike

Usually long haul flights were the least affected during strikes, however a court challenge has been lost so now AF can't do the same shuffling around of crews they were doing before. Can you explain this? The court has ordered certain pilots to crew particular aircraft, overriding the crew assignm...

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by kitplane01
Tue Mar 13, 2018 5:58 am
Forum: Technical/Operations
Topic: Turbofan engine Growth
Replies: 16
Views: 2299

Re: Turbofan engine Growth

When an engine is made smaller they can often do the opposite remove the first low pressure compressor stage to reduce the core size. You can see this on the E-175 and MRJ geared turbofans. Why would your prefer to remove the *first* low pressure compressor stage? I would think that by removing tha...

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by kitplane01
Mon Mar 12, 2018 5:12 pm
Forum: Civil Aviation
Topic: A380 at PHX or SJU, can it be done? How likely that it be done?
Replies: 12
Views: 2100

Re: A380 at PHX or SJU, can it be done? How likely that it be done?

I had a conversation a few years ago with a local PHX airport worker at my church, he told me we'd never see an A380 in PHX and then the Qantas flight came on a medical emergency so it's technically possible at least... He meant PHX would never see a scheduled A380, and he was right. PHX is equippe...

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by kitplane01
Sun Mar 11, 2018 4:47 am
Forum: Technical/Operations
Topic: Engine requirement criteria
Replies: 6
Views: 491

Re: Engine requirement criteria

Not absolutely sure what you are asking, but this thread may be helpful. https://www.pprune.org/tech-log/433331-thrust-selection-after-engine-failure-fire-takeoff.html More good stuff. https://www.pprune.org/tech-log/282945-calculating-thrust-altitude.html That was helpful. The pprune link says tha...

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by kitplane01
Sat Mar 10, 2018 11:51 pm
Forum: Technical/Operations
Topic: Engine requirement criteria
Replies: 6
Views: 491

Re: Engine requirement criteria

Wow. Lightsabre, I'm sure everything you said is true. However the poster, I believe, is just asking what thrust available requirements are the most stringent in a certified airliner. To me and stratclub, that would be the requirement to have enough thrust available on its remaining engines at a T/...

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by kitplane01
Sat Mar 10, 2018 7:05 pm
Forum: Technical/Operations
Topic: Engine requirement criteria
Replies: 6
Views: 491

Engine requirement criteria

It seems engine size might be set by one of three criteria 1) Thrust needed for takeoff 2) Thrust needed at top of climb 3) Thrust needed for engine out Obviously different planes are different. But for 737-777 type aircraft, what is the most critical? People on the forum seem to assume it’s #3, but...

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by kitplane01
Fri Mar 09, 2018 10:40 pm
Forum: Technical/Operations
Topic: Next important technology?
Replies: 47
Views: 2737

Re: Next important technology?

Recently we have seen the widespread adoption of carbon fiber and geared turbofans. We are about to see folding wingtips. New Chance for Fiber-Metal-Laminates (7/31/2016 - see bottom of page): In order to meet Airbus’ announced production target of 60+ aircraft/month, Premium AEROTEC established a ...

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by kitplane01
Tue Mar 06, 2018 9:27 am
Forum: Technical/Operations
Topic: Next important technology?
Replies: 47
Views: 2737

Re: Next important technology?

I could see more research going into replacing APU's with fuel cells. I remeber Airbus retrofitted the 1986 A320 prototype with an experimental fuel cell system - can't remember what came of it. Sadly, the Millennial generation in the west cares more about apps and shiny "bling" sh** to c...

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by kitplane01
Tue Mar 06, 2018 2:16 am
Forum: Military Aviation & Space Flight
Topic: What’s next for the C130 ?
Replies: 18
Views: 2495

Re: What’s next for the C130 ?

https://www.google.com/amp/s/www.milita ... y-2024/amp
-->

The military HHS’s said explicitly they may want a c-130 sized quad copter. So tgat would reduce the incentive for Lockheed to invest in the c-130 or anything like it.

https://www.google.com/amp/s/www.milita ... y-2024/amp

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by kitplane01
Tue Mar 06, 2018 2:02 am
Forum: Technical/Operations
Topic: Next important technology?
Replies: 47
Views: 2737

Next important technology?

Recently we have seen the widespread adoption of carbon fiber and geared turbofans. We are about to see folding wingtips. Next might come... Ducted fans: Higher bypass ratio than a normal dan, better noise than props or inducted fans Unducted fans: even better bypass ratio but problems with noise co...

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by kitplane01
Wed Feb 28, 2018 6:16 am
Forum: Technical/Operations
Topic: ETOPS and Tri-Jets
Replies: 29
Views: 3521

Re: ETOPS and Tri-Jets

I don't understand this AT ALL. Why would the number of engines determine the amount of fire suppression you would need in the cargo hold? ETOPS isn't just about losing an engine, its a standard for how far a flight is allowed to be from the nearest suitable airport. One of the risks you have to ma...

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by kitplane01
Tue Feb 27, 2018 7:15 am
Forum: Technical/Operations
Topic: ETOPS and Tri-Jets
Replies: 29
Views: 3521

Re: ETOPS and Tri-Jets

Cargo fire suppression is usually the most restrictive element on ETOPS, For a 330' ETOPS qual you need the fire/smoke/fumes to be contained for 3:45. subtract 15 minutes for good measure, thus coming up with the 3:30 minute number. Boeing offer enhanced fire suppression systems for operators desir...

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by kitplane01
Mon Feb 26, 2018 6:51 am
Forum: Civil Aviation
Topic: Argentina and Colombia sign new bilateral; flights to increase significanlty
Replies: 18
Views: 1803

Re: Argentina and Colombia sign new bilateral; flights to increase significanlty

This bilateral, and most bilaterals, is written in terms of airplane flights. Of course that incentives larger aircraft. Why are they not written in terms of total seats? This would seem to better capture the economic criteria the governments are looking to regulate. For example instead of 28 flight...

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by kitplane01
Sun Feb 25, 2018 7:55 am
Forum: Technical/Operations
Topic: Possibility of the 797 having a T-Tail?
Replies: 62
Views: 6876

Re: Possibility of the 797 having a T-Tail

Correct me if I'm wrong, but I believe the main reason T-Tail aircraft aren't designed more often is simply because of the added weight needed for structural purposes. I would love to see another modern T-Tail though. That'd be gorgeous! Yeah, I had thought this to be the case, but on the flip side...

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by kitplane01
Sun Feb 25, 2018 7:48 am
Forum: Technical/Operations
Topic: ETOPS and Tri-Jets
Replies: 29
Views: 3521

Re: ETOPS and Tri-Jets

Just to be clear, a DC-10 or L-1011 that's an hour or three from shore and loses two engines is going to make land? Because if you're not far from shore the ETOPS rules don't matter. Quick note: The odds of losing two engines on a three engine plane exceed the odds of losing two engines on a two eng...

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by kitplane01
Thu Feb 22, 2018 7:17 am
Forum: Technical/Operations
Topic: ETOPS and Tri-Jets
Replies: 29
Views: 3521

ETOPS and Tri-Jets

Why did ETOPS rules treat two engine and three engine planes differently? Both can fly with the loss of one engine but not two. Or could a DC-10 really fly on one engine?

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by kitplane01
Thu Feb 22, 2018 12:57 am
Forum: Civil Aviation
Topic: Lelystad airport
Replies: 43
Views: 5086

Re: Lelystad airport

In my view they should impose the same curfew at AMS like the one at LHR, because noise at night is far more inconvenient. The lost capacity at night should be doubled (and therefore the total number of flights will go over the 500.000 limit) and made available for use during the rest of the day. T...

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by kitplane01
Thu Feb 22, 2018 12:54 am
Forum: Civil Aviation
Topic: Airbus increases profit by 189% in 2017
Replies: 36
Views: 3440

Re: Airbus increases profit by 189% in 2017

800 commercial jet deliveries forecast for 2018, if engine suppliers meet their commitments. Guess that’s a big ‘if’ but it would set a challenging target for Boeing to match. Geoff The higher percentage of WB frames delivered B vs A will keep the keep the crown in Seattle for years to come. If Boe...

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by kitplane01
Mon Feb 19, 2018 6:05 am
Forum: Civil Aviation
Topic: TK Fleet Oddities
Replies: 9
Views: 2707

Re: TK Fleet Oddities

I also don't see what is particularly "odd" about ordering both A321neos and 739max's. Both A321ceos and B737-900ERs currently form part of the TK fleet, and they have different purposes and serve different markets. However, I do believe the smaller narrowbodies (A319 and 737-700) do not ...

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by kitplane01
Thu Feb 15, 2018 3:24 am
Forum: Civil Aviation
Topic: 737MAX and the Collier Trophy
Replies: 15
Views: 2443

Re: 737MAX and the Collier Trophy

Erebus wrote:
AvObserver wrote:
While a lot of effort was put into the 737 MAX improvements, it's hardly as significant as a fair number of other nominees on this list.


Agreed. I thought the 787 ought to have made it into the list ahead of the 737 MAX. Or has it already done so before?


The 787 is not a 2017 achievement.

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by kitplane01
Tue Feb 13, 2018 5:22 pm
Forum: Civil Aviation
Topic: 737MAX and the Collier Trophy
Replies: 15
Views: 2443

Re: 737MAX and the Collier Trophy

Where is SpaceX's Falcon rocket, especially the flying the pieces back to earth parts ? The Falcon heavy should be nominated (and WIN) for 2018. This is the 2017 prize. The Falcon Heavy is the coolest rocket currently in existence. SpaceX is just the most technologically successful company in aeros...

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by kitplane01
Tue Feb 13, 2018 5:17 am
Forum: Technical/Operations
Topic: RR triple spool
Replies: 50
Views: 4626

Re: RR triple spool

What counts against it is interstage pressure losses, which gives twin-spools an edge at longer range. Do three spool engines have more stages than two stage engines? I would have thought the opposite, since in a three spool engine each stage is operating at a closer-to-optimum speed. Or do I misun...

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