Search found 237 matches

by Eyad89
Thu Sep 20, 2018 12:33 pm
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3104
Views: 366979

Re: Boeing 797 Discussion Thread - 2018

NMA will have a much lower OEW (the 767-300ER is twice that of the 737), a much newer wing with significantly better aerodynamics and engines multiple generations newer and more efficient so it should prove a more effective platform than the 767 family. Even if the 797 has a fuel burn per seat that...

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by Eyad89
Sun Sep 16, 2018 8:44 pm
Forum: Technical/Operations
Topic: Post for 787 Pilots. What is the Typical Real World Fuel Burn for a 789?
Replies: 18
Views: 1501

Re: Post for 787 Pilots. What is the Typical Real World Fuel Burn for a 789?

The data provided exactly includes hours flown across multiple sectors. Read more carefully. That is why it is an average. Basic math would tell you with a decent enough sample size an average is statistically significant. Again...this is basic math. Sorry if you don't like the numbers. No, you are...

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by Eyad89
Sun Sep 16, 2018 1:16 pm
Forum: Technical/Operations
Topic: Post for 787 Pilots. What is the Typical Real World Fuel Burn for a 789?
Replies: 18
Views: 1501

Re: Post for 787 Pilots. What is the Typical Real World Fuel Burn for a 789?

The data provided exactly includes hours flown across multiple sectors. Read more carefully. That is why it is an average. Basic math would tell you with a decent enough sample size an average is statistically significant. Again...this is basic math. Sorry if you don't like the numbers. No, you are...

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by Eyad89
Sat Sep 15, 2018 1:44 pm
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread 2018
Replies: 1375
Views: 477571

Re: Airbus A350 Production/Delivery Thread 2018

IB got the first version of the modified winglet for the A359, does that mean all other deliveries will get that automatically as well?

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by Eyad89
Fri Sep 14, 2018 2:59 pm
Forum: Civil Aviation
Topic: Diversion of IB A350 causes RR shares to drop
Replies: 90
Views: 19297

Re: Diversion of IB A350 causes RR shares to drop

[ The XWB is newer, has much less in service time and the problems are durability based so I remain unconvinced that they know it isn’t a problem there too. The timelines don’t work out for me. The first reports of corrosion issues in the Trent’s were in 2016. The EASA and FAA restrictions occurred...

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by Eyad89
Fri Sep 14, 2018 11:45 am
Forum: Civil Aviation
Topic: Boeing Rolls out Static Test 777-9X
Replies: 125
Views: 21247

Re: Boeing Rolls out Static Test 777-9X

The folding wingtip is actually a relatively small part of the wing. People worrying about problems with it likely didn’t realize how only a tiny part of the wing folds. It's actually THE tip device (i.e. raked wingtip) that folds, it's not a part of the wing itself. It's not like in naval aviation...

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by Eyad89
Wed Sep 12, 2018 2:10 pm
Forum: Civil Aviation
Topic: Boeing 777X Production Thread 2018
Replies: 215
Views: 50917

Re: Boeing 777X Production Thread 2018

If I understood correctly winglet are more efficient at cruise and for such an LR bird I'd think you don't want a "flat" wing once folding tips are deployed, right ? Or the tip device is just missing as not needed for fatigue testing ? The raked wingtip (while flat) adds 85% of the wingti...

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by Eyad89
Sat Sep 08, 2018 1:53 pm
Forum: Civil Aviation
Topic: EK looks to grow US network; considers smaller 787/777 versions
Replies: 165
Views: 26682

Re: EK looks to grow US network; considers smaller 787/777 versions

More specific, the engine orders of the A380 and 787 will be tied together. They haven't firmed the 777X in terms of moving from a conditional order to unconditional, because engine negotiations for all three models are now intertwined (they didn't start that way). Plus 777X performance and penalti...

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by Eyad89
Sat Sep 08, 2018 1:25 pm
Forum: Civil Aviation
Topic: EK looks to grow US network; considers smaller 787/777 versions
Replies: 165
Views: 26682

Re: EK looks to grow US network; considers smaller 787/777 versions

Back in the days when EK was evaluatin the case of 78X vs A359, I thought A359 might win it just because of its flexibility of doing such thin and long-distance routes, somethig the 78X can’t do. Now it makes sense, EK might split its 787 order into 789 and 78X. Problem solved. I wonder why EK didn’...

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by Eyad89
Sat Sep 08, 2018 1:11 pm
Forum: Civil Aviation
Topic: Arabian aviation thread - 2018
Replies: 182
Views: 14980

Re: Arabian aviation thread - 2018

Any update on the SV supposed 779 order?

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by Eyad89
Sat Sep 08, 2018 1:09 pm
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread 2018
Replies: 1375
Views: 477571

Re: Airbus A350 Production/Delivery Thread 2018

A350 might be the first wide-body that looks better with the smaller variant IMO. Other smaller variants of different wide-bodies look kinda overwinged.

Perhaps that’s because A359 wasn’t initially supposed to be the baby of the family.

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by Eyad89
Sat Sep 08, 2018 7:08 am
Forum: Civil Aviation
Topic: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2019
Replies: 264
Views: 37078

Re: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2019

zero reason for them to do that. The A359ULR is limited by the 4wheel trucks on each of its main gear, which is the reason it doesn't have a higher weight than what's now offered on the standard A359, and thus has to trade payload for fuel storage. The A35K's 6truck bogey allows for far higher weig...

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by Eyad89
Thu Sep 06, 2018 8:26 am
Forum: Civil Aviation
Topic: Singapore Airlines reveals configuration on 2 class A359, ADL to be first route
Replies: 47
Views: 8082

Re: Singapore Airlines reveals configuration on 2 class A359, ADL to be first route

Is this first delivery of an aircraft without Premium economy since they started? What is the strategy on what routes do and don’t have premium economy The same strategy as the 787-10, used on routes up to 8 hours, so both frames will replace current regional jets being the 772, 773A and A333 Why d...

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by Eyad89
Thu Sep 06, 2018 6:51 am
Forum: Civil Aviation
Topic: The Muddle of the Market aircraft (No, this isn’t a typo)
Replies: 327
Views: 29384

Re: The Muddle of the Market aircraft (No, this isn’t a typo)

What made the 777 the legend it is today wasn't some estimate for the size of the market, or what the competition was doing, but that Boeing exceeded expectations and delivered the greatest plane ever built. This happened partly because of Boeing engineers and managers, who designed an aircraft of ...

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by Eyad89
Tue Sep 04, 2018 5:41 pm
Forum: Civil Aviation
Topic: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2019
Replies: 264
Views: 37078

Re: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2019

"Qantas promises 20-hour direct flights from London to Sydney by 2022" https://www.yahoo.com/lifestyle/qantas-promises-20-hour-direct-143704714.html We now timeframe/year for the from Qantas... Coincidence? That is the year the 778 will debut.... We don’t know what year A350-1000ULR will ...

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by Eyad89
Thu Aug 30, 2018 12:46 pm
Forum: Civil Aviation
Topic: Rumour: British Airways - Big Aircraft Order soon
Replies: 218
Views: 43413

Re: Rumour: British Airways - Big Aircraft Order soon

We know for a fact that BA has considered the 779 at least once before, but they ordered the A35K anyway. What makes them reconsider it now? Placing orders depends directly on the strategies of airlines, and a strategy cannot change in such short time, considering how recent the A35K order is. I can...

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by Eyad89
Wed Aug 29, 2018 7:49 pm
Forum: Civil Aviation
Topic: Rumour: British Airways - Big Aircraft Order soon
Replies: 218
Views: 43413

Re: Rumour: British Airways - Big Aircraft Order soon

bmacleod wrote:
According to a news release back in May; BA was looking at a big 777X order.....

https://aviationnews.online/2018/05/05/british-airways-set-to-order-up-to-30-777-9-10/


It mentions a potential order of the 777-10?

That eacalated quickly !

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by Eyad89
Wed Aug 29, 2018 9:07 am
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread 2018
Replies: 1375
Views: 477571

Re: Airbus A350 Production/Delivery Thread 2018

And so the delivery target for this year is 105, and since the program is expected to start generating a positive cash flow sometime this year, 120 frames for 2019 all generating a positive cash flow should be good news for Airbus.

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by Eyad89
Fri Aug 24, 2018 9:44 pm
Forum: Civil Aviation
Topic: Will EK ever firm its 787 order?
Replies: 26
Views: 5103

Re: Will EK ever firm its 787 order?

We know that EK had its doubts if 78X could take off with full payload in the summer, could we say that they are waiting for more performance data? Just a guess.

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by Eyad89
Fri Aug 24, 2018 8:59 pm
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 29532

Re: Which Frame Will Be More Efficient....The A35J or the 779?

We can’t conclude based on a single flight on a certain route. On the 16th of August, SQ’s A359 climbed straight away to 34,000 ft on the SIN-SFO route, and it spent roughly the last 40% cruising at 41,000 ft. The 359 will go to FL350 departing at MTOW, I haven’t flown the 35K anywhere near max wei...

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by Eyad89
Fri Aug 24, 2018 1:20 am
Forum: Civil Aviation
Topic: Rumour: No A350’s for Etihad
Replies: 65
Views: 13958

Re: Rumour: No A350’s for Etihad

As the EY’s A350 is supposed to start getting assembled soon, we will know if it is a cancellation or a deferment.

If it is a cancellation, I am curious how they will settle the penalties for the 60+ frames.

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by Eyad89
Thu Aug 23, 2018 9:53 pm
Forum: Civil Aviation
Topic: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2019
Replies: 264
Views: 37078

Re: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2

qf002 wrote:

- whether the A35K can make the trip without auxiliary tanks (which add weight and take up cargo space on flights where they aren’t required)


I don’t think that’s possible, unless the payload is significantly reduced.

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by Eyad89
Thu Aug 23, 2018 1:21 pm
Forum: Civil Aviation
Topic: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2019
Replies: 264
Views: 37078

Re: Airbus and Boeing meet Qantas Project Sunrise challenge, RFP to be completed by end of 2019

If the Perth load factors are truely thet high, then I think it is almost certainly going to be a 778. Their choice of 2022 as a lunch year hints at 778 as well, becaus that’s when 778 starts entering the market. But I got confuses, half the article mentions how QF is targeting a tweaked version of ...

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by Eyad89
Thu Aug 23, 2018 5:30 am
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 29532

Re: Which Frame Will Be More Efficient....The A35J or the 779?

Some examples. The 787-8 can go straight to 36,000ft at MTOW. The 787-9 can only go up to 32,000ft, same wing, heavier MTOW. The 777W can only go to 30,000ft it is underwinged. Singapores A350-900 to north americas initial cruise is only 31,000ft. After 4 hours it climbs to 34,000ft and gets to 39,...

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by Eyad89
Wed Aug 22, 2018 9:49 pm
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 29532

Re: Which Frame Will Be More Efficient....The A35J or the 779?

We know that the target sfc for the GE9X is about 10% better than that of the GE90-115B. Does anyone know what the expected overall L/D of the 777-9 compared to 777-300ER? My wild estimate is between 5% to 8%, but the range is too large and it's only based on the aspect ratio deduced from the planf...

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by Eyad89
Tue Aug 21, 2018 10:37 pm
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 29532

Re: Which Frame Will Be More Efficient....The A35J or the 779?

The induced drag at OEW is moot since there is no fuel to fly anywhere. That's just as well since there's zero payload at OEW. Absolutely, but the point I was trying to make is how 12 tons difference in OEW should not be taken lightly .. so those figures that are thrown around here should be accurate

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by Eyad89
Tue Aug 21, 2018 5:57 pm
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 29532

Re: Which Frame Will Be More Efficient....The A35J or the 779?

The latest I've seen the OEW of the 777-9 was expected to be 190T at launch and has decreased a bit, now 188T. I'm very interested in the 176-177T background / sources. The difference between 176T and 188T is significant. If altitude, speed, and angle of attack were held constant, than induced drag...

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by Eyad89
Sun Aug 19, 2018 10:55 pm
Forum: Technical/Operations
Topic: Aspect ratio vs span loading in induced drag calculations
Replies: 12
Views: 818

Re: Aspect ratio vs span loading in induced drag calculations

When you do consider air density, the absolute value for Di depends on AR In the way I see it from the equation, allow me to make a small modification. Replace air density in that statement with Cl, and then it all makes sense to me. Cl depends on air density( so you are absolutely correct here), w...

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by Eyad89
Sun Aug 19, 2018 10:48 pm
Forum: Technical/Operations
Topic: Aspect ratio vs span loading in induced drag calculations
Replies: 12
Views: 818

Re: Aspect ratio vs span loading in induced drag calculations

I think you are getting mostly there, but in Step #1 of your post, how are you arriving at the conclusion that AR is cancelled out in the formula for Cdi? I would need to write it out, but algebraically, I don't believe this is correct. Even when substituting the formula for C_l in your Cdi equatio...

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by Eyad89
Sat Aug 18, 2018 7:31 pm
Forum: Technical/Operations
Topic: Aspect ratio vs span loading in induced drag calculations
Replies: 12
Views: 818

Re: Aspect ratio vs span loading in induced drag calculations

I've been doing some reading, and I think I have started to understand the difference, allow me to add a bit to your post .. IMO a lot of confusion on AR vs. Span for Di calculations comes from not specifying the level at which the calculation is made. AR determines the Di coefficient but span deter...

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by Eyad89
Fri Aug 17, 2018 5:51 pm
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 29532

Re: Which Frame Will Be More Efficient....The A35J or the 779?

That's a superficial way to look at it. Yes wetted area matters but air density is also linear with skin friction. 777-9 will cruise higher due to lower wing loading. Actually, A35K is the one with the lower wing loading. 779 and A35K have almost the same wing area ( 466 vs 464 m^2), but the weight...

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by Eyad89
Sun Aug 12, 2018 2:48 pm
Forum: Civil Aviation
Topic: Turkish Aviation August 2018
Replies: 171
Views: 15266

Re: Turkish Aviation August 2018

According to routesonline, TK will configure their 789's with 300 seats, 30C and 270Y https://twitter.com/Airlineroute/status/1028636139090051072 In that case, C will probably be 5 rows of 2-2-2... just like the A330s (layout-wise, not number of rows). Does that make TK the first airline that would...

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by Eyad89
Sat Aug 11, 2018 3:49 pm
Forum: Technical/Operations
Topic: Aspect ratio vs span loading in induced drag calculations
Replies: 12
Views: 818

Re: Aspect ratio vs span loading in induced drag calculations

Thanks guys for the great input. Anyway, AR, is still a fundamentally very important measure of induced drag because it is a mathematical representation of how close a 3d wing comes to being an airfoil l. Remember, as the span approaches infinity you essentially have a 2d airfoil and thus no induced...

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by Eyad89
Sat Aug 11, 2018 11:00 am
Forum: Technical/Operations
Topic: Aspect ratio vs span loading in induced drag calculations
Replies: 12
Views: 818

Aspect ratio vs span loading in induced drag calculations

Whenever a discussion of lift-induced drag comes up in those forums, aspect ratio is likely discussed as the deciding factor in that regard. At first, this sounds about right from a mathematical point of view, simply because a common representation of the induced drag formula has the aspect ratio in...

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by Eyad89
Sun Aug 05, 2018 7:13 pm
Forum: Civil Aviation
Topic: 787 In Service Thread 2018
Replies: 96
Views: 13827

Re: 787 In Service Thread 2018

Qantas marks 4 months serving PER-LHR Some fast facts 244 flights 57,000 passengers 170,000 meals 26,000 Tim Tams 3,539,512 km's travelled https://twitter.com/Qantas/status/1025184898485760000 Well the passenger numbers I’m skeptical. That makes an average LF of 234/236 or 99% which seems very high...

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by Eyad89
Mon Jul 30, 2018 9:44 pm
Forum: Civil Aviation
Topic: Reduction of 787 deferred production cost slows.
Replies: 288
Views: 20472

Re: Reduction of 787 deferred production cost slows.

Let’s take it from this accounting professor from Central Oklahoma. “Had Boeing not deferred construction costs on planes already built, it would have had a deficit in net worth of $10.9 billion, net of estimated income tax benefits of $8.1 billion.” This was almost two years ago. He clearly stated ...

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by Eyad89
Mon Oct 16, 2017 8:43 pm
Forum: Non-Aviation
Topic: Here Comes TrumpCare
Replies: 293
Views: 11232

Re: Here Comes TrumpCare

As a side note, I really don’t like naming health care acts after people like Obamacare or Trumpcare. Let’s face it, many people didn’t like Obama for different reasons, and they would be happy to see him fail. ACA could save someone’s life, but this person could still want its repeal just to celebr...

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by Eyad89
Mon Oct 16, 2017 8:31 pm
Forum: Civil Aviation
Topic: Airbus A350 Production And Delivery Thread - 2016-2017 (Part 17)
Replies: 4438
Views: 1521014

Re: Airbus A350 Production And Delivery Thread - Part 17

Compared to the -900, I do not see much information on the -1000 testing. In particular, the google spreadsheet had pretty complete tables and charts for the -900, but data on the -1000 stop very early in the testing campaign. I am not sure whether it is because data was not made public, or just be...

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by Eyad89
Sat Oct 14, 2017 2:45 pm
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3104
Views: 366979

Re: Boeing officially forms program office to flesh out 797 plans

Scores of thousands of kilograms less weight is what justifies it. The 787-8 has an OEM OEW of 118,000kg. I expect MoM to come in around the 85,000 kilogram mark (around a 767-300ER). That is over 50,000 kilograms lighter and that is going to be huge in terms of trip fuel savings. That will also al...

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by Eyad89
Wed Oct 11, 2017 10:05 pm
Forum: Non-Aviation
Topic: Your Top Ten Favorite TV Characters Of All Time
Replies: 97
Views: 4456

Re: Your Top Ten Favorite TV Characters Of All Time

Recently, I have become a great fan of Frank Underwood. Kevin Spacy is a legend.

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by Eyad89
Wed Oct 11, 2017 9:59 pm
Forum: Non-Aviation
Topic: 2018 FIFA World Cup Qualification
Replies: 44
Views: 2153

Re: 2018 FIFA World Cup Qualification

The US is out and I am at a loss. I can't remember the last time I felt this bad. All they needed to do was tie against Trinidad & Tobago, the last place team in the group, and they completely blew it. What I can't fathom is that the team was completely lifeless for first 45 minutes and didn't ...

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by Eyad89
Sun Oct 08, 2017 7:43 pm
Forum: Civil Aviation
Topic: The Telegraph article: "Is this the beginning of the end for the world's biggest passenger plane?" (=A380)
Replies: 61
Views: 16158

Re: The Telegraph article: "Is this the beginning of the end for the world's biggest passenger plane?" (=A380)

A380 is bleeding cash and will only continue to do so. That is simply not true for the moment. Airbus has said it won't materially impact their cash flow at the lower production rates. So maybe - best case - it's a small bleed, a paper cut. Still Airbus would have been better off renting helicopter...

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by Eyad89
Sun Oct 08, 2017 8:01 am
Forum: Technical/Operations
Topic: Fuel Consumption Comparison B787-900 / A350-900 LFPG / KJFK / LFPG
Replies: 24
Views: 4557

Re: Fuel Consumption Comparison B787-900 / A350-900 LFPG / KJFK / LFPG

If we were going with 40+t and in 5000nm mission, I'd say that's probably more-or-less equal point, and with latest PIPs, 359 could be breaking into top position. But it's not the case here. BTW, just curious what would be L/D for 359. I'd risk it's quite close to 789, gains to overcome additional ...

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by Eyad89
Sat Oct 07, 2017 9:05 pm
Forum: Civil Aviation
Topic: Emirates to be first airline to take delivery of 777X
Replies: 52
Views: 21670

Re: Emirates to be first airline to take delivery of 777X

bigjku wrote:

1. That the 9 is exceeding expectations in performance as it moves along and is being simulated.




That's good to know. I am curious though, what part is outperforming its expectation? Did they manage to achieve an OEW that's lighter than expected? or wings aerodynamics maybe?

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by Eyad89
Fri Oct 06, 2017 9:44 pm
Forum: Civil Aviation
Topic: Airbus is examining 'A380-Plus'
Replies: 1034
Views: 193023

Re: Airbus is examining 'A380-Plus'

why is it that folks still want to only compare B748 sales to the A380? Don't forget, the entirety of the Boeing 747 program encompasses 5 different models and has sold well in excess of 1000 planes. Its not fair to single out one model of the 747. As a whole, the A380 will never match the sales of...

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by Eyad89
Thu Oct 05, 2017 7:34 am
Forum: Non-Aviation
Topic: Police act brutal against referendum voters in Catalonia, Spain
Replies: 183
Views: 4219

Re: Police act brutal against referendum voters in Catalonia, Spain

EU wouldn't simply take Catalonia in after this. If it ends that well then expect to see other regions in Europe that want to declare their independence as well. I always wonder though, does any region have the right to declare independence even if the government does not allow it? I mean, ignore th...

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