Search found 302 matches

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by gloom
Mon Sep 02, 2019 10:25 am
Forum: Civil Aviation
Topic: Smoky A350!
Replies: 45
Views: 12048

Re: Smoky A350!

Well, to relax S.A.R.C.A.S.M. a bit... It's a bit like any diesel engine in your car. They're using heavy fuel (large particles, sticky). When you need to go from low-power mode (less fuel, less air) and accelerate, you just get more fuel into engine. But - you don't get more air until it spools up....

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by gloom
Sun Sep 01, 2019 6:33 pm
Forum: Technical/Operations
Topic: The reason the A350 has black cockpit window frames
Replies: 16
Views: 4773

Re: The reason the A350 has black cockpit window frames

They're probably using an old saying:
Any customer can have a window painted any color that he wants so long as it is black (rephrased with one word).

Cheers,
Adam

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by gloom
Fri Aug 30, 2019 8:03 am
Forum: Technical/Operations
Topic: Do airlines use full range of an aircraft when planning routes
Replies: 9
Views: 1703

Re: Do airlines use full range of an aircraft when planning routes

It's much more complicated. There are many things you need to consider. First, planes do not travel straight lines. They will travel on routes, or between points on route. That adds a few percent to the route (more on shorter hops, less on longer hops). Second. there are winds. They're measured all ...

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by gloom
Wed Aug 28, 2019 5:23 am
Forum: Civil Aviation
Topic: Another wide-body firefighting supertanker?
Replies: 53
Views: 6996

Re: Another wide-body firefighting supertanker?

I actually love the Be200 idea. Not quite large (size of 737), but being able to land on water and tank it, instead of going to nearest airport, is quite useful. However on a large scale, I just wonder which one is more effective: a large plane, or a fleet of small ones. Large one would be more effe...

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by gloom
Tue Aug 27, 2019 7:44 am
Forum: Technical/Operations
Topic: What kind of waypoints/routes (FAA) are used to prepare a flight plan in practice?
Replies: 10
Views: 1453

Re: What kind of waypoints/routes (FAA) are used to prepare a flight plan in practice?

Just to add a little extra: The FAA Exactly. What was described above, is the US-only view. In many other parts of the world, rules are different. There are countries where routes are no longer low-hi profiled, but could still be FL dependant (available FL restrictions, country-specific levels). The...

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by gloom
Fri Aug 23, 2019 5:15 am
Forum: Civil Aviation
Topic: Qantas plans 3 Project Sunrise research flights in Q4 2019 using 787-9's, final decision on PS by end of 2019
Replies: 320
Views: 47366

Re: Qantas plans 3 Project Sunrise research flights in Q4 2019 using 787-9's, final decision on PS by end of 2019

I'd like to point out one thing - compelling option could be anything but a replacement plane to do the job. It could be a plane extra price/plan if you start 12 months later, or leasing on 0% from Boeing's partner ("we'll get you the planes on agreed price/120, 10 year plan, no extra payments&...

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by gloom
Mon Aug 19, 2019 8:13 pm
Forum: Civil Aviation
Topic: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft
Replies: 1494
Views: 273739

Re: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft

The question is whether it will take place within the constraints of the existing center wing box (and main gear that fits into it) or whether a new and longer center wing box will be needed. I don't see 787 staying within current wingbox. For two reasons: 1. pavement load is already quite high, an...

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by gloom
Sun Aug 18, 2019 12:07 pm
Forum: Technical/Operations
Topic: Time to Cruise Level
Replies: 4
Views: 1125

Re: Time to Cruise Level

+1 to Spacecadet. It's the phrase to say that you're not going to get a clearance to cruise *yet*. Usually due to traffic and/or complex situation. The "expect in" is more or less an estimation when the situation will allow to climb to cruise. Typical woridng (in one phrase, not two separa...

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by gloom
Wed Aug 14, 2019 12:05 pm
Forum: Technical/Operations
Topic: A320neo vs B737max
Replies: 64
Views: 9244

Re: A320neo vs B737max

Indeed, the 737 Classics and Next Generations all featured 152-155 cm fans, while the original CFM-56-2 and all versions fitted to A320s featured 173 cm fans. It's not only the size, but also the shape. https://upload.wikimedia.org/wikipedia/commons/7/78/Boeing_737-400_Engine.JPG Cheers, Adam

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by gloom
Wed Aug 14, 2019 9:56 am
Forum: Technical/Operations
Topic: A320neo vs B737max
Replies: 64
Views: 9244

Re: A320neo vs B737max

WIederling wrote:
VSMUT wrote:
It is clear that the 737MAX has suboptimal engines. It was a compromise from day 1.


That started with the NG already. Only not as pronounced as with the MAX.


Even earlier. See inlet of Classics, famous "circle-like" shape of nacelle.

Cheers,
Adam

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by gloom
Wed Aug 14, 2019 7:13 am
Forum: Civil Aviation
Topic: Rumor: Airbus to launch A350-1000ULR
Replies: 427
Views: 78594

Re: Airbus to launch A350-1000ULR

I would not at all be surprised if the A350-1000ULR is like the A350-900ULR: a) same operating weights (so a 319,000kg MTOW) Actually it was the other way round: 1. ULR introduced 280t version (from 275t standard) 2. 280t became option for standard as well. If it goes like that, I expect ULR to be ...

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by gloom
Thu Aug 08, 2019 1:24 pm
Forum: Technical/Operations
Topic: VTOL Jet Engine Aircraft and VTOL Jet Engine
Replies: 21
Views: 2240

Re: VTOL Jet Engine Aircraft and VTOL Jet Engine

I feel it would not be viable. The first thing that worries me much is 8 engines, 8 possible points where something might go wrong. With one of engines damaged/shutdown, could be difficult to compensate, due to geometry, especially since you cannot compensate aerodynamically or with thrust vectoring...

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by gloom
Fri Jul 26, 2019 2:39 pm
Forum: Technical/Operations
Topic: Max Engines
Replies: 27
Views: 5997

Re: Max Engines

Leap1B, powering 737 MAX, is one of the versions for LEAP engine family. Other applicants would be A320Neo, and Comac C919. While C version (Comac) is a bit different animal, A version is pretty similar. Boeing (with its lower gear) required different fan, but otherwise, they're very similar (if not...

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by gloom
Fri Jul 19, 2019 9:28 am
Forum: Civil Aviation
Topic: How Little Cargo Revenue Really Matters For DL And UA
Replies: 89
Views: 10500

Re: How Little Cargo Revenue Really Matters.

I think three things are different across the world, that make OPs topic title irrevelant. Most of them have been mentioned, but I'd like to have them organized. 1. Airlines across the world are different in numbers. It's been analyzed above. 2. Routes are different. If you have a feeder model, you'...

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by gloom
Wed Jul 17, 2019 9:55 am
Forum: Technical/Operations
Topic: Main reasons why long range planes are often used on rather short to medium routes?
Replies: 20
Views: 2692

Re: Main reasons why long range planes are often used on rather short to medium routes?

Anecdotally I think that climb and descent fuel burn evens out somewhat. You burn more fuel climbing for about 30 minutes, but you burn less fuel descending for about 30 minutes. Not saying the increase and decrease are precisely the same, of course, but the cruise average is roughly the same as th...

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by gloom
Tue Jul 16, 2019 6:34 am
Forum: Technical/Operations
Topic: Gulfstream G-IV climb performance
Replies: 2
Views: 1175

Re: Gulfstream G-IV climb performance

I guess it's the case for all planes. If they're light, they go fast up. IIRC, there was a video from Japan back in 90s, where 767 on domestic route went 6000+, 15mins all the way to F410, on 1h15m flight. I would not be surprised if many widebodies, on full pax/no cargo and 1-2hr flight managed 500...

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by gloom
Sat Jul 06, 2019 5:49 am
Forum: Technical/Operations
Topic: Captains admonishing FO's for using speed brake on descent
Replies: 52
Views: 8886

Re: Captains admonishing FO's for using speed brake on descent

Yeah, and there are also these approaches where descend rate is high. Throw in some shortcuts or speed reductions, have a "good glider" like 787 or 350, and I can't see anyone planning a proper descend. I remember coming into Narita, on SWAMP N app to 16L. Limit at SWAMP (33 miles DME from...

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by gloom
Wed Jul 03, 2019 10:56 am
Forum: Civil Aviation
Topic: SAA Leasing A350
Replies: 133
Views: 25908

Re: SAA Leasing A350

Let's assume worst case. In regular lease price topic, it's been assumed it costs around 1 m USD per month to lease A350. Let's assume A340-600 value is nil (I guess it would be a bit higher, but worst case, A359 would be probably a bit higher than 1m). Let me assume as well, that it's just the fuel...

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by gloom
Sat Jun 22, 2019 8:45 am
Forum: Civil Aviation
Topic: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War
Replies: 292
Views: 34179

Re: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War

We can debate until we are blue, but Boeing has sandwhiched the A350. As you probably know, there are two ways to look at that. One is B making a gap smaller (which is what they exactly do, with 78J and MTOW raise). Other is A made a plane completely capable to fight at both ends (against 787 in 25...

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by gloom
Fri Jun 21, 2019 7:24 am
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 445
Views: 85745

Re: 787 vs A350 range

however, 20t over 9.5hrs? the 789 returns 5.4/hr fully loaded on ULH Do us a favor and go back over this thread. At Ma .85 TAS is more or less 500kts. Range over 5000 is more or less 10hrs. Payload 40t, DOW 135t, ZFW 175, fuel required 56.3t. TOW 231.3t. Average: 5.63 t/hr. Not even close to 5.4, n...

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by gloom
Fri Jun 07, 2019 9:43 am
Forum: Civil Aviation
Topic: A350 In Service Thread - 2019
Replies: 28
Views: 6466

Re: A350 In Service Thread - 2019

40-50 kg per tonne is a short flight, on long flights it’s as high as for 1000 kg loaded, 300-500 kg is burnt just to carry it to the end. AFAIR from WAB of one of Europe's carriers, there was a figure of 50-60kg/hr/tonne on 763. I'd guess it's a bit less than that on 787 or A350. I guess I just mi...

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by gloom
Fri Jun 07, 2019 6:51 am
Forum: Civil Aviation
Topic: A350 In Service Thread - 2019
Replies: 28
Views: 6466

Re: A350 In Service Thread - 2019

Extrapolating from a slightly shorter sector, max payload should be around 55t for the iah sector with fuel burn working out to approximately 6.7t per hour. Out of curiosity what would be the fuel burn with a payload of 40 ton? [emoji848] There's widely assumed rule of thumb that you need approx. 4...

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by gloom
Mon May 27, 2019 8:19 am
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 445
Views: 85745

Re: 787 vs A350 range

Armadillo1 wrote:
346 vs 77w discussed before? its interesting too. and 744


Ever cared to notice the thread name?

I guess you should go and open a new thread, with a title reflecting your question.

Cheers, Adam

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by gloom
Mon May 27, 2019 6:33 am
Forum: Civil Aviation
Topic: Updated, confirmed - Air NZ picks Boeing for wide-body order
Replies: 292
Views: 54155

Re: Report - Air NZ picks Boeing for wide-body order

wangjm777 wrote:
IIRC the 787 fuel burn is 5.4t and the A350 is a little over 6.0t. That is about 10% advantage.


You still need to learn, my young padawan. Check https://www.airliners.net/forum/viewtopic.php?f=5&t=1406387 this link and come back once you've learned.

Cheers,
Adam

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by gloom
Mon May 27, 2019 6:29 am
Forum: Civil Aviation
Topic: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft
Replies: 1494
Views: 273739

Re: Updated: Qantas saying it is almost ready to select Project Sunrise aircraft

wangjm777 wrote:
Does the recent NZ order indicate that the “ER” version of 787-9/-10 is back in the competition for Project Sunrise?


No.
It's not in the competition for exactly the same reason the 359 was not an option. It's too small for pax, bags and enough fuel. It's nowhere near.

Cheers,
Adam

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by gloom
Mon May 13, 2019 6:55 am
Forum: Technical/Operations
Topic: 787-10 In service Performance
Replies: 26
Views: 5745

Re: 787-10 In service Performance

a.net experts seem to forget one thing, quite easily. 78J is exactly a larger 789. Longer fuselage, more seats, higher OEW/DOW variant. It was made to move more people over LongHaul rather, as opposed to 789, which was made to carry less people on ULH ranges. This however would not stop this plane f...

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by gloom
Fri Apr 26, 2019 12:31 pm
Forum: Civil Aviation
Topic: Delta Widebody Thread - 2019
Replies: 937
Views: 176282

Re: Delta Widebody Thread - 2019

I'm sure a few pilots and miscellaneous middle managers are better informed about Delta's plans than the CEO. CEO needs to keep the costs down. He needs to say whatever is required to keep shareowners happy. Every statement he makes becomes public. So... informed? Yeah, he's probably way better inf...

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by gloom
Fri Apr 19, 2019 6:48 am
Forum: Technical/Operations
Topic: Perfomance difference between King Air 350 and B1900D
Replies: 12
Views: 3873

Re: Perfomance difference between King Air 350 and B1900D

Without even looking it up I’ll bet the 350 has much higher rated engines then the Delta. You just lost your bet. B1900D uses PT6A-67D, rated 1200SHP. 350 uses PT6A-60A, rated 1050SHP. 1900D is a bit heavier, but it's negligible (10%, is less than power difference). Initial climb rate is pretty muc...

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by gloom
Tue Apr 16, 2019 8:15 pm
Forum: Technical/Operations
Topic: Mode S transponder ID
Replies: 10
Views: 1670

Mode S transponder ID

Hello, I was wondering, how is the transponder marked with its unique ID (hex-code, or fully: Icao 24-bit identifier). Is that factory built-in, or programmed later? Is that set forever (for example by some physical alterations, similar to OTP - one time programmable - chips), or could it be reprogr...

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by gloom
Sun Apr 14, 2019 5:12 am
Forum: Technical/Operations
Topic: De-rating a CFM56?
Replies: 14
Views: 3303

Re: De-rating a CFM56?

Will the max EGT reduce and the EGT margin increase during normal operations.? Yes. All parameters depending on thrust will be lower. Lower MX (as lower thrust is actually derate), lower EGT, lower rotations etc. Of course, keep in mind every single engine is different, so comparing one to other co...

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by gloom
Sat Apr 13, 2019 5:05 am
Forum: Technical/Operations
Topic: De-rating a CFM56?
Replies: 14
Views: 3303

Re: De-rating a CFM56?

Can someone please explain why a manufacturer would charge less for a derated engine if it's simply a plug change? Would it have to do with power-by-the-hour setups where the engine would presumably last longer between overhauls if it wasn't operated at full rated power? Can't promise it's the same...

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by gloom
Thu Apr 11, 2019 6:57 am
Forum: Civil Aviation
Topic: AD to be issued on 787 RR Trent 1000 TEN engines
Replies: 28
Views: 5820

Re: AD to be issued on 787 RR Trent 1000 TEN engines

I feel that we have reached the edge of current technology limits and continuing to push the new models and new engines beyond the limitations. +1, but I wouldn't call it "beyond limitations", it's just the wearoff, not fundamental wrong technology. It's more a manufacturing and quality p...

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by gloom
Tue Mar 19, 2019 9:31 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 717820

Re: B737MAX Grounded Worldwide

I was thinking about this flight, its supposed (still) connection to Lion Air, things that got so bad at Lion Air flight. Two points that I'd like to have confirmed by people with deeper knowledge. 1. If the situation was similar, the plane was more-or-less flyable. There were three problems (more o...

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by gloom
Mon Mar 18, 2019 9:18 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 717820

Re: B737MAX Grounded Worldwide

http://fsims.faa.gov/wdocs/mmel/b-777_rev 20a.pdf

Page 351. It has three statics, but only 2 AoAs (and MMEL allows operation with only one working).

Cheers,
Adam
-->

prebennorholm wrote:
You are mistaken. The 777 has three.


Are you sure? FAA seems to disagree.

http://fsims.faa.gov/wdocs/mmel/b-777_rev 20a.pdf

Page 351. It has three statics, but only 2 AoAs (and MMEL allows operation with only one working).

Cheers,
Adam

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by gloom
Sun Mar 17, 2019 7:44 am
Forum: Technical/Operations
Topic: Winglets On Older Jets
Replies: 9
Views: 1480

Re: Winglets On Older Jets

Winglets improve fuel consumption is what I have read. Maybe that is what I need to understand first. I am wondering how winglets would improve the 737-200 and the 707/720 with winglets? What about the L-1011? It was such an advanced aircraft, would winglets have improved the greatness of the L-101...

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by gloom
Sun Mar 17, 2019 7:29 am
Forum: Civil Aviation
Topic: LOT and Budapest
Replies: 17
Views: 3785

Re: LOT and Budapest

Two reasons not to go on with Budapest at the moment: 1. Problem regarding RR/Trent1000C. Until situation is resolved, LOT will not open/expand network from BUD, and I guess home market will be first to stabilize. 2. On local forum the was a link to Budapest fan webpage, stating utilization numbers ...

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by gloom
Thu Mar 14, 2019 3:20 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 719691

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobip

It is quite relevant actually when you allow a direct competitor to investigate a problem. Seems like conflict of interest to me. What would be more conflicting: a) NTSB reading, supporting etc b) BEA reading, supporting with support from NTSB (guaranteed by US-built plane)? You just opted for A be...

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by gloom
Thu Mar 14, 2019 3:13 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 719691

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Apparently of wasting time in discussions with US officials who pestered them to let the NTSB do the investigation against Ethiopia's wishes to have the investigation done by an European agency.... There was never such discussions. Plane crashed on Ethiopian ground, been flying under Ethiopian flag...

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by gloom
Thu Mar 14, 2019 2:29 pm
Forum: Technical/Operations
Topic: How is Boeing testing the 737 MAX?
Replies: 5
Views: 933

Re: How is Boeing testing the 737 MAX?

I'd say you could do explore and check in simulator. So, I think Boeing's already past that with timeline for update (unless something new has already emerged, but still that would be checked in sim first). This flying should rather be a check confirming simulator results (but I don't believe that, ...

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by gloom
Wed Mar 13, 2019 3:08 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 717820

Re: Should airline regulators consider grounding B737 MAX series

and then you have a plane in hands with no basic stability and pretty anormal flight behavour I wouldn't say it's abnormal, it's probably flyable etc. The problem is - flight characteristics are probably noticeably different from what you've learnt, and what you expect. That's why I believe groundi...

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by gloom
Wed Mar 13, 2019 3:03 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 719691

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

What's involved in 'ditching' MCAS altogether? Change of CoG, new tail, rear fuselage plug, rear fuel tank? Probably a new nacelle that generates less lift at high AoA. I believe also for increased rotational force from engines (more drag on idle, more thrust on full, engine further forward and up)...

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by gloom
Tue Mar 12, 2019 1:34 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 719691

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Not sure, where you're trying to go, but the numbers seem non adequate: (i did some cut from quote to show my case) their safety records were downright abysmal: Boeing 707: 1962: 4 crashes in 8 months with a total of 435 fatalities Boeing 727: 1965 (First Year of Service) 3 crashes in 87 days with a...

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by gloom
Tue Mar 12, 2019 11:35 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 719691

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

We have absolutely 0 preliminary information about this crash, nothing. Wwhat we know (it's more or less confirmed) is that there was some problem with controls, or at least what pilots believed to be. Aircraft departure profile (first two minutes) seems consistent. This would definitely point into...

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by gloom
Thu Feb 28, 2019 10:29 am
Forum: Technical/Operations
Topic: GE9X Record Breaker
Replies: 60
Views: 9926

Re: GE9X Record Breaker

[quote="zeke" I do not know specifics, my guess is the engine has additional built in margins so when thrust bumps or hot and high conditions are there they can maintain full thrust up to a higher density altitude.[/quote] 100% true. Max thrust is something sustainable for a number of minu...

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by gloom
Fri Feb 22, 2019 8:37 am
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 445
Views: 85745

Re: 787 vs A350 range

A lot depends on loads as well. That one especially. https://www.youtube.com/watch?v=aEUKs_66Qa4 It clearly shows (at time 1:12) 2.47t/hr/engine probably somewhere around 1hr into flight (FU: 3050kg per engine). The plane is certainly light, so it does 5t/hr. Well below fuel burn assumed here. It j...

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by gloom
Fri Feb 22, 2019 8:28 am
Forum: Civil Aviation
Topic: a MTOW increase on 787-10 to compete with A359?
Replies: 605
Views: 86340

Re: a MTOW increase on 787-10 to compete with A359?

Interesting data on recent UA and DL's proposals for their HND route: There's something fundamentally wrong with these numbers. If assumed fuel burn is similar, there's no way heavier frame (78J is definitely heavier than 359) with LOWER MTOW (depending on which variant Delta has/choose, 21t or 14t...

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by gloom
Sun Feb 03, 2019 2:50 pm
Forum: Civil Aviation
Topic: Emirates considering order changes - Airbus A380 for A330/A350 confirmed, Boeing 787 for 777-9 still possible
Replies: 879
Views: 138950

Re: Emirates is exploring switching the Airbus A380 to A350

A NEO needs engines ,engines that allow it to win against a 777-9 and stay competitive with a 787/A350 engine update. There are no such engines at the moment. XWB can be tuned for 72-74klbs thrust range. And it's already certified. With that being said, I still don't think it's a considered option....

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by gloom
Sat Feb 02, 2019 7:35 am
Forum: Civil Aviation
Topic: Emirates considering order changes - Airbus A380 for A330/A350 confirmed, Boeing 787 for 777-9 still possible
Replies: 879
Views: 138950

Re: Emirates is exploring switching the Airbus A380 to A350

A stretch adds weight. If the MLG is at its limits....there is no benefit over a 777-9. The point of a simple stretch, like the 787-10, is to trade less range for more payload. Maximum weights don't change, It's true about weight you're probably think about - MTOW. You don't raise MTOW, sure. The p...

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by gloom
Sat Jan 26, 2019 7:30 am
Forum: Civil Aviation
Topic: a MTOW increase on 787-10 to compete with A359?
Replies: 605
Views: 86340

Re: a MTOW increase on 787-10 to compete with A359?

My sole point is very few airlines will buy the 78J because it is a great hauler of cargo. The focus on MTOW and a full cargo load in an attempt to diminish the capability of the 78J is a little silly. Cargo is a nice add on....but it does not keep pax airliners flying. First, you're right it's not...

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by gloom
Wed Jan 23, 2019 2:42 pm
Forum: Civil Aviation
Topic: a MTOW increase on 787-10 to compete with A359?
Replies: 605
Views: 86340

Re: a MTOW increase on 787-10 to compete with A359?

The 78J is less than 2% over a 789. The differences between a 789 and an A359 have been documented on a.net. No sources to support claims, just more claims. No discussion, then, just trolling. You may still believe takeoff thrust (or corresponding inlet size) indicates the difference between cruise...

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