Search found 434 matches

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by masi1157
Wed Aug 26, 2020 1:40 pm
Forum: Travel, Polls & Preferences
Topic: Most geographically nonsensical routing?
Replies: 94
Views: 8482

Re: Most geographically nonsensical routing?

Is that Binter Canarias? Tenerife is my annual holiday location and the flight paths those ATRs take involve lots of strange loops and flying north so they can head to the south etc Sure, there is only Binter Canarias at GMZ/La Gomera (to TFN and occasionally to LPA). At VDE/El Hierro there are als...

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by masi1157
Fri May 15, 2020 7:45 pm
Forum: Non-Aviation
Topic: Stupid things observed during COVID
Replies: 421
Views: 23014

Re: Stupid things observed during COVID

But I understand, it isn't Georgia or Texas, its Germany, they never do nothing stupid there. You have no idea of Germany, do you? These things may be useless, maybe they are even stupid, but they are funny. And people enjoyed them, as far as I heard and read in TV and press here in Germany. Gruß, ...

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by masi1157
Mon Apr 13, 2020 5:38 pm
Forum: Travel, Polls & Preferences
Topic: Most geographically nonsensical routing?
Replies: 94
Views: 8482

Re: Most geographically nonsensical routing?

I wouldn't call it "nonsense", but well. Try to travel between the neighbouring smallest Canary Islands of La Gomera and El Hierro during winter season. We did that twice so far because they are our favourite islands.Their airports are just 70km apart, but you can only fly to Tenerife Nort...

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by masi1157
Thu Apr 02, 2020 1:21 pm
Forum: Travel, Polls & Preferences
Topic: Restaurant in Concorde in Germany
Replies: 6
Views: 760

Re: Restaurant in Concorde in Germany

I never heard of a restaurant in a Concorde in Germany. But just 3 weeks ago (immediately before the lockdown) I was in a greek restaurant in Hannover inside an old Vickers Viscount. That same aircraft has been used for a cafe for many years before it was moved to Hannover. Was it in Stadtallendorf?...

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by masi1157
Fri Mar 06, 2020 7:45 am
Forum: Travel, Polls & Preferences
Topic: Which airlines that will go down next in 2020?
Replies: 51
Views: 3968

Re: Which airlines that will go down next in 2020?

I heard that they are in more financial troubles due to MAX grouding, more planes and worst, Coronavirus outbreak. And then you "hope" they go bankrupt? Hundreds of employees lose their jobs? Thousands of passengers with booked and paid tickets lose their money? No, I don't understand at ...

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by masi1157
Thu Mar 05, 2020 8:03 am
Forum: Travel, Polls & Preferences
Topic: Which airlines that will go down next in 2020?
Replies: 51
Views: 3968

Re: Which airlines that will go down next in 2020?

SQ789 wrote:
... and I only have an hope that Norwegian will go bust next.

What personal interest would anybody have in that? I seriously don't understand it. We will board a flight of Norwegian in a few minutes and I hope we will fly with them again in the future. It always was a pleasure.


Gruß, masi1157

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by masi1157
Wed Mar 04, 2020 12:40 pm
Forum: Travel, Polls & Preferences
Topic: What in Your Opinion has been the Ugliest Commercial Jet?
Replies: 111
Views: 7184

Re: What in Your Opinion has been the Ugliest Commercial Jet?

It looks like 50 % or so are voting for the Airbus A380 as the ugliest jetliner ever. May I ask you why? I would add to that: Why does everybody like the B747? I found it impressing for its shear size when I saw the first B747-100 at HAM as a kid. But today I find that hump just ugly and it became ...

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by masi1157
Mon Mar 02, 2020 2:42 pm
Forum: Travel, Polls & Preferences
Topic: Trip to Munich for one day
Replies: 27
Views: 1473

Re: Trip to Munich for one day

You will have more than enough opportunities to fly on A320/21neos in the coming years, it might even become boring. Choose a place you want to visit for a few days (München is not the worst idea). And if the flight happens to be an A320neo, fine. If not, it will be next time. But just for the fligh...

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by masi1157
Fri Feb 28, 2020 11:11 pm
Forum: Travel, Polls & Preferences
Topic: If Eurowings was designed to compete with easyjet and Ryanair, why does it simply not do that?
Replies: 6
Views: 2565

Re: If Eurowings was designed to compete with easyjet and Ryanair, why does it simply not do that?

I don't care about their strategy. I don't care about lounge access and all those snobisms. I live close to HAM and I book the flight that suits me best, be it Ryanair, Easyjet. Wizzair, Norwegian, Eurowings or what so ever. Doesn't matter.


Gruß, masi1157

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by masi1157
Mon Feb 24, 2020 2:18 pm
Forum: Civil Aviation
Topic: Dust Storms affecting LPA, FUE and ACE airports
Replies: 17
Views: 1926

Re: Dust Storms affecting LPA, FUE and ACE airports

holczakker wrote:
"Somehow" Inter island flights were all flying up and down....


Some were flying, yes. On the island where I am now, 7 of the 8 daily flights yesterday were cancelled as were 2 more flights this morning.


Gruß, masi1157

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by masi1157
Mon Feb 24, 2020 9:54 am
Forum: Civil Aviation
Topic: Sand storm causes flight delays in Canary Islands
Replies: 4
Views: 1096

Re: Sand storm causes flight delays in Canary Islands

We are currently on El Hierro, which ist the small island in the far left on the BBC image. There it looks like only Fuerteventura and Lanzarote were hit, but in fact also here the sun is almost invisible, just a slightly lighter brown-yellow spot in the sky and we don't see the horizon. It was real...

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by masi1157
Thu Feb 20, 2020 9:16 pm
Forum: Travel, Polls & Preferences
Topic: Flying for Fun?
Replies: 20
Views: 1360

Re: Flying for Fun?

Did you log onto the wrong forum? :mrgreen: No, not at all. I love to fly, but I fly to get to intersting places (or go by train/bus/ferry/bicycle...), not just for the flight. And isn't this forum about airliners as a whole, not just flying in them? The engineering side of them was my job for 35 y...

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by masi1157
Thu Feb 20, 2020 8:09 pm
Forum: Travel, Polls & Preferences
Topic: Flying for Fun?
Replies: 20
Views: 1360

Re: Flying for Fun?

In fact I find it seriously strange. But that might be because I had more than enough flights in my life. I did however do a few flights on DC3 and Ju52/3m for fun and one single flight that was useless, expensive (compared to the train) and just for fun: An F100 of OLT from BRE to HAM. I was at BRE...

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by masi1157
Sat Feb 15, 2020 9:47 am
Forum: Travel, Polls & Preferences
Topic: What former airports have you flown into?
Replies: 45
Views: 2155

Re: What former airports have you flown into?

München Riem
Berlin Tempelhof
Istanbul Atatürk
Athens Ellenikon
Hong Kong Kaitak
Quito Marescal Sucre (the old one)


Gruß, masi1157

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by masi1157
Thu Feb 13, 2020 9:53 am
Forum: Travel, Polls & Preferences
Topic: If you could visit any country tomorrow, what country would it be?
Replies: 66
Views: 3856

Re: If you could visit any country tomorrow, what country would it be?

Not a country, but an entire continent: Antarctica! I would go there today if somebody gave me the money. And for much longer and to more different places than the one time I've been there before.


Gruß, masi1157

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by masi1157
Fri Feb 07, 2020 10:19 pm
Forum: Travel, Polls & Preferences
Topic: What former carriers have you flown?
Replies: 102
Views: 3336

Re: What former carriers have you flown?

AB Air Berlin 4U Germanwings (still flying, but only for EW) PA Panam HF Hapad-Lloyd Flug VG VLM Airlines NW Northwest Airlines ST Germania SR Swissair MP Martinair PV Privatair BM BMI Regional MA Malev IT Air Inter DI Deutsche BA JK Spanair MX Mexicana OL OLT UK UKAir/Buzz 9W Jet Airways DK MyTrave...

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by masi1157
Thu Jan 30, 2020 7:41 pm
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

There is no relevance to that. The idea there was to see if any of those disagreeing with me would fall for disputing science itself. "Science"? So you are saying it's not possible for anyone to conclusively say the A220 in 3B is noticeably quieter than an MD-88 or 737? No, I am not sayin...

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by masi1157
Wed Jan 29, 2020 7:47 pm
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

It all really boils down to longitudinal waves and how your brain responds to them. What is the relevance of sound being a "longitudinal wave"? The human ear basically responds to the local sound pressure. It’s all about sounds that engage your brain vs ones that don’t. If the engines are...

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by masi1157
Wed Jan 29, 2020 7:32 pm
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

Are you saying mistakes in The Points Guy article, or saying mistakes in the study? I said "article", so I am talking about the article that you linked to. But also in the study I don't find the info I would need to judge the quality of those data. Tell you what - put on an Apple Watch an...

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by masi1157
Wed Jan 29, 2020 8:25 am
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

This article sheds some light on the subject. They feature a study measuring sound on hundreds of flights with real equipment: https://thepointsguy.com/news/quietest-aircraft-in-the-sky/ Strangely my measurements with my Apple Watch are pretty close to what this study found, though I've typically b...

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by masi1157
Mon Jan 27, 2020 10:35 am
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

There is too much subjective perception. If you find one aircraft noisier or quieter than another is nothing but subjective perception. None of us is able to tell a few dB difference just from memory. Only in a direct A-B comparison we would detect a 1 dB difference. But a noise level in dB(A) says...

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by masi1157
Sun Jan 26, 2020 9:23 am
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

Completion weight allowances aren’t that large that builders and buyers can add much to the sound insulation without cutting into payload or range. A lot of reduction is in details—like around windows when they are expanded under pressurization loads, how cabin airflow is distributed, mechanical se...

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by masi1157
Sat Jan 25, 2020 6:30 pm
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

Maybe BBD did learn something about cabin noise from building bizjets—current Globals are completed with cabin noise surveys in the mid-50 dB. There is not much to learn from bizjet cabin acoustics that you could apply to a pax aircraft. Allow me the extra weight and cost penalty and I make your B7...

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by masi1157
Sat Jan 25, 2020 2:42 pm
Forum: Civil Aviation
Topic: DL A220 "Whisperjet"?
Replies: 136
Views: 18972

Re: DL A220 "Whisperjet"?

And to hear those children crying behind you? I would always prefer a flight with a continuous 70dB(A) or less with the occasional crying baby or snorring neighbour over 85dB(A) continuous background noise which would still not mask all the other sounds. The quieter the aircraft cabin, the better f...

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by masi1157
Thu Jan 09, 2020 9:53 pm
Forum: Civil Aviation
Topic: LH Group's German domestic network is massive
Replies: 126
Views: 14639

Re: LH Group's German domestic network is massive

Earliest NUE-MUC arrival time is 10:25. Ha, good point! And it seems the latest flight back leaves at 19:05 from MUC. Not exactly an alternative to the latest trains leaving around 22:00 (as we learned earlier upthread). For STR-MUC it looks a bit better. There is an early flight arriving at MUC ju...

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by masi1157
Wed Jan 08, 2020 8:19 pm
Forum: Civil Aviation
Topic: LH Group's German domestic network is massive
Replies: 126
Views: 14639

Re: LH Group's German domestic network is massive

Luckily, I had someone who could drive me... Sure, if you want or need to travel by train to or from further away from the airport, MUC is not the best choice. However, I wouldn't book a flight that I can't reach from my home by public transport. And if there is no other chance than that early morn...

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by masi1157
Wed Jan 08, 2020 8:20 am
Forum: Civil Aviation
Topic: LH Group's German domestic network is massive
Replies: 126
Views: 14639

Re: LH Group's German domestic network is massive

Munich airport in particular is poorly connected to the railway network, and early morning departures are difficult to reach because the earliest train itineraries don't arrive before ~ 07:00 h. Much easier to catch a short flight at 06:00, arrive at MUC or FRA at 06:45 and hop on your second leg a...

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by masi1157
Mon Jan 06, 2020 1:57 pm
Forum: Civil Aviation
Topic: LH Group's German domestic network is massive
Replies: 126
Views: 14639

Re: LH Group's German domestic network is massive

There is no guarantee that passengers of Deutsche Bahn will see any of that reduction in MwSt(VAT) on long distance travel despite what politicians of DB might claim. The pricing engine delivers variable fares and maximises income for DB. I booked a couple of trips before and another couple of trip...

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by masi1157
Thu Oct 24, 2019 7:08 pm
Forum: Non-Aviation
Topic: Halloween outside America
Replies: 38
Views: 6672

Re: Halloween outside America

The same here. "Allhelgona" ( All Saints' Day ) have always been the tradition in Sweden. All Saints Day ("Allerheiligen") on 1. November has forever been a holiday in the southern catholic part of Germany, but not in the north. We finally got our protestant holiday (with the 50...

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by masi1157
Thu Oct 24, 2019 6:27 pm
Forum: Non-Aviation
Topic: Halloween outside America
Replies: 38
Views: 6672

Re: Halloween outside America

Halloween exists Sweden as well, mainly as an "artificial" holiday created by retail stores and etc to get people to spend more money since there aren't any other holidays between midsummer (end of June) and christmas/jul (end of December). Quite the same here in northern Germany. When I ...

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by masi1157
Mon Oct 21, 2019 7:10 pm
Forum: Non-Aviation
Topic: Geographic places often mispronounced
Replies: 70
Views: 12066

Re: Geographic places often mispronounced

Well that's significantly off topic and a broad generalization that can easily be applied to anyone speaking a language that is not native to them. For example, Germans consistently confusing the English pronunciation of the letters "w" and "v." If you heard Germans making that ...

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by masi1157
Mon Oct 21, 2019 6:18 pm
Forum: Non-Aviation
Topic: Geographic places often mispronounced
Replies: 70
Views: 12066

Re: Geographic places often mispronounced

Pretty much every Dutch word pronounced by an American is mispronounced. That is probably true for just about every non-english word pronounced by an American. * We're well aware that The Netherlands and Sweden are entirely different countries, but to someone who speaks neither Dutch nor Swedish th...

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by masi1157
Fri Sep 13, 2019 3:52 pm
Forum: Travel, Polls & Preferences
Topic: Noise level of ERJ jets.
Replies: 6
Views: 668

Re: Noise level of ERJ jets.

While in the A319 you can mostly hear the engines, in the 175 or 190 it is mostly aerodynamic noise. Especially if you're seated in front of the engines. There is virtually no engine noise on an A319 in cruise. It is almost exclusively boundary layer noise (with a bit of air cond) in front of the w...

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by masi1157
Sun Sep 01, 2019 7:52 pm
Forum: Technical/Operations
Topic: 777W in cruise - noisy on ground?
Replies: 22
Views: 5232

Re: 777W in cruise - noisy on ground?

The GE90-115 being the most powerfull engine by a significant margin, could it be that due to its intrinsically high air flow, the noise resulting from the jet mixing is simply higher than for any other engine? Also, has the exhaust speed any effect on the low frequency noises? Of course a more pow...

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by masi1157
Sat Aug 31, 2019 6:49 pm
Forum: Technical/Operations
Topic: 777W in cruise - noisy on ground?
Replies: 22
Views: 5232

Re: 777W in cruise - noisy on ground?

I have always thought the RR powered -200ER was really noisy in the cabin, even forward of the L2 door. Sounds like a buzz saw and quite unpleasent at times. That is called buzzsaw noise (really!) and I am perfectly sure it occurs during climb (on all aircraft, some noisier, some less) but not duri...

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by masi1157
Sat Aug 31, 2019 6:12 pm
Forum: Technical/Operations
Topic: 777W in cruise - noisy on ground?
Replies: 22
Views: 5232

Re: 777W in cruise - noisy on ground?

I agree with you, compared to 772 (PW4077), 77E (RR Trent 892) and 773 (RR Trent 892) I have flown with the 77W is more noisy in the cabin. Being noisier in the cabin does not necessarily mean it is also noisier when heard from the ground. It may be a hint, but it surely is not related 1 to 1. Perh...

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by masi1157
Sat Aug 31, 2019 8:05 am
Forum: Technical/Operations
Topic: 777W in cruise - noisy on ground?
Replies: 22
Views: 5232

Re: 777W in cruise - noisy on ground?

If you are talking about a 77W at FL310 the A330/A350/A380 would be at FL370 at the same corresponding fraction of actual weight/MTOW. At MTOW a 77W will only get to FL290 normally, the A350 straight to FL350. That would give 1.2dB and 1.6dB difference. As I said, still below 2dB and inaudible if n...

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by masi1157
Fri Aug 30, 2019 3:14 pm
Forum: Technical/Operations
Topic: 777W in cruise - noisy on ground?
Replies: 22
Views: 5232

Re: 777W in cruise - noisy on ground?

I guess its an inverse square law thing (been 11 years since I did the acoustics at uni) so (37/33)^(1/2) = 1.058. Not sure how that equates to dB but I'm sure you are right. It is not "^(1/2)" but simply "^2". And the sound pressure level difference is 10*log((37/33)^2) or 20*l...

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by masi1157
Fri Aug 30, 2019 9:12 am
Forum: Technical/Operations
Topic: 777W in cruise - noisy on ground?
Replies: 22
Views: 5232

Re: 777W in cruise - noisy on ground?

It may well be louder because its lower and therefore closer to you. Flying at FL330 instead of say FL370 would make a 1dB difference. That is the smallest noise difference to distinguish in a direct comparison. But hearing them several minutes/hours/days apart you would not be able to notice any d...

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by masi1157
Tue Aug 13, 2019 7:37 am
Forum: Technical/Operations
Topic: Hydraulic reservoir pressurization/ cavitation?
Replies: 22
Views: 3143

Re: Hydraulic reservoir pressurization/ cavitation?

What happens at the expansion valve is cavitation I would not call it cavitation but rather vaporization: The fluid, all the fluid, turns into a gas and stays a gas for a while. But it does not have the local and very explosive and destructive formation and collapse of gas bubbles inside the fluid....

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by masi1157
Mon Aug 12, 2019 7:09 pm
Forum: Technical/Operations
Topic: Hydraulic reservoir pressurization/ cavitation?
Replies: 22
Views: 3143

Re: Hydraulic reservoir pressurization/ cavitation?

On aircraft where air is used to pressurize the reservoir, we measure and regulate air pressure, not hydraulic pressure, in terms of head pressure. In a way you control both simultaneously. What you want to achieve is a certain pressure in the fluid on the low pressure side of the system. What you ...

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by masi1157
Mon Aug 12, 2019 7:42 am
Forum: Technical/Operations
Topic: Hydraulic reservoir pressurization/ cavitation?
Replies: 22
Views: 3143

Re: Hydraulic reservoir pressurization/ cavitation?

In an aircraft hydraulic system, we refer to head pressure as the air pressure in the reservoir. Which is of course the same as the pressure of the hydraulic fluid in the reservoir. Lower pressure means lower boiling temperature, so I think temperature may still the cause of the boiling. Don't thin...

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by masi1157
Wed Jul 31, 2019 9:59 am
Forum: Travel, Polls & Preferences
Topic: Multi-Airport-Cities: Which have you landed/departed at more than one airport?
Replies: 93
Views: 5957

Re: Multi-Airport-Cities: Which have you landed/departed at more than one airport?

Hamburg: HAM, XFW, LBC (well, at least Ryanair called it Hamburg) Berlin: TXL, SXF, THF (now closed) London: LHR, LGW, LTN, STN Paris: CDG, ORY Reykjavik: KEF, RKV Tenerife: TFS, TFN New York: JFK, EWR Buenos Aires: EZE, AEP And a few "current and former" airports: München: MUC (Erding) an...

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by masi1157
Mon Jul 22, 2019 11:24 am
Forum: Civil Aviation
Topic: Icelandair / Air Iceland Connect using Dash 8 "transatlantic"
Replies: 54
Views: 11562

Re: Icelandair / Air Iceland Connect using Dash 8 "transatlantic"

I think it must one of the last adventures and challenges to do such flights on such a plane over water for such a long time...is that the longest route of a Dash 8 Q 400? Air Iceland operates quite a number of flights from RKV to west Greenland, some of them even with Dash8-200. Those are over wat...

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by masi1157
Sun Jul 21, 2019 10:20 am
Forum: Technical/Operations
Topic: Recirc Fans/ engine start
Replies: 9
Views: 2313

Re: Recirc Fans/ engine start

You often hear the cabin ventilation go silent before engine start so that would suggest that they are off. That doesn't mean the cabin fans are off. Turning off the packs would leave the cabin fans blowing 1/2 of the air into the cabin, which would reduce the flow noise by (theoretically) 18dB. An...

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by masi1157
Fri Jul 05, 2019 3:46 am
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1914

Re: Jet buzzsaw noise

What is fan & N1 shaft imbalance? What do you not understand here? The fan is sitting on the N1 shaft, so they both rotate at the same frequency. An imbalance of the fan or the shaft and the inhomogenuous flow condition across the fan inlet introduce a vibration at that same frequency, that is ...

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by masi1157
Thu Jul 04, 2019 7:40 pm
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1914

Re: Jet buzzsaw noise

It was an answer to your post immediately before it. The imbalance of the fan and shaft also have (of course) the same fundamental frequency as buzzsaw noise would have, but the generating mechanism is completely different. Other than the frequency it has nothing to do with it.


Gruß, masi1157

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by masi1157
Thu Jul 04, 2019 4:13 pm
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1914

Re: Jet buzzsaw noise

Engine fan and N1 shaft imbalance, it has nothing to do with buzzsaw noise.


Gruß, masi1157

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by masi1157
Wed Jul 03, 2019 8:15 pm
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1914

Re: Jet buzzsaw noise

[but what is the mechanism of producing energy at higher than BPF from shocks? There probably is one, but either way the acoustic energy of harmonics above BPF is much lower than that at BPF or 1/rev or 2/rev. The 1000th engine order is not of much interest generally. The mechanism is simply from t...

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by masi1157
Wed Jul 03, 2019 6:14 pm
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1914

Re: Jet buzzsaw noise

That’s exactly what I said. “And its harmonics up to blade passing frequency” You said "also". Only the shaft frequency and its harmonics are created by supersonic blade tip speed and are perceived as buzzsaw noise. And the harmonics of the shaft frequency reach far beyond the BPF. Gruß, ...

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