## Search found 928 matches

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Wed Jul 03, 2019 6:39 pm
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1753

### 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, ...

Wed Jul 03, 2019 4:07 pm
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1753

### Re: Jet buzzsaw noise

It is not "also" at shaft frequency, it is only at shaft frequency and many many of its harmonics. You can also have a pronounced peak at the blade passing frequency, but that one doesn't disappear at cruise level. It might just get less pronounced. Gruß, masi1157 That’s exactly what I sa...

Wed Jul 03, 2019 2:12 pm
Forum: Technical/Operations
Topic: Jet buzzsaw noise
Replies: 17
Views: 1753

### Re: Jet buzzsaw noise

You are both right, the buzzsaw noise is due to shocks with a tip Mach number greater than unity but is also at shaft frequency and it’s harmonics up to blade passing frequency. See my post from a long time ago about this https://www.airliners.net/forum/viewtopic.php?f=5&t=775259&p=11182623#...

Mon Jun 17, 2019 2:39 pm
Forum: Non-Aviation
Topic: Graphing calculators
Replies: 16
Views: 1794

### Re: Graphing calculators

The old joke is that we should peg our currencies to the price of the TI-83, it’s been \$100 for decades now.

After high school I have never used my graphing calculator in college or now in grad school. Either everything is symbolic or when I am doing numerical anything it’s in Matlab.

Sat Apr 06, 2019 5:41 pm
Forum: Technical/Operations
Topic: Neo vs Ceo cockpit differences
Replies: 9
Views: 1982

### Re: Neo vs Ceo cockpit differences

What is dual cool theoretically supposed to do?

Thu Mar 14, 2019 8:38 pm
Forum: Technical/Operations
Topic: Is there a problem with Boeing’s engineering team?
Replies: 33
Views: 3785

### Re: Is there a problem with Boeing’s engineering team?

I wouldn't be at all surprised if in 50 years some old engineer writes a tell-all about how they raised concerns to management and those concerns were promptly ignored. Management of large engineering projects have long histories of ignoring on the ground engineers for the sake of meeting some goal ...

Wed Mar 06, 2019 9:59 pm
Forum: Non-Aviation
Topic: Imperial System
Replies: 230
Views: 8805

### Re: Imperial System

Tugg, There are issues though, and metric solves them much better. Newtons vs Pound-force 1 Liter of water weighs 1 KG At what pressure and temperature :) This relationship is not definitionally true anymore, although 1L of water is very close to 1Kg. The kilogram was defined in 1795 as the weight ...

Wed Mar 06, 2019 9:48 pm
Forum: Non-Aviation
Topic: Imperial System
Replies: 230
Views: 8805

### Re: Imperial System

This is not true. All base SI units will be based off of exact values of physical constants in the universe (the kilogram and a few others are switching definition on May 20th 2019). The meter is defined off the distance the speed of light travels in a certain amount of time (and the second itself ...

Wed Mar 06, 2019 8:55 pm
Forum: Non-Aviation
Topic: Imperial System
Replies: 230
Views: 8805

### Re: Imperial System

I love this discussion. I see little value in switching to the metric system as conversion is easy (especially nowadays). Also thought metric supporters claim it is "scientific" it really isn't anymore so really than imperial. It is just based on a different set base of measurement. The m...

Wed Feb 27, 2019 4:05 pm
Forum: Non-Aviation
Topic: Repub. Rep warns Cohen
Replies: 64
Views: 4252

### Re: Repub. Rep warns Cohen

apodino wrote:
Can a legal expert weigh in on here for me? How does Cohens testimony not violate attorney client privilege?

He’s already been disbarred so what else does he have to lose? Is violating attorney client privilege actually a crime? Not as far as I know but I’m no expert.

Thu Feb 07, 2019 4:02 am
Forum: Technical/Operations
Topic: PAE An-124 Spoolup
Replies: 10
Views: 2244

### Re: PAE An-124 Spoolup

Maybe taxi out/delays were shorter than expected and they needed to get down to MTOW? If you need to burn fuel fast, TO power is your best bet and probably not too many places you can throttle up near a runway besides the runway itself.

Mon Feb 04, 2019 8:35 pm
Forum: Technical/Operations
Topic: Trent 772B-60
Replies: 5
Views: 1025

### Re: Trent 772B-60

You are almost certainly not going to find any dimensions beyond the fan diameter. Such things are pretty tightly guarded intellectual property of the engine companies.

Mon Jan 07, 2019 11:42 pm
Forum: Technical/Operations
Topic: Flight school bias toward carrier contract students
Replies: 29
Views: 1954

### Re: Flight school bias toward carrier contract students

Wait I thought all of us millennials were idiots because we were doing useless college degrees like history or French literature? Remind me which branch of uselessness and stupidity I’m in again? Why don't you remind us? https://www.youtube.com/watch?v=RGvrmltfMrA Cute. Whatever it takes to feed yo...

Mon Jan 07, 2019 9:05 pm
Forum: Technical/Operations
Topic: Flight school bias toward carrier contract students
Replies: 29
Views: 1954

### Re: Flight school bias toward carrier contract students

Stupid server errors and duplicate posts. It would be nice if we could drag the forum software into the 21st century tbh.

Mon Jan 07, 2019 8:05 pm
Forum: Technical/Operations
Topic: Flight school bias toward carrier contract students
Replies: 29
Views: 1954

### Re: Flight school bias toward carrier contract students

I flew with one who seriously asked me, after pointing out the D-Day beaches below, “now, why were the Germans in France?” That’s the state of education today. GF Wait I thought all of us millennials were idiots because we were doing useless college degrees like history or French literature? Remind...

Mon Jan 07, 2019 8:05 pm
Forum: Technical/Operations
Topic: Flight school bias toward carrier contract students
Replies: 29
Views: 1954

### Re: Flight school bias toward carrier contract students

I flew with one who seriously asked me, after pointing out the D-Day beaches below, “now, why were the Germans in France?” That’s the state of education today. GF Wait I thought all of us millennials were idiots because we were doing useless college degrees like history or French literature? Remind...

Fri Dec 21, 2018 9:49 pm
Forum: Non-Aviation
Topic: US Government Shutdown Likely
Replies: 127
Views: 6024

### Re: US Government Shutdown Likely

GalaxyFlyer wrote:
Essential services Will. Be. Paid. Shutdown or no shutdown, as will most government workers and pensioners, etc. It’s all a show.

Gf

They get paid eventually. Not while the government is shutdown, just weeks or months afterwords.

Mon Dec 17, 2018 8:07 pm
Forum: Non-Aviation
Topic: Trumps approval rating at 61%, 80% would re vote for him
Replies: 35
Views: 2206

### Re: Trumps approval rating at 61%, 80% would re vote for him

Early Iowa primaries are a good indication of how things go as a nation. These numbers indicate a landslide in 2020 for Trump. In... the primary? Do you understand any of this? I've always wondered that with your posts... a very sophisticated troll job or just someone who doesn't understand much. C...

Tue Nov 20, 2018 1:57 am
Forum: Non-Aviation
Topic: Shooter(s) Now in Mercy Hospital in Chicago
Replies: 46
Views: 1913

### Re: Shooter(s) Now in Mercy Hospital in Chicago

We don't want to be Europe why can't you get that through your skulls? Since when do you get to speak for everyone in the US? And given that 61% of Americans favor stricter gun control laws, we do want to become more European in this regard. https://news.gallup.com/poll/1645/guns.aspx i dont speak ...

Tue Nov 20, 2018 12:59 am
Forum: Non-Aviation
Topic: Shooter(s) Now in Mercy Hospital in Chicago
Replies: 46
Views: 1913

### Re: Shooter(s) Now in Mercy Hospital in Chicago

If only we were more European minded in this regard these things wouldn't happen. Dark ages. We don't want to be Europe why can't you get that through your skulls? Since when do you get to speak for everyone in the US? And given that 61% of Americans favor stricter gun control laws, we do want to b...

Thu Nov 15, 2018 9:56 pm
Forum: Non-Aviation
Topic: Avenatti arrested for domestic violence
Replies: 80
Views: 4044

### Re: Avenatti arrested for domestic violence

Super80Fan wrote:
The left: Justice Kavanaugh is an evil serial rapist who locks women up in his torture basement.
Also the left: Avenatti is innocent! This was a setup by the right! We believe him!

As evidenced by multiple posters calling for an investigation of Avenatti? Just like we did for Kavanaugh?

Thu Nov 15, 2018 9:51 pm
Forum: Non-Aviation
Topic: A rant about the Las Vegas hospitality industry
Replies: 32
Views: 2743

### Re: A rant about the Las Vegas hospitality industry

When they charge your credit card, deny the charge and tell them that their charge is simply a "request for payment" and see how well they like that!

Thu Nov 15, 2018 12:47 am
Forum: Non-Aviation
Topic: Avenatti arrested for domestic violence
Replies: 80
Views: 4044

### Re: Avenatti arrested for domestic violence

Pyrex wrote:
#believeallvictims

That's how this works, right?

Yes. There should be an investigation and a trial and if he is found guilty he should go to jail just like anyone else.

Fri Nov 02, 2018 7:54 pm
Forum: Non-Aviation
Topic: Tanzania to hunt down gays
Replies: 92
Views: 4478

### Re: Tanzania to hunt down gays

I am not. Being homosexual will not see ypu imprisoned or executed in Europe, North, Central or Southern America. Or Australasia. Just wondered why homosexuality is illegall in nearly all African and Asian nations. You literally ignored the argument I made. My point is that the rest of the world wa...

Fri Nov 02, 2018 6:36 pm
Forum: Non-Aviation
Topic: Tanzania to hunt down gays
Replies: 92
Views: 4478

### Re: Tanzania to hunt down gays

How was it in Africa BEFORE colonialism and missionary work? Do we know? Are there any records? https://en.m.wikipedia.org/wiki/History_of_homosexuality#Africa The demographics and culture of Egypt, and northern Africa in general, are completely different than that of antiquity. Not really a fair c...

Fri Nov 02, 2018 5:52 pm
Forum: Non-Aviation
Topic: Tanzania to hunt down gays
Replies: 92
Views: 4478

### Re: Tanzania to hunt down gays

But the same religions are practised in Europe and South America. Not illegal there Because higher economic conditions and education gave birth to secular social advancement. You think that Europe or North America is somehow special? They were right where Africa is now only a hundred years ago or l...

Fri Nov 02, 2018 5:34 pm
Forum: Non-Aviation
Topic: Tanzania to hunt down gays
Replies: 92
Views: 4478

### Re: Tanzania to hunt down gays

Why are African nations so intollerant of homosexuality? Really is primative thinking. Because religion taught them to be so. But the same religions are practised in Europe and South America. Not illegal there Because higher economic conditions and education gave birth to secular social advancement...

Fri Nov 02, 2018 5:29 pm
Forum: Non-Aviation
Topic: Tanzania to hunt down gays
Replies: 92
Views: 4478

### Re: Tanzania to hunt down gays

https://en.m.wikipedia.org/wiki/History ... ity#Africa
-->

Dieuwer wrote:
How was it in Africa BEFORE colonialism and missionary work? Do we know? Are there any records?

https://en.m.wikipedia.org/wiki/History ... ity#Africa

Fri Nov 02, 2018 3:13 pm
Forum: Non-Aviation
Topic: Tanzania to hunt down gays
Replies: 92
Views: 4478

### Re: Tanzania to hunt down gays

noviorbis77 wrote:
Why are African nations so intollerant of homosexuality?

Really is primative thinking.

Because religion taught them to be so.

Fri Nov 02, 2018 12:48 pm
Forum: Non-Aviation
Topic: Tanzania to hunt down gays
Replies: 92
Views: 4478

### Re: Tanzania to hunt down gays

The religious right in this country has put a lot of effort into "outreach," which translates into supporting and educating haters in African countries to criminalize and even execute gay people for doing nothing more than being gay. Please provide a source for your ridiculous claim. http...

Tue Oct 30, 2018 5:22 pm
Forum: Non-Aviation
Topic: Trump to attack Trans community ... again
Replies: 125
Views: 5791

### Re: Trump to attack Trans community ... again

Oh. I thought I had agreed to stop doing that very thing in respect to another persons objections. What is a pot-ah-to in the context of your last sentence? Please expand on your thoughts in regards to both of your statements. I thought the article was interesting history of changing human percepti...

Tue Oct 30, 2018 2:46 pm
Forum: Non-Aviation
Topic: Stocks sheds all 2018 gains, 600 points today
Replies: 213
Views: 25498

### Re: Stocks sheds all 2018 gains, 600 points today

Hopefully the whole economy collapses so we can laugh at Trump for being such an idiot. Only an idiot would wish everyone pain by the economy collapsing just because they hate Trump so bad. Talk about cut your own nose off to spite your face. I agree it's idiotic to wish ill on others for personal ...

Mon Oct 29, 2018 11:34 pm
Forum: Technical/Operations
Topic: Core engine speeds
Replies: 6
Views: 1995

### Re: Core engine speeds

The GTF lets the low pressure compressor and turbine spin faster while letting the fan spin slower, the high pressure compressor and turbine are on a different shaft and can spin as fast as they need to. If I recall the GTF is 3 to 1 gear ratio. The CFM-56 has a 100% N1 of about 5200 RPM [1] and the...

Mon Oct 29, 2018 10:26 pm
Forum: Non-Aviation
Topic: Pittsburgh synagogue shooting leaves multiple people dead and wounded
Replies: 55
Views: 5674

### Re: Pittsburgh synagogue shooting leaves multiple people dead and wounded

I get what you’re saying but you weren’t shot at, those bullets were not targeting you, you were in the wrong place at the wrong time. Scary as hell but it you were hit it would have been accidental. Irrelevant. Most of the people in Vegas and Orlando never saw the shooter, either. The guy in Vegas...

Mon Oct 29, 2018 12:23 am
Forum: Non-Aviation
Topic: Trump to attack Trans community ... again
Replies: 125
Views: 5791

### Re: Trump to attack Trans community ... again

That is so true. What bothers me is that I am suppose to celebrate and embrace LGBT disorders as wholesome and normal and that I am labeled as a Homophobe, Curmudgeon, Prejudiced and worse when I find those disorders revolting. Another persons sexuality is none of my business and as long as a perso...

Sun Oct 28, 2018 8:04 pm
Forum: Non-Aviation
Topic: Trump to attack Trans community ... again
Replies: 125
Views: 5791

### Re: Trump to attack Trans community ... again

Being gay is completely different than thinking you’re a woman in a mans body, why mix them up? Because LGBTQ+ are accepting If you really believe that "who cares as long as everyone is consenting adults" You don’t speak for every LGB person, I’d put money on it that not all are happy to ...

Sun Oct 28, 2018 5:11 am
Forum: Non-Aviation
Topic: Trump to attack Trans community ... again
Replies: 125
Views: 5791

### Re: Trump to attack Trans community ... again

If you truly think that homosexuality is a disorder, perhaps you could explain how it can be treated. Google is your friend. You don't have to wait for someone on a forum to tell you. You say this frequently and it is the most intellectually lazy response imaginable. If you make a claim, it is your...

Sun Oct 28, 2018 1:45 am
Forum: Non-Aviation
Topic: Trump to attack Trans community ... again
Replies: 125
Views: 5791

### Re: Trump to attack Trans community ... again

Folks spend way to much time worrying about other people’s sexual preferences. Live and let live. That is so true. What bothers me is that I am suppose to celebrate and embrace LGBT disorders as wholesome and normal and that I am labeled as a Homophobe, Curmudgeon, Prejudiced and worse when I find ...

Mon Sep 17, 2018 2:35 pm
Forum: Non-Aviation
Topic: Manafort Pleading Guilty and Talking
Replies: 84
Views: 3093

### Re: Manafort Pleading Guilty and Talking

What kind of man just happens to have a whole bunch of letters from women saying he is a great guy? Just laying around? Think about it. Who does that? And that tells you all you need to know, he went to Georgetown Prep for Boys (no chicks at all), he didn’t even know 6 girls let alone 65. Unless th...

Mon Aug 27, 2018 11:47 pm
Forum: Non-Aviation
Topic: US boy, 9, killed himself after homophobic bullying.
Replies: 57
Views: 2778

### Re: US boy, 9, killed himself after homophobic bullying.

Is it really realistic for a 9 years old human individual to develop established thoughts about their own sexual desire, let alone realizing their own sexual orientation? For some sure. By 4th grade I was already forcing myself to have crushes on girls to lie to myself about my homosexuality. Some ...

Thu Aug 16, 2018 2:10 am
Forum: Technical/Operations
Topic: Is flying without a working PA system allowed by FAA?
Replies: 11
Views: 2270

### Re: Is flying without a working PA system allowed by FAA?

ual763 wrote:
Half the time the PA is so quiet, you can’t hear it, or make out what they say anyways.

Simultaneously, if you have the headphones plugged into the IFE to watch a movie, the PA pauses the movie AND IS SO LOUD

Fri Jul 27, 2018 7:57 pm
Forum: Non-Aviation
Topic: The Correct Transit System
Replies: 47
Views: 1913

### Re: The Correct Transit System

Oslo has the best transit system by far that I’ve seen

Sat Jul 14, 2018 12:50 pm
Forum: Non-Aviation
Topic: Scotland's National Newspaper: Trump is "Appalling Human Being"
Replies: 28
Views: 1345

### Re: Scotland's National Newspaper: Trump is "Appalling Human Being"

And yet his polling remains quite solid. It’s almost as if these things don’t really matter to most people. You realize he’s still the least popular president with a net approval rating of -10.8 right? The only reason it’s that high is that he is still riding the economic high that was hands to him...

Wed Jul 11, 2018 2:44 pm
Forum: Technical/Operations
Topic: Can you tell what engine a plane is using just by looking at it?
Replies: 26
Views: 2878

### Re: Can you tell what engine a plane is using just by looking at it?

kurtverbose wrote:
How do you distinguish them on the 787 - they look almost exactly the same?

If the engines aren't running you can tell because GEnX has titanium leading edges on the fan and RR does not. Running, I am not sure if you really can in any easy way.

Sun Jul 08, 2018 4:04 pm
Forum: Technical/Operations
Topic: Reason for 5 flaptrack canoes on the 777x
Replies: 2
Views: 1033

### Re: Reason for 5 flaptrack canoes on the 777x

I would also imagine that marketing materials are not sweating technical accuracy for something so specific. I have seen many marketing materials from engine companies which have obvious technical errors (copy/pasted/scales blades, blades going the wrong way etc).

Tue Jun 26, 2018 4:53 pm
Forum: Non-Aviation
Topic: When/why did US immigration stop having a separate line for citizens and green card holders?
Replies: 7
Views: 935

### Re: When/why did US immigration stop having a separate line for citizens and green card holders?

Cleared yesterday at Boston. Definitely had a line for US citizen/greencard. Not sure if it was any faster though, still took 1.5 hours with the stupid machines that take your picture and what not. Compare on the outbound, it took me ~15 minutes to clear Norwegian passport control and customs as a U...

Fri Jun 22, 2018 2:26 am
Forum: Technical/Operations
Topic: Gear Before Flaps::PHL to CMH
Replies: 20
Views: 3248

### Re: Gear Before Flaps::PHL to CMH

ojjunior wrote:
stratclub wrote:
On short flights could gear down first help cool the tires and brakes?

But as a concept yes, it does. Speed is always a cooling system, see your car intakes.

The SR-71 and Apollo capsule wants a word with you on that one...

Thu May 03, 2018 3:57 pm
Forum: Technical/Operations
Topic: Is there a minimum "rest" time for an aircraft?
Replies: 55
Views: 6734

### Re: Is there a minimum "rest" time for an aircraft?

Usually the limiting factor is not related to the limitations of the airplane - it is the time for passengers to deplane and board - and passengers just don't move with a sense of urgency. My first airline scheduled 10 minute turns at the outstation - 20 minutes at the hub. The fastest we were able...

Tue Apr 24, 2018 1:08 am
Forum: Technical/Operations
Topic: Any hope for "different" designs?
Replies: 17
Views: 1934

### Re: Any hope for "different" designs?

NASA has run the N+3 program looking for future concepts of civilian airliners from 3 groups (Boeing, Northrop Grumman, and MIT/Aurora). I am most familiar with the MIT submission as the program was run out of the lab I am in. You can find more info on it below. It is pretty different from current d...

Tue Mar 06, 2018 2:54 pm
Forum: Technical/Operations
Topic: Runway question - BOS
Replies: 3
Views: 671

### Re: Runway question - BOS

I believe Cape Air uses it somewhat frequently for all their cessna twins that make the runs to Martha's Vineyard, Nantucket etc.

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