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by WIederling
Mon Sep 24, 2018 5:46 pm
Forum: Non-Aviation
Topic: If the USSR were still around...
Replies: 52
Views: 1833

Re: If the USSR were still around...

tommy1808 wrote:
But the low cost Colani Truck is cool.


I'd have more liked to have seen the Steinwinter solution produced.
... and then work the tractor unit as a heavy duty racing car.:-)

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by WIederling
Mon Sep 24, 2018 5:38 pm
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3060
Views: 363600

Re: Boeing 797 Discussion Thread - 2018

That wouldn’t work, the fuselage will always try to become circular in total for the cross section, having two or more circular sections will not remove the fact that the whole thing is not a single circle. Can’t have your cake and eat it too. It works as long as you insert a "stiffener" ...

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by WIederling
Mon Sep 24, 2018 3:12 pm
Forum: Technical/Operations
Topic: Is fewer fan blades better?
Replies: 4
Views: 295

Re: Is fewer fan blades better?

Why can't just use one blade, like an Archimedic spiral? propellers and fans, water screws and such each are the simplification/reduction to minimum of the archimedic spiral. single blade helo: https://en.wikipedia.org/wiki/B%C3%B6lkow_Bo_103 abstract: https://en.wikipedia.org/wiki/Monocopter wind ...

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by WIederling
Mon Sep 24, 2018 3:00 pm
Forum: Non-Aviation
Topic: If the USSR were still around...
Replies: 52
Views: 1833

Re: If the USSR were still around...

https://cdn.iz.ru/sites/default/files/styles/900x600/public/photo_list-2017-05/8f72244b4f25b1d1c195ea71be38d1b9.jpg?itok=qt6y6x3X https://s3-eu-west-1.amazonaws.com/files.surfory.com/uploads/2016/2/3/543e9f481f395daf0c8b4567/56b1f0ffbd0470ba4f8b4569.jpg http://www.autoforum.cz/tmp/magazin/m9/maz-20...

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by WIederling
Mon Sep 24, 2018 2:00 pm
Forum: Non-Aviation
Topic: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes
Replies: 48
Views: 1216

Re: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes

As a person paying for a mortgage, I can say: at the moment I have a mortgage for 25 years, at ~15% per annum, payments for which are ~$335 dollars per month (this is about 33% of my monthly salary). And this is about the same as it cost me rent in Moscow. I've hear some rumor that (some, lots? ) R...

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by WIederling
Mon Sep 24, 2018 1:57 pm
Forum: Non-Aviation
Topic: If the USSR were still around...
Replies: 52
Views: 1833

Re: If the USSR were still around...

KLDC10 wrote:
Those cars look like heaps of badly-designed, poorly-constructed crap. I don't think the world missed out on anything there.


US car manufacturers weren't so kind as to not produce their design mishaps.

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by WIederling
Mon Sep 24, 2018 1:45 pm
Forum: Military Aviation & Space Flight
Topic: Germany Considers Tornado Replacement
Replies: 930
Views: 85639

Re: Germany Considers Tornado Replacement

https://www.zeit.de/politik/deutschland ... ung-panzer
article published April 2018
-->

Planeflyer wrote:
What are current readiness rates for German Tornados?


Tornado
Luftwaffe
Voll einsatzfähig: 28 von 74 (38 %)
2014: 36 von 66 (55 %)
https://www.zeit.de/politik/deutschland ... ung-panzer
article published April 2018

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by WIederling
Mon Sep 24, 2018 1:19 pm
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3060
Views: 363600

Re: Boeing 797 Discussion Thread - 2018

" .. One solution is to insert vertical rods inside the tube, adding strength but not too much weight. .." That would partition the hold into symmetric halves. LD3-45 would not fit at all. IMU you are stuck with a "floor beams in compression" solution. ( if that actually is a vi...

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by WIederling
Mon Sep 24, 2018 12:52 pm
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3060
Views: 363600

Re: Boeing 797 Discussion Thread - 2018

" .. One solution is to insert vertical rods inside the tube, adding strength but not too much weight. .." That would partition the hold into symmetric halves. LD3-45 would not fit at all. IMU you are stuck with a "floor beams in compression" solution. ( if that actually is a via...

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by WIederling
Mon Sep 24, 2018 11:46 am
Forum: Civil Aviation
Topic: How come quads outlasted trijets?
Replies: 56
Views: 9990

Re: How come quads outlasted trijets?

"And this is also why the later DC-10 variants had that center gear, to spread and carry the weight a bit more evenly. So this is at least a concern with trijets that doesn't exist with quads or twins." The A340 has a third (middle) MLG leg too. But "not taking the forces for a walk&q...

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by WIederling
Mon Sep 24, 2018 11:32 am
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3060
Views: 363600

Re: Boeing 797 Discussion Thread - 2018

There is a buzz in the industry similar to the launch of the Dreamliner. Everybody wants in on the 797, as they know it is the next big thing. Has anyone amassed riches ( or even just made an overall profit ) from being on the 787, the Last Big Thing? IMU the next Big Boeing Project is still in the...

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by WIederling
Mon Sep 24, 2018 8:23 am
Forum: Non-Aviation
Topic: What ever happened to the new presidential limo ?
Replies: 19
Views: 1258

Re: What ever happened to the new presidential limo ?

https://en.wikipedia.org/wiki/Mercedes-Benz_W186 ( 1951 )
-->

Is it multifuel or can the Secret Service still sabotage it by way of filling up with petrol ? :-)

"height adjustable chassis".
Very Modern:
https://en.wikipedia.org/wiki/Mercedes-Benz_W186 ( 1951 )

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by WIederling
Sun Sep 23, 2018 5:10 pm
Forum: Technical/Operations
Topic: Engine over the fuselage question
Replies: 38
Views: 2363

Re: Engine over the fuselage question

Starlionblue wrote:
Agreed with the above posters.

If aesthetics was the defining factor, the Super VC-10 would still be king. :D


How aesthetically satisfying was servicing the inner engines?
( probably a major win versus the Comet, right? ;-)

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by WIederling
Sun Sep 23, 2018 10:44 am
Forum: Civil Aviation
Topic: China’s high-speed trains are finally coming to Hong Kong, posing threat to HK aviation?
Replies: 46
Views: 7030

Re: China’s high-speed trains are finally coming to Hong Kong, posing threat to HK aviation?

neutrino wrote:
lydh wrote:
China's high-speed trains are ratchet, pretty sure I'd pay extra to be on a plane.

Are you speaking from experience or extrapolating from hearsay?


NIH, He does not have it at home. Must be bad :-)

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by WIederling
Sun Sep 23, 2018 9:10 am
Forum: Civil Aviation
Topic: How come quads outlasted trijets?
Replies: 56
Views: 9990

Re: How come quads outlasted trijets?

Someone above mentioned the A300.... Can anyone explain to me why the A300 didn't seem to do anywhere near as well as the 767? I know the A300 came out first, but what made the 767 more successful? I know it was early off in the game for Airbus, did that have anything to do with it? My understandin...

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by WIederling
Sun Sep 23, 2018 8:48 am
Forum: Technical/Operations
Topic: What exactly is the fuel-inerting system on 747's?
Replies: 23
Views: 1769

Re: What exactly is the fuel-inerting system on 747's?

A very interesting read: https://www.scribd.com/document/287049556/B767-ATA-47-Student-Book According to the linked document, the NGS system works with a maintained air temperature (170F) delivered to the ASM's (Air Separation Modules) that is well above the flash point of Jet A fuel which accordin...

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by WIederling
Sun Sep 23, 2018 8:39 am
Forum: Technical/Operations
Topic: Engine over the fuselage question
Replies: 38
Views: 2363

Re: Engine over the fusulage

Starlionblue wrote:
I call it the "dreaded" VFW-614 because I find it hideous. It's a joke and I've been making the same joke for years on this site.


It is "form follows function" esthetics. You lack in taste :-)))))

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by WIederling
Sun Sep 23, 2018 8:35 am
Forum: Technical/Operations
Topic: Engine over the fuselage question
Replies: 38
Views: 2363

Re: Engine over the fuselage question

Can the Triumph's success be judged by the fact that the picture shows it on pylons rather than in operation? I am always surprised when engineers delve into the misattribution box. .... The flight test program was completed and confirmed the targeted performance. The financial situation of Beech a...

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by WIederling
Sat Sep 22, 2018 6:00 pm
Forum: Non-Aviation
Topic: From Russia with true vol. 2
Replies: 500
Views: 11786

Re: From Russia with true vol. 2

You mistyped "Trump". Trump hasn't invaded anywhere, yet .. . :D That was not in the description. You wrote this: If you peel behind the veneer of posturing, blustering and blundering that Putin is doing on the world's stage, you'll find a deeply insecure man who is dragging his country d...

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by WIederling
Sat Sep 22, 2018 12:59 pm
Forum: Non-Aviation
Topic: If the USSR were still around...
Replies: 52
Views: 1833

Re: If the USSR were still around...

What's ROFL here? For people in White House Situation Room this isn't ROFL at all BTW. It's geopolitical reality. I can't help you if you can't see that making such an empty threat is hilarious. Why is it an empty threat? Because the very action of Russia pressing that button immediately guarantees...

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by WIederling
Sat Sep 22, 2018 12:12 pm
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3060
Views: 363600

Re: Boeing 797 Discussion Thread - 2018

So they built A350 Mk1 and it was a successful program and then Launched 350XWB later? I'm sure they used the work they were doing on Mk1 for XWB. They just then had to inflate the Fuselage a bit.... The A350Mk1 was to be a rewinged A330, the fuselage dominated by Al-Li use. Like the A310 was a rew...

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by WIederling
Sat Sep 22, 2018 11:57 am
Forum: Non-Aviation
Topic: Thr correct number of inches is . . .
Replies: 47
Views: 1121

Re: Thr correct number of inches is . . .

fuel is sold in metric...... IMU that was a "being cheap" step. .. at the start of the 80ties. back then the (mechanical) meters at the pump only had pound fractions ( limit 99p ) When the gallon ( 4.54l) price started to hug the pound line metering was changed to l. ( and you were back t...

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by WIederling
Sat Sep 22, 2018 11:26 am
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3060
Views: 363600

Re: Boeing 797 Discussion Thread - 2018

I accept 6-8 years is reasonable (especially if focused on not making the worst mistakes of the 787 & A350). Please what mistakes are there with the XWB? I think the big bubu on the A350 program was the fact that they had to throw the initial concept (based on the 330) in the bin after they saw...

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by WIederling
Sat Sep 22, 2018 11:02 am
Forum: Non-Aviation
Topic: From Russia with true vol. 2
Replies: 500
Views: 11786

Re: From Russia with true vol. 2

Braybuddy wrote:
If you peel behind the veneer of posturing, blustering and blundering that Putin is doing on the world's stage, you'll find a deeply insecure man who is dragging his country down a rabbit hole, IMHO.


You mistyped "Trump".

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by WIederling
Sat Sep 22, 2018 8:41 am
Forum: Non-Aviation
Topic: Thr correct number of inches is . . .
Replies: 47
Views: 1121

Re: Thr correct number of inches is . . .

noviorbis77 wrote:
Dutchy wrote:
Inches? The world is measured in meters, and thus centimeters. Thus the question you proposed is a trick question.


Not everyone uses the metric system.


Wrong.
at least for length units.
the inch/foot/yard thingies .. today reference the meter for their definition.

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by WIederling
Sat Sep 22, 2018 8:30 am
Forum: Civil Aviation
Topic: Rolls identifies 787 Trent engine fix; cites air pollution cause
Replies: 24
Views: 5742

Re: Rolls identifies 787 Trent engine fix; cites air pollution cause

downdata wrote:
The air pollution must be pretty bad in New Zealand for them to park half their 789 fleet!!


The 787 is a regional commuter plane?

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by WIederling
Fri Sep 21, 2018 9:28 pm
Forum: Civil Aviation
Topic: Rolls identifies 787 Trent engine fix; cites air pollution cause
Replies: 24
Views: 5742

Re: Rolls identifies 787 Trent engine fix; cites air pollution cause

lightsaber wrote:
One guess why I am excited GE has put CMC turbine blades in the GE9X.


Any known Achilles heel to CMCs ?

sideline:
The Soviets were pretty competent in using enamel coatings in their oxygen rich rocket engines.
Any application here?

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by WIederling
Fri Sep 21, 2018 9:22 pm
Forum: Civil Aviation
Topic: Rolls identifies 787 Trent engine fix; cites air pollution cause
Replies: 24
Views: 5742

Re: Rolls identifies 787 Trent engine fix; cites air pollution cause

musman9853 wrote:
how does air pollution affect turbines?


eats protective coatings away.
( what happens if you pass SO2 through a hot turbine, what about ashes?
we do know that ashes and SO2 in higher concentrations definitely damage jet engines ... fast.)

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by WIederling
Fri Sep 21, 2018 11:43 am
Forum: Non-Aviation
Topic: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes
Replies: 48
Views: 1216

Re: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes

You are fine with a rule that prohibits a woman’s income from counting because she might get pregnant? trapped in PC thinking, I see. I find such a rule to be abhorrent. If that’s PC, consider me glad to be PC. Compare to everyone being able to sign a paper gets a 100% value payout mortgage on a pr...

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by WIederling
Fri Sep 21, 2018 10:18 am
Forum: Non-Aviation
Topic: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes
Replies: 48
Views: 1216

Re: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes

VTKillarney wrote:
You are fine with a rule that prohibits a woman’s income from counting because she might get pregnant?


trapped in PC thinking, I see.

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by WIederling
Fri Sep 21, 2018 9:32 am
Forum: Non-Aviation
Topic: Berlin wall vs Trump's wall
Replies: 33
Views: 997

Re: Berlin wall vs Trump's wall

Illegal immigration to the United States is not about separating families or wanting to live in a police state. It is about better wages here and less violence. Three mass shootings in two days and a rash of drive by shootings say otherwise, but that is for a different thread. This is the problem w...

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by WIederling
Fri Sep 21, 2018 9:18 am
Forum: Military Aviation & Space Flight
Topic: Russian Military Crashes
Replies: 164
Views: 48068

Re: Russian Military Crashes

Additionally, the GU-39 has much more range (good for stand-off attack) and you can carry more of them (fewer attacking aircrafts). bt In their illicit attacks the Israelis try to not enter Syrian territory with manned craft. "See, no trespass". you can't shoot us <thumbs nose>. and if yo...

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by WIederling
Fri Sep 21, 2018 9:09 am
Forum: Non-Aviation
Topic: Berlin wall vs Trump's wall
Replies: 33
Views: 997

Re: Berlin wall vs Trump's wall

People are willing to be in the United States illegally because of wealth distribution. They have none in their home country ..... Quite often due to the US liberating them and/or sponsoring military dictatorships and such in their home countries. On the other hand illegals are the perfect way to g...

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by WIederling
Fri Sep 21, 2018 8:35 am
Forum: Civil Aviation
Topic: Boeing 797 Discussion Thread - 2018
Replies: 3060
Views: 363600

Re: Boeing 797 Discussion Thread - 2018

Development timelines. for the 787 we need to add quite a bit of the effort spent on the Sonic Cruiser. ( warts like the battery system are afaics a carry over from that project ) for T-X I could imagine that it is mostly an "out of the drawer" design from Saab. With Boeing just wrapping i...

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by WIederling
Fri Sep 21, 2018 7:48 am
Forum: Technical/Operations
Topic: How the 737 MAX 10 landing gear works
Replies: 202
Views: 12706

Re: How the 737 MAX 10 landing gear works

With the MAX10 there seem to be two springs in series. One the normal dampened oleo and the other to extend the trailing link, possibly undampened and surely with a much different spring rate (because the trailing link can simply rest in the stops nearly all of the time (compressed while at the gro...

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by WIederling
Thu Sep 20, 2018 7:43 pm
Forum: Non-Aviation
Topic: Berlin wall vs Trump's wall
Replies: 33
Views: 997

Re: Berlin wall vs Trump's wall

Some people believe the greatest (only?) threat to the security of the United States is Mexicans. Just because a person comes across the Mexican border doesn't mean the person is a Mexican national. There was an article in the Detroit Free Press a couple months ago about a Romanian man in the count...

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by WIederling
Thu Sep 20, 2018 3:47 pm
Forum: Civil Aviation
Topic: Should AB launch A310-300 based on A330NEO
Replies: 45
Views: 6932

Re: Should AB launch A310-300 based on A330NEO

If Boeing can maintain systems commonality between a 788 and and a -10 why wouldn’t Airbus with a 330neo-derived A300/310neo? They can't. 788 has rather low commonality with the 789/10. 789 || 7810 is easy as the 7810 is a cheap capacity for range derivative. Obviously the core airframe and systems...

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by WIederling
Thu Sep 20, 2018 3:03 pm
Forum: Non-Aviation
Topic: Should dueling make a comeback?
Replies: 31
Views: 799

Re: Should dueling make a comeback?

casinterest wrote:
I suppose we should burn witches at the stake too?
What a medieval thread


today we #metoo them.
Witch hunts have long returned in different guises.

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by WIederling
Thu Sep 20, 2018 2:55 pm
Forum: Technical/Operations
Topic: How the 737 MAX 10 landing gear works
Replies: 202
Views: 12706

Re: How the 737 MAX 10 landing gear works

The more I think about this the nicer this solution feels, I desperately wanted to be a bodge but it just isn't. In fact the only mistake I think Boeing have made here is not having been forced down this route on the 900/900er years ago. This design is kind of a Rube Goldberg solution. It adds quit...

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by WIederling
Thu Sep 20, 2018 7:56 am
Forum: Non-Aviation
Topic: The Russian defense Ministry has convened a briefing on MH17. Right now.
Replies: 108
Views: 2680

Re: The Russian defense Ministry has convened a briefing on MH17. Right now.

Russia's credibility is close to zero, if not in the negative. "levels of credibility" These are invariably Ex Cathedra stipulations. Would you judge the other parties to the fray as strongly credible? Will people ever understand that Schopenhauer's "How to win an argument" was ...

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by WIederling
Thu Sep 20, 2018 7:24 am
Forum: Technical/Operations
Topic: How the 737 MAX 10 landing gear works
Replies: 202
Views: 12706

Re: How the 737 MAX 10 landing gear works

... if it is a passive system and relying on stored energy then a spring feels like a better option than compressed gas and if it is an active system then hydraulics seem like a better option. In my engineering experience gasses find every available leak location and this is going to be a very high...

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by WIederling
Tue Sep 18, 2018 5:26 pm
Forum: Non-Aviation
Topic: The Russian defense Ministry has convened a briefing on MH17. Right now.
Replies: 108
Views: 2680

Re: The Russian defense Ministry has convened a briefing on MH17. Right now.

Dutchy wrote:
Yes, and Ukraine must have missed those nukes when Russia took part of their territory.


is this sentence supposed to make any sense at all?

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by WIederling
Tue Sep 18, 2018 12:12 pm
Forum: Civil Aviation
Topic: Airbus Beluga XL Production Thread
Replies: 210
Views: 46745

Re: Airbus Beluga XL Production Thread

I didn't realize how stubby it was but it's probably just an optical illusion due to the fuselage height. 1m bigger fuselage and the tail has become "fatter". ( IMU the hold reaches further back into the tail and is thus fuller and vertical stab has been moved upwards.) Being overall long...

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by WIederling
Tue Sep 18, 2018 10:10 am
Forum: Non-Aviation
Topic: The Russian defense Ministry has convened a briefing on MH17. Right now.
Replies: 108
Views: 2680

Re: The Russian defense Ministry has convened a briefing on MH17. Right now.

scbriml wrote:
A reasonable person might ask, why has it taken Russia over four years to provide this "evidence"? :scratchchin:


4 month in my reckoning? Id details made public/handed to RF ...

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by WIederling
Tue Sep 18, 2018 7:40 am
Forum: Non-Aviation
Topic: The Russian defense Ministry has convened a briefing on MH17. Right now.
Replies: 108
Views: 2680

Re: The Russian defense Ministry has convened a briefing on MH17. Right now.

Ukraine is responsible? You mean mother russia didn't claim it's weapons after the USSR disolved ? Did they leave nukes with Ukraine as well? All weapons initially stayed with the (re)new(ed) nations being created after the dissolution of the soviet union where they had been deployed to. Afaik the ...

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by WIederling
Tue Sep 18, 2018 7:16 am
Forum: Technical/Operations
Topic: Engine over the fuselage question
Replies: 38
Views: 2363

Re: Engine over the fuselage question

https://www.google.com/search?q=dlr+attas

now decomissioned and followed up with the
A320 based ATRA platform:
https://www.dlr.de/dlr/en/desktopdefaul ... lery/19368
-->

DLR ATTAS:
see https://www.google.com/search?q=dlr+attas

now decomissioned and followed up with the
A320 based ATRA platform:
https://www.dlr.de/dlr/en/desktopdefaul ... lery/19368

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by WIederling
Mon Sep 17, 2018 3:36 pm
Forum: Non-Aviation
Topic: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes
Replies: 48
Views: 1216

Re: Between 2006 and 2014, nearly 10 million homeowners in America saw the foreclosure sale of their homes

https://www.reuters.com/article/germany-realestate-bundesbank/german-property-prices-up-to-35-pct-overvalued-bundesbank-idUSL8N1Q92AS FRANKFURT, Feb 19 (Reuters) - Real estate prices in German cities may be 15 to 30 percent overvalued, the Bundesbank said on Monday, warning that the deviation may b...

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by WIederling
Mon Sep 17, 2018 11:36 am
Forum: Technical/Operations
Topic: UA has retrofitted many of their 737s with scimitars- why haven't AA and DL done the same?
Replies: 14
Views: 1686

Re: UA has retrofitted many of their 737s with scimitars- why haven't AA and DL done the same?

Just like the Airbus fanboys claiming the A-320 family didn't need winglets because the wing was perfect. Then lo and behold, A-320 family gets winglets...... A bit of a misrepresentation. A320 did not get winglets beyond the endplates because other existing solutions at the time were not worthwhil...

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by WIederling
Mon Sep 17, 2018 11:30 am
Forum: Technical/Operations
Topic: How the 737 MAX 10 landing gear works
Replies: 202
Views: 12706

Re: How the 737 MAX 10 landing gear works

mxaxai wrote:
This point isn't all that relevant to this discussion here, but anyway, lift at 0° AoA is often not 0. Thus, the relationship between lift and AoA is not strictly proportional.


Just define AoA as deviation from the zero lift orientation and you are set. :-)

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