Search found 3388 matches

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by kalvado
Tue Nov 30, 2021 7:42 pm
Forum: Technical/Operations
Topic: Turbofan Engine Shutdown Question
Replies: 7
Views: 785

Re: Turbofan Engine Shutdown Question

Are we talking about spinning unfeathered prop, or immobile? As far as I understand, most designs have no clutch between engine and prop (is ATR-42 hotel mode unique?) - is that the cause of the difference, that unfeathered prop has to work a piston engine? Here is the difference between a free tur...

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by kalvado
Tue Nov 30, 2021 7:35 pm
Forum: Civil Aviation
Topic: Aircraft that never was ... The Lockheed Flatbed
Replies: 22
Views: 4900

Re: Aircraft that never was ... The Lockheed Flatbed

I have no earthly idea how you’d be able to calculate your performance not knowing how much parasitic drag is being created by the shape of the payload. Fuel burn en route would be a total mystery until you’d flown for an hour. I love this kind of thing because it’s a glimpse of the strength of rec...

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by kalvado
Tue Nov 30, 2021 6:59 pm
Forum: Technical/Operations
Topic: Turbofan Engine Shutdown Question
Replies: 7
Views: 785

Re: Turbofan Engine Shutdown Question

There is no mechanism to stop the low-pressure spool from spinning. As FlapOperator says, unless it is seized somehow due to damage, it will spin. There is indeed drag, but nowhere near that of an unfeathered propeller. Are we talking about spinning unfeathered prop, or immobile? As far as I unders...

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by kalvado
Tue Nov 30, 2021 12:44 pm
Forum: Technical/Operations
Topic: Japanese overwing markings
Replies: 5
Views: 562

Re: Japanese overwing markings

Red circle seems to be located near the registration. At least some US aircraft have us flag painted next to the registration; and given how Japanese flag looks like that may be an answer The Japanese carriers paint the hinomaru on the left wing top, and the registration number on the right wing to...

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by kalvado
Tue Nov 30, 2021 1:48 am
Forum: Technical/Operations
Topic: Japanese overwing markings
Replies: 5
Views: 562

Re: Japanese overwing markings

Red circle seems to be located near the registration. At least some US aircraft have us flag painted next to the registration; and given how Japanese flag looks like that may be an answer

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by kalvado
Mon Nov 29, 2021 7:00 pm
Forum: Civil Aviation
Topic: Aircraft that never was ... The Lockheed Flatbed
Replies: 22
Views: 4900

Re: Aircraft that never was ... The Lockheed Flatbed

I think the idea would have been better as a slow speed turboprop with height restrictions. Yes, aerodynamically poor with a high fuel consumption; but very fast to load and unload. Extend a cabin shield back to encompass the 1st few feet of cargo would reduce aerodynamic drag a fair amount. The mi...

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by kalvado
Mon Nov 29, 2021 6:58 pm
Forum: Civil Aviation
Topic: Aircraft that never was ... The Lockheed Flatbed
Replies: 22
Views: 4900

Re: Aircraft that never was ... The Lockheed Flatbed

If you think about it, idea was realized to some extent. Shuttle-carrying 747 is one instance. VM-T used in russian shuttle program is another one. https://en.wikipedia.org/wiki/Myasishchev_VM-T Although both instances limited to specific and somewhat aerodynamic cargo. https://64.media.tumblr.com/a...

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by kalvado
Fri Nov 26, 2021 3:28 pm
Forum: Civil Aviation
Topic: All-electric aircraft from Rolls-Royce completes maiden flight in Britain
Replies: 36
Views: 5940

Re: All-electric aircraft from Rolls-Royce completes maiden flight in Britain

Everytime electric airplanes come up on this site there is a flood of negative comments directed at something no one is suggesting. No one is expecting or predicting an electric 737 replacement anytime soon, but electric powered GA planes and commercial service on short routes served by small prop ...

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by kalvado
Fri Nov 26, 2021 1:54 pm
Forum: Civil Aviation
Topic: All-electric aircraft from Rolls-Royce completes maiden flight in Britain
Replies: 36
Views: 5940

Re: All-electric aircraft from Rolls-Royce completes maiden flight in Britain

Everytime electric airplanes come up on this site there is a flood of negative comments directed at something no one is suggesting. No one is expecting or predicting an electric 737 replacement anytime soon, but electric powered GA planes and commercial service on short routes served by small prop ...

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by kalvado
Fri Nov 26, 2021 12:20 pm
Forum: Civil Aviation
Topic: All-electric aircraft from Rolls-Royce completes maiden flight in Britain
Replies: 36
Views: 5940

Re: All-electric aircraft from Rolls-Royce completes maiden flight in Britain

... given the slow progress of current battery efficiency. Only with some breakthrough technology this might change one day. If anything the development is definitely not slow. Battery density has tripled in the last decade and only more money is flowing to research and production. Just follow the ...

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by kalvado
Tue Nov 23, 2021 2:49 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

Did I? I see that Kanban wrote that in response to a message by you. Originally you attributed the quote to me. Looks like it was fixed fairly fast Or maybe everyone can mess up- even those who criticize Boeing Sorry I have not touched my original post. I did removed the quote from you to just pick...

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by kalvado
Tue Nov 23, 2021 11:31 am
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

StTim wrote:
Did I? I see that Kanban wrote that in response to a message by you.

Originally you attributed the quote to me. Looks like it was fixed fairly fast
Or maybe everyone can mess up- even those who criticize Boeing

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by kalvado
Tue Nov 23, 2021 10:41 am
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

I do think Boeing was a bit more adventurous than Airbus with their half assed frame and panel approach, but then again it fits their scattered around town manufacturing processes. . I do think your use of language here betrays your inherent bias. I think quoting a wrong person sends a mixed message

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by kalvado
Tue Nov 23, 2021 1:28 am
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

Making it short - do you think Boeing went over their paygrade when trying to design 787, or you have some other message here? no I don't... yes there are challenges in any radically new design or manufacturing process. and yes there are always a few dim wits..like the manufacturing engineers who f...

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by kalvado
Mon Nov 22, 2021 9:27 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

many of the things the FAA is squawking about are too small to be seen or buried that only a destructive test can find. The long term impact is unknown however with 1000 flying with many cycles on them, there seems to be no issue. What kind of point are you even attempting to make with that? Do you...

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by kalvado
Mon Nov 22, 2021 8:35 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

No. They should have discovered any process change that risks the qualification of the product through continuous on-site Supplier Quality Assurance Processes. You're not trying to tell me that Boeing don't have an on-site SQA team at MHI for such a fundamental part of the product? I was pretty sur...

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by kalvado
Mon Nov 22, 2021 5:52 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

Looks more like a Boeing bashing thread than the actual topic which was QUALITY. They make quality planes and hope they will come out of it. So far, a better statement would be "They had been making quality planes, and hopefully they will be making them again someday" Let's hope things wi...

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by kalvado
Mon Nov 22, 2021 5:47 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

Edited for shortness: See above for full statements I've actually lived the kind of change that the Engineers at Boeing have to be going through.... Edited for shortness: See above So I've lived this... and seen how hard it is for an organization to really change. And yes, having people constantly ...

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by kalvado
Mon Nov 22, 2021 4:32 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

I wonder how many critics have actually worked in aircraft manufacturing or inspection. many of the things the FAA is squawking about are too small to be seen or buried that only a destructive test can find. The long term impact is unknown however with 1000 flying with many cycles on them, there se...

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by kalvado
Mon Nov 22, 2021 3:45 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

A thought on this, and on how we discuss things. Let's say that Boeing gets its house in order. As part of that, they would no doubt turn up issues from when their house was disordered. I fear when they do this, they would then be castigated for "yet more Boeing problems", when in fact we...

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by kalvado
Mon Nov 22, 2021 11:07 am
Forum: Technical/Operations
Topic: Concorde droop nose design question
Replies: 14
Views: 2223

Re: Concorde droop nose design question

Ah. What an amazing technical design. I was not expecting an articulated visor configuration. Never had the chance to see a Concorde up close in action. Thanks! I wonder if any modern civilian SST designs will adopt this system. With today's camera and screen technology, I think it would be far eas...

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by kalvado
Sun Nov 21, 2021 6:33 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

Zeke: from what I hear from old acquaintances inside, there are assembly drawings and manufacturing plans that did not include fit and fair, shim as required notes.. without those the FAA would insist on zero tolerances even when logic says different. The problem is worsened by the FAA being embarr...

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by kalvado
Sun Nov 21, 2021 6:03 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: Boeing 787 Production/Delivery Thread - 2021

Then I understand we agree that avoiding contamination is NOT an idealistic requirement but rather a basic one. Of course, if hundreds of 787 wings have been produced without respecting this basic requirement, it's obvious that engineering will have to try to save the day. Cleaning is a basic requi...

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by kalvado
Sun Nov 21, 2021 5:03 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: Boeing 787 Production/Delivery Thread - 2021

Accommodating the practical logistical issues is one thing. Having the part material contaminated during its manufacturing is different. It is a basic requirement to avoid the contamination of CFRP parts during their manufacturing. It is equally basic requirement to ensure clean surface before appl...

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by kalvado
Sun Nov 21, 2021 1:52 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: Boeing 787 Production/Delivery Thread - 2021

Avoiding the sort of CFRP contamination reported here wouldn't probably fall in the "overly idealistic" requirement category though. It definitely falls into that category. There are pretty specific, sometimes unexpected types of process control issues which must be prevented. Surface con...

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by kalvado
Sun Nov 21, 2021 12:46 pm
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: Boeing 787 Production/Delivery Thread - 2021

This what happens when a regulatory agency squats in the middle of a production process. In the past when these things were discovered, if the process spec, drawing or procedure were overly idealistic, engineering would initiate drawing, spec changes where necessary to match process output with des...

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by kalvado
Sun Nov 21, 2021 1:23 am
Forum: Civil Aviation
Topic: Security Incident at ATL
Replies: 37
Views: 8085

Re: Security Incident at ATL

https://www.forbes.com/sites/kimberleespeakman/2021/11/20/passenger-accidentally-fired-weapon-at-atlanta-airport-causing-panic-flight-delays/?sh=61be7057f975 Apparently a passenger had a weapon in a carry on bag (which, they should not - the rules are guns have to be checked in a hard sided case) a...

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by kalvado
Sun Nov 21, 2021 12:50 am
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

https://www.seattletimes.com/business/boeing-aerospace/faa-memo-reveals-more-boeing-787-manufacturing-defects-including-contamination-of-carbon-fiber-composites/ huh, no wonder they can't even get their E-jet competitor certified More like Alcoa fiasco repeated. Someone at Boeing didn't read the sp...

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by kalvado
Sun Nov 21, 2021 12:33 am
Forum: Civil Aviation
Topic: FAA Confirms Boeing Halts 787 Deliveries
Replies: 392
Views: 91293

Re: FAA Confirms Boeing Halts 787 Deliveries

https://www.seattletimes.com/business/boeing-aerospace/faa-memo-reveals-more-boeing-787-manufacturing-defects-including-contamination-of-carbon-fiber-composites/ The internal FAA memo relates how, early this year, Boeing reported to the FAA that Mitsubishi Heavy Industries in Japan — which builds t...

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by kalvado
Wed Nov 17, 2021 8:04 pm
Forum: Civil Aviation
Topic: Updated: Boeing's Fatal Flaw, former Chief Technical Pilot indicted
Replies: 382
Views: 49014

Re: Updated: Boeing's Fatal Flaw, former Chief Technical Pilot indicted

The Lion Air Official Aircraft Accident report has been released and is available on the Indonesian Aircraft Accident Investigiation site. The Ethiopean Accident report has not been released and is a preliminary version only. When the official report will be released is not currently known given th...

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by kalvado
Sat Nov 13, 2021 4:43 pm
Forum: Technical/Operations
Topic: Why is Jet fuel not more popular on SE aicrafts?
Replies: 28
Views: 2270

Re: Why is Jet fuel not more popular on SE aicrafts?

Saturn 5 F1 engines burned RP-1 which is pretty much kerosene. They used it as it was simple and known fuel. RP-1 compares to Jet-a pretty much same way as distilled apyrogenic water for IV injections compares to rainwater in backyard barrel. Both are water... Yeah, it more refined, less sulfur and...

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by kalvado
Sat Nov 13, 2021 1:53 pm
Forum: Technical/Operations
Topic: Why is Jet fuel not more popular on SE aicrafts?
Replies: 28
Views: 2270

Re: Why is Jet fuel not more popular on SE aicrafts?

GalaxyFlyer wrote:
Saturn 5 F1 engines burned RP-1 which is pretty much kerosene. They used it as it was simple and known fuel.

RP-1 compares to Jet-a pretty much same way as distilled apyrogenic water for IV injections compares to rainwater in backyard barrel. Both are water...

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by kalvado
Sat Nov 13, 2021 9:41 am
Forum: Technical/Operations
Topic: Why is Jet fuel not more popular on SE aicrafts?
Replies: 28
Views: 2270

Re: Why is Jet fuel not more popular on SE aicrafts?

Correct me if I am wrong, but I had an impression that jet-a has pretty lousy specs compared to any piston fuel. There were some interesting mentions that jet-a is not used in any rocket engines for missiles, despite military being highly interested in using existing fuel supplies for rockets. Whene...

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by kalvado
Fri Nov 12, 2021 9:20 pm
Forum: Non-Aviation
Topic: Possible EU ban of Turkish Airlines, flydubai
Replies: 80
Views: 5343

Re: Possible EU ban of Turkish Airlines, flydubai

Globalization was the policy west pushed for. With more travel all over the world, more information flowing via internet, more long haul economic ties, and more warfare being deployed across thousands miles it is impossible to keep certain people at bay just because they happened to be born with th...

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by kalvado
Fri Nov 12, 2021 4:24 pm
Forum: Civil Aviation
Topic: Updated: Boeing's Fatal Flaw, former Chief Technical Pilot indicted
Replies: 382
Views: 49014

Re: Updated: Boeing's Fatal Flaw, former Chief Technical Pilot indicted

others in Boeing disclosed MCAS’s expanded operational scope to different FAA personnel who were responsible for determining whether the 737 MAX met U.S. federal airworthiness standards That's part of a bigger problem. Such information should not be spread as word of mouth. And it is ESPECIALLY bad...

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by kalvado
Fri Nov 12, 2021 3:07 pm
Forum: Civil Aviation
Topic: Updated: Boeing's Fatal Flaw, former Chief Technical Pilot indicted
Replies: 382
Views: 49014

Re: Updated: Boeing's Fatal Flaw, former Chief Technical Pilot indicted

Boeing needs their investors to agree on investing first. If they only would move ahead now they could beat their competitors. They almost waited for too long. Now they face low deliveries/income and must invest big at the same time. Bring the NMA, bring the NSA but plan with realistic schedules an...

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by kalvado
Fri Nov 12, 2021 2:53 pm
Forum: Non-Aviation
Topic: Possible EU ban of Turkish Airlines, flydubai
Replies: 80
Views: 5343

Re: Possible EU ban of Turkish Airlines, flydubai

Sorry, that is a nonsense argument. Globalisation has created wealth across the globe, opening new markets and bringing more income to countries and its citizens than they had before, for the benefit of everyone. Even people in developed countries might look in envy at the standard of living in som...

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by kalvado
Thu Nov 11, 2021 6:45 pm
Forum: Non-Aviation
Topic: Possible EU ban of Turkish Airlines, flydubai
Replies: 80
Views: 5343

Re: Possible EU ban of Turkish Airlines, flydubai

The globalisation of illegal immigrants and refugees was not what the west asked for. WW2 happened, it resulted in the largest number of displaced people in human history, by 1950 the vast majority of those people had returned home and started rebuilding, back then there were very few options avail...

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by kalvado
Thu Nov 11, 2021 3:20 pm
Forum: Non-Aviation
Topic: Possible EU ban of Turkish Airlines, flydubai
Replies: 80
Views: 5343

Re: Possible EU ban of Turkish Airlines, flydubai

The globalisation of illegal immigrants and refugees was not what the west asked for. WW2 happened, it resulted in the largest number of displaced people in human history, by 1950 the vast majority of those people had returned home and started rebuilding, back then there were very few options avail...

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by kalvado
Thu Nov 11, 2021 2:27 pm
Forum: Non-Aviation
Topic: Possible EU ban of Turkish Airlines, flydubai
Replies: 80
Views: 5343

Re: Possible EU ban of Turkish Airlines, flydubai

Turkey also needs to get tough and close it's borders to refugees. The entire process is screwed, it was never intended to handle anywhere near the numbers that are either real or pretend refugees. It needs to stop. Globalization was the policy west pushed for. With more travel all over the world, ...

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by kalvado
Thu Nov 11, 2021 2:09 pm
Forum: Non-Aviation
Topic: Possible EU ban of Turkish Airlines, flydubai
Replies: 80
Views: 5343

Re: Possible EU ban of Turkish Airlines, flydubai

What European non-sense. FZ and TK sell seats legally to passengers entitled to enter Belarus. What happens to them once in Belarus is hardly a problem for the airlines. Now if the EU is truly interested in helping refugees why don't they fulfil their promises and fully deliver billions in aid and ...

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by kalvado
Thu Nov 11, 2021 1:57 pm
Forum: Non-Aviation
Topic: Possible EU ban of Turkish Airlines, flydubai
Replies: 80
Views: 5343

Re: Possible EU ban of Turkish Airlines, flydubai

It is an absolute disgrace that Belarus's President Alexander Lukashenko, is using refugees as a weapon against the EU, with the blessing of the Kremlin of course. Erdogan did the same. Welcome to the real world of hybrid warfare, where anything anything may be weaponized if the other side is fooli...

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by kalvado
Tue Nov 09, 2021 5:00 pm
Forum: Aviation Hobby
Topic: China cracking down on Flightradar24/ADS-B monitoring
Replies: 14
Views: 2366

Re: China cracking down on Flightradar24/ADS-B monitoring

Seems China does not like folks picking up those pesky ADS-B signals being used to show us where planes are. Banned the site and confiscated equipment from at least one person. Wouldn't anything they really want to hide not be sending ADS-B signals anyway? https://theprint.in/opinion/chinascope/chi...

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by kalvado
Mon Nov 08, 2021 6:54 pm
Forum: Civil Aviation
Topic: Startup plans to electrify BAe146 plane
Replies: 27
Views: 5457

Re: Startup plans to electrify BAe146 plane

What is 30 mins of power worth in fuel? A couple hundred or maybe a thousand pounds. Lighter and cheaper to just use 2 jet engines if that's all the runtime you want out of your batteries and electric motors. A 4 engine airplane that only uses 2 at time would be incredibly complex and incredibly in...

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by kalvado
Mon Nov 08, 2021 12:15 pm
Forum: Civil Aviation
Topic: AAnother Meltdown
Replies: 289
Views: 44141

Re: AAnother Meltdown

FSDan wrote:
seatback wrote:
With UA's recent cut backs in regional markets, are we going to see AA do something similar, or will we see them take advantage of the situation (i.e. add: ORD-ILM)?


They already fly ORD-ILM...

Maybe it was "fly it without cancelations"?

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by kalvado
Fri Nov 05, 2021 3:31 pm
Forum: Civil Aviation
Topic: AAnother Meltdown
Replies: 289
Views: 44141

Re: AAnother Meltdown

The meltdown also shows the risk of a mega hub on total operations. If major hurricane storms went through Atlanta, Delta’s operations would have (and did in the past) experience similar stresses. I’m not defending AA management. They have done a credible job of keeping the domestic system function...

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by kalvado
Thu Nov 04, 2021 2:21 pm
Forum: Civil Aviation
Topic: FT: Risks of Airbus passing 60% market share.
Replies: 92
Views: 15817

Re: FT: Risks of Airbus passing 60% market share.

And the fact that Boeing has 90 % of the cargo market is fine and Airbus should not even try to get more of that market ? Both are problems IMHO. One hurts certain people, other doesn't On the other hand, there is economy of scale issue for a very complex systems. Consider, say, spoons or scissors....

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by kalvado
Wed Nov 03, 2021 9:01 pm
Forum: Civil Aviation
Topic: FT: Risks of Airbus passing 60% market share.
Replies: 92
Views: 15817

Re: FT: Risks of Airbus passing 60% market share.

Wait, wait, I still remember when Boeing used to be the dominant manufacturer across the world. Especially before A320 enter the market. The market would correct itself because of the diverse global need. It's not a monopoly. Question is where the market would settle after correcting itself, and wh...

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by kalvado
Wed Nov 03, 2021 8:50 pm
Forum: Civil Aviation
Topic: FT: Risks of Airbus passing 60% market share.
Replies: 92
Views: 15817

Re: FT: Risks of Airbus passing 60% market share.

We are drifting off topic but the tanker quality issues and the space capsule problems point to a pretty widespread malaise at the company. Boeing will survive but it is going to take time and how it is after recovery remains to be seen. That's why it may make sense for the airlines to consider mor...

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by kalvado
Wed Nov 03, 2021 5:37 pm
Forum: Civil Aviation
Topic: FT: Risks of Airbus passing 60% market share.
Replies: 92
Views: 15817

Re: FT: Risks of Airbus passing 60% market share.

To paraphrase someone famous, the pending demise of Boeing is being greatly exaggerated. Rough times, no doubt about it. They really screwed themselves with the whole Max fiasco. That appears to be nearing it's end. The ongoing problems with the 787 line and the delays on the 777X program will also...

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