Search found 37 matches

by IgorD
Wed Jun 10, 2020 10:42 am
Forum: Non-Aviation
Topic: COVID-19 Non Aviation Thread - June 2020
Replies: 285
Views: 16828

Re: COVID-19 Non Aviation Thread - June 2020

It is a bit odd that there's 17k health care personnel tested positive with 47k people in the Netherlands in total tested positive. So about 35% of the Dutch cases are health care personnel! Still, I'm not sure what to read into this. We always know it was far more dangerous for the elderly, yet th...

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by IgorD
Tue Jun 09, 2020 1:45 pm
Forum: Non-Aviation
Topic: COVID-19 Non Aviation Thread - June 2020
Replies: 285
Views: 16828

Re: COVID-19 Non Aviation Thread - June 2020

Interesting Dutch numbers about COVID cases in health care personnel https://www.nd.nl/nieuws/varia/976482/bijna-17-000-zorgmedewerkers-hebben-corona-opgelopen Some 17k people got diagnosed with corona, of which some 3% developed heavy symptoms warranting hospitalization. From those 17k diagnosed, 1...

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by IgorD
Tue May 26, 2020 12:20 pm
Forum: Non-Aviation
Topic: COVID-19 Non Aviation Thread - May 2020
Replies: 435
Views: 24436

Re: COVID-19 Non Aviation Thread - May 2020

The excess deaths are not corrected for other reasons. The registered COVID death account for 50-60% of the excess death, so the rest was simply attributed to the disease. And sadly, we don't have a decline in traffic death due to corona -- these are also comparatively small compared to the corona d...

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by IgorD
Tue May 26, 2020 11:00 am
Forum: Non-Aviation
Topic: COVID-19 Non Aviation Thread - May 2020
Replies: 435
Views: 24436

Re: COVID-19 Non Aviation Thread - May 2020

I should add that the official count of positive tests in the Netherlands is (almost) meaningless information because when the outbreak was at its worst, testing was available only to those people who suffered so much as to be immediately admitted to the hospitals. The elderly were mostly not tasted...

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by IgorD
Tue May 26, 2020 10:50 am
Forum: Non-Aviation
Topic: COVID-19 Non Aviation Thread - May 2020
Replies: 435
Views: 24436

Re: COVID-19 Non Aviation Thread - May 2020

I can speak for the Netherlands, a country of some 17 million population. In mid April, a sampling of blood test gave a 3% population to be with antibodies, which is a sign that a person had corona infection https://www.volkskrant.nl/nieuws-achtergrond/nederlandse-groepsimmuniteit-nog-niet-in-zicht-...

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by IgorD
Tue Apr 21, 2020 12:26 pm
Forum: Non-Aviation
Topic: Coronavirus Non Aviation Thread - April 2020
Replies: 1896
Views: 67764

Re: Coronavirus Non Aviation Thread - April 2020

Harvey Weinstein, who has quite serious health issues, has managed to survive the virus, so I think Trump will manage too. I do believe that the Germans have the most accurate estimate of the infection mortality rate, 0.37% https://reason.com/2020/04/09/preliminary-german-study-shows-a-covid-19-infe...

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by IgorD
Mon Apr 20, 2020 10:36 pm
Forum: Non-Aviation
Topic: Coronavirus Non Aviation Thread - April 2020
Replies: 1896
Views: 67764

Re: Coronavirus Non Aviation Thread - April 2020

Wait a minute. I get jumped on for wanting to go to the gym but you all are supporting shooting anyone who leaves their home? Ok, now I know in the right. I wonder how you came to this conclusion. My point is that no plausible eradication attempt will be done, but prolonged quasi lockdown (at least...

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by IgorD
Mon Apr 20, 2020 10:19 pm
Forum: Non-Aviation
Topic: Coronavirus Non Aviation Thread - April 2020
Replies: 1896
Views: 67764

Re: Coronavirus Non Aviation Thread - April 2020

I think, @Waterbomber2, you are right on how to make a serious attempt at eradication of the virus. Most probably it is not going to happen, probably the societies will accept the costs in lives and open up. The tragedy (or irony) is that we are going to both, seriously damage the economy and write...

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by IgorD
Mon Apr 20, 2020 4:58 pm
Forum: Non-Aviation
Topic: Coronavirus Non Aviation Thread - April 2020
Replies: 1896
Views: 67764

Re: Coronavirus Non Aviation Thread - April 2020

I think, @Waterbomber2, you are right on how to make a serious attempt at eradication of the virus. Most probably it is not going to happen, probably the societies will accept the costs in lives and open up. The tragedy (or irony) is that we are going to both, seriously damage the economy and write ...

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by IgorD
Thu Apr 16, 2020 10:16 am
Forum: Non-Aviation
Topic: Coronavirus Non Aviation Thread - April 2020
Replies: 1896
Views: 67764

Re: Coronavirus Non Aviation Thread - April 2020

That is encouraging to hear. Very crudely, and very speculatively, if 5% of donors were infected in February and subsequently recovered, it might take a year or less to hit herd immunity levels. That would be a big help in contending with this virus if the population cannot be innoculated with an e...

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by IgorD
Thu Apr 16, 2020 8:48 am
Forum: Non-Aviation
Topic: Coronavirus Non Aviation Thread - April 2020
Replies: 1896
Views: 67764

Re: Coronavirus Non Aviation Thread - April 2020

The Dutch National Institute for Public Health and the Environment reports that 3% of blood samples in blood donor groups show antibodies for the coronavirus. This is a preliminary result. The IRVM also says that the level of antibodies varies and correlates with the severity of the symptoms of infe...

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by IgorD
Sat Mar 28, 2020 3:39 pm
Forum: Non-Aviation
Topic: Novel Coronavirus outbreak
Replies: 4092
Views: 165906

Re: Novel Coronavirus outbreak

Belgium has published ugly statistics for today. 64 new daily deaths 1850 new daily infections 585 newly hospitalised 353 total deaths 9134 total infections 3717 hospitalised of whom 789 in ICU, occupying 43% of total current dedicated bed capacity. This is a country 1/6th the population of Italy, ...

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by IgorD
Tue Mar 10, 2020 4:50 pm
Forum: Non-Aviation
Topic: Novel Coronavirus outbreak
Replies: 4092
Views: 165906

Re: Novel Coronavirus outbreak

4 percent of sampled employees with mild respiratory complaints of six North-Brabant hospitals in the Netherlands are infected with the corona virus, according to samples of employees of these hospitals. The tests were conducted on Saturday and Sunday at the request of the National Institute for Pub...

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by IgorD
Fri Feb 14, 2020 10:32 pm
Forum: Technical/Operations
Topic: How much fuel does an A321 Neo burn per hour?
Replies: 5
Views: 1649

Re: How much fuel does an A321 Neo burn per hour?

That seems a bit underestimated. At 89 t it should burn about 2680 kg per hour at an optimum altitude. I think the correction of 10kg per hour for each extra ton is valid for the same FL. However if you're heavy, you'll have to be lower, i.e. you add parasitic drag to the induced drag. FL370 is not ...

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by IgorD
Fri Feb 14, 2020 2:58 pm
Forum: Technical/Operations
Topic: Fuel Burn for A320
Replies: 21
Views: 2375

Re: Fuel Burn for A320

It depends on the weight and what part of the segment you are on... first hour? Third hour? Sharklets? New frame or old frame? Generally, later cruise mid thirty’s IAE per side fuel burn a320 sharklet is about 2500/Hr per engine. I was flying an a321 neo PW this week, the fuel fluctuates more then ...

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by IgorD
Sun Feb 09, 2020 9:51 pm
Forum: Technical/Operations
Topic: How much fuel does an A321 Neo burn per hour?
Replies: 5
Views: 1649

Re: How much fuel does an A321 Neo burn per hour?

hotelmode wrote:
Its a lot less than that. Around 2t/Hr, normally a bit less.

Could you tell for what weight this number is? I can imagine 2t/h for a 70 t gross weight and a lower M number.

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by IgorD
Sun Feb 09, 2020 9:36 pm
Forum: Technical/Operations
Topic: How much fuel does an A321 Neo burn per hour?
Replies: 5
Views: 1649

Re: How much fuel does an A321 Neo burn per hour?

Appoximately 1/33 of its weight per hour in ISA conditions, LRC at a (near) optimum altitude. For a weight of 80 ton it will burn aprox 2,45 ton per hour.

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by IgorD
Wed Feb 05, 2020 8:16 pm
Forum: Technical/Operations
Topic: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?
Replies: 20
Views: 1895

Re: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?

Interestingly, the cargo capacity is often stated in the number of LD3 positions available, while the majority of cargo travels on the pallets. LD3 is (fixed) volume a pallet is area.? A pallet has a certain carrying volume that is limited by the height and curvature of the belly. Pallets and cans ...

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by IgorD
Wed Feb 05, 2020 7:08 pm
Forum: Technical/Operations
Topic: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?
Replies: 20
Views: 1895

Re: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?

Looks good on 4color glossies. If you look at like that then basically every wide body now has “excessive” capacity. For example on the A35K you would have 39.6t of cargo, with 68t max payload (stolen from Wikipedia, not sure how accurate) that is only 28.4t for passengers, also low for a A350-1000...

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by IgorD
Wed Feb 05, 2020 2:56 pm
Forum: Technical/Operations
Topic: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?
Replies: 20
Views: 1895

Re: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?

I wonder what are the average freight loads on widebody aircraft. Indeed a plane can be loaded with cargo up to the MZFW, for a typical 77W the max freight is probably around 25 ton. I.e. 170 DOW + 40 ton pax and bags + 27 ton freight = 237 MZFW. This assumes the MTOW is not exceeded :) But what ar...

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by IgorD
Wed Feb 05, 2020 9:15 am
Forum: Technical/Operations
Topic: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?
Replies: 20
Views: 1895

Re: What are the differences in cargo capacity between the B77W, B77E, A350-900/1000 and 787-8/9?

I wonder what are the average freight loads on widebody aircraft. Indeed a plane can be loaded with cargo up to the MZFW, for a typical 77W the max freight is probably around 25 ton. I.e. 170 DOW + 40 ton pax and bags + 27 ton freight = 237 MZFW. This assumes the MTOW is not exceeded :) But what are...

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by IgorD
Wed Jan 15, 2020 12:00 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Cool that Hifly publish the data of their aircraft! I would take these data with a pinch of salt though. For instance they say for one of their machines that the DOW is 126 ton and MZF is 177, while max payload is 45 ton. 177-126 =51 -- that should be their payload, or another explanation is that th...

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by IgorD
Wed Jan 15, 2020 11:15 am
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Wiki shows a 137 ton OEW for A339. I know it is not very reliable (and I was myself surprised by this number), but I did not see other data for the empty weight. . oh, that is pretty reliable, as in having a proper source, i.e. a proposal to United from, iirc, before the Neo was even launched. So, ...

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by IgorD
Tue Jan 14, 2020 7:24 am
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Wiki shows a 137 ton OEW for A339. I know it is not very reliable (and I was myself surprised by this number), but I did not see other data for the empty weight.

In case of a 130 ton DOW, there would be some 8 ton left for the reserves, which would be enough in the majority of cases. Nice.

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by IgorD
Mon Jan 13, 2020 9:01 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Assuming DoW of 137 ton, 40 ton payload = ZFW of 177 ton. Adding 12 hours of 5,3 ton hourly average burn (63,6 ton) would give us 240,6 ton. Given 242 ton MTOW there is only 1,4 ton capacity available for the reserves. Which is less than 30 minutes of hold at 1500. The only way to make it right is i...

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by IgorD
Tue Oct 08, 2019 9:08 pm
Forum: Civil Aviation
Topic: October 7, 2019: KLM is 100 years old!
Replies: 44
Views: 7398

Re: October 7, 2019: KLM is 100 years old!

Van harte gefeliciteerd, KLM! Ik ben trots op jullie!

Here's to another 100 years!

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by IgorD
Wed Sep 11, 2019 1:09 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Hi Fred, thanks, very interesting! Your model predicts a 2% fuel burn diffence for equal weights and SFCs, which is in agreement with my model, where I have an error margine of a few percent. Once the models are calibrated & validated it is rather easy to answer essentially all questions on what...

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by IgorD
Tue Sep 10, 2019 3:54 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Thomas, I appreciate your critique! But let me explain some things where we differ. First, FCOM is an official document. It provides datapoints on fuel burn at certain weights and altitudes. When I put these datapoints into a regression, it looks like x = ab + c, where x is fuel burn, a is a coeffic...

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by IgorD
Tue Sep 10, 2019 2:32 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

And what makes you think it is 1/38th for both? Airbus did stick some 15 feet more wing onto for a reason, i would think they did so to burn less fuel. I would also assume that effective wingspan wise that should even be more of a difference. Plus of course, from the publicly available data OEW may...

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by IgorD
Tue Sep 10, 2019 1:13 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

My model estimates an average fuel burn for B781 of 5,9 ton/hour for a payload of 57 ton and a flight length of 9 hours (circa 4290 nm still air, ISA conditions, landing with 8,5 ton reserves). Takeoff at 254 and landing at about 201 ton. The 781 will burn 5,1 ton per hour on a 9 hour flight with fu...

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by IgorD
Tue Sep 10, 2019 1:03 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Zeke, my point is that both types (B787 and A359) burn around 1/38 of their gross weight per hour in flight at LRC speed, optimum altitude and ISA temps. Speed or temperature deviation or change would affect both types equally. Assuming same DOWs of 781 and 359 (which is reasonable giving your datap...

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by IgorD
Sun Sep 08, 2019 8:28 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 483
Views: 116937

Re: 787 vs A350 range

Where was that datum sourced? It was posted on this site (possibly even up-thread). The flight in question occurred on 14 February 2019. The specifics posted: TOW: 237,520kg Payload: 26,000kg (226 passengers + 3800kg cargo + 3900kg bags) ZFW: 161,090kg Flight Time: 13:41h Trip Fuel: 71,440kg (1678k...

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by IgorD
Wed Aug 07, 2019 11:31 pm
Forum: Civil Aviation
Topic: Confirmed: KLM Orders/Leasing 2 x 777-300s and Converts 789s to 10s
Replies: 127
Views: 24681

Re: KLM Orders/Leasing 2 x 777-300s (unconfirmed) and Converts 789s to 10s (confirmed)

Noise is hard to generalize, it depends indeed on where you seat and your own perception. In my experience, it also depends pretty much on the speed: a 77W flying at M.813 is very quiet, much quieter than anything else flying M.85 or faster. As you do not always have the speed data, comparing noise ...

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by IgorD
Thu Jul 11, 2019 8:51 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 823
Views: 123226

Re: LOT News Thread - 2019

https://www.afklcargo.com/NL/en/common/ ... /fleet.jsp

Could be that they counted both the bags and freight. But still, if they get 20 ton on average it is a very good load.
-->

That's a lot! AF-KL show cargo capacity of their 789 to be 20 ton https://www.afklcargo.com/NL/en/common/ ... /fleet.jsp

Could be that they counted both the bags and freight. But still, if they get 20 ton on average it is a very good load.

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by IgorD
Thu Jul 11, 2019 7:57 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 823
Views: 123226

Re: LOT News Thread - 2019

Guys, do you have any data on LOT's load factors, across their overall network and the European one? It seems they don't publish any usefull traffic statistics. According to one article I found the overall load factor was 78% in 2017 with the most profitable routes being Tokyo 80% and Seoul 85%. An...

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by IgorD
Wed Jul 10, 2019 8:59 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 823
Views: 123226

Re: LOT News Thread - 2019

Guys, do you have any data on LOT's load factors, across their overall network and the European one? It seems they don't publish any usefull traffic statistics. Firstly, welcome to the forum (or rather first post). Unfortunately as a government owned airline LOT picks and chooses what data it publi...

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by IgorD
Wed Jul 10, 2019 7:34 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 823
Views: 123226

Re: LOT News Thread - 2019

Guys, do you have any data on LOT's load factors, across their overall network and the European one? It seems they don't publish any usefull traffic statistics.

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