Search found 7133 matches

by prebennorholm
Tue Apr 13, 2021 12:48 am
Forum: Military Aviation & Space Flight
Topic: Can we remake plastic waste into rocket fuel?
Replies: 9
Views: 500

Re: Can we remake plastic waste into rocket fuel?

Have you heard about the new special type of rocket fuel that is made from plastic waste? No, haven't heard that. Would be useful if you provide type(s) of rocket fuel involved. There are a few of them, for instance: Liquid hydrogen Kerosene Hydrazine Unsymmetrical dimethylhydrazine Dinitrogen tetr...

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by prebennorholm
Tue Apr 06, 2021 12:00 am
Forum: Non-Aviation
Topic: Norway sees new homicide record 1st quarter 2021. Zero.
Replies: 21
Views: 1335

Re: Norway sees new homicide record 1st quarter 2021. Zero.

M564038 wrote:
Zero homocides first quarter 2021,

So obviously Breivik hasn't been released from prison yet.

But beware when that happens (cannot last all that long). He has changed his name to Hansen (full name Fjotolf Hansen).

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by prebennorholm
Sat Mar 20, 2021 1:50 am
Forum: Civil Aviation
Topic: KEF Airport preparing for a Volcanic Eruption
Replies: 27
Views: 6761

Re: KEF Airport preparing for a Volcanic Eruption

According to Deutsche Welle flights from and to KEF have been halted: https://m.dw.com/en/iceland-halts-air-travel-following-volcanic-eruption/a-56935890 Currently I see one Wizzair flight inbound landing in 15min, though. VAAC London also published advisory aviation color code red: https://www.met...

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by prebennorholm
Sat Mar 20, 2021 12:15 am
Forum: Civil Aviation
Topic: KEF Airport preparing for a Volcanic Eruption
Replies: 27
Views: 6761

Re: KEF Airport preparing for a Volcanic Eruption

Lava flow is heading south. It means that the main road to KEF will not be affected.

Nothing indicates that this eruption will be explosive, and therefore it is unlikely to disturb air traffic with atmospheric dust like the Eyjafjallajökull eruption in 2010.

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by prebennorholm
Mon Mar 15, 2021 12:03 am
Forum: Civil Aviation
Topic: 737, shrinked 707?
Replies: 32
Views: 7089

Re: 737, shrinked 707?

One important difference between 737 and 707 (and 727) is that the 737 from day one was designed for two flight crew members instead of three. It has been said that it was done by moving the 707 (727) flight engineer's wall panel to the roof between the two 737 pilots. It is not the whole truth, rea...

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by prebennorholm
Sun Mar 14, 2021 3:24 am
Forum: Civil Aviation
Topic: Nordic Aviation 2021
Replies: 249
Views: 39782

Re: Nordic Aviation 2021

Well, considering that an effusive volcanic eruption on the Reykjanes peninsula is currently highly likely in the near future, let's see if those lava flows will eventually reach the coast cutting off the highways... And if we'll have KEF-RKV flights after that :stirthepot: Nah, if it should come t...

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by prebennorholm
Mon Mar 08, 2021 1:53 am
Forum: Civil Aviation
Topic: Batik Air A320 lands with nosegear turned 90 degrees
Replies: 52
Views: 9355

Re: Batik Air A320 lands with nosegear turned 90 degrees

bennett123 wrote:
If it can default to 90 degrees, why not default to 0 degrees?.

Landing in sidewind and the nosegear stuck at 0 degrees would often result in high speed runway departure.

To default at 90 degrees when nosegear steering fails is the safest option.

(Problem is that nosegear steering shall not fail)

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by prebennorholm
Sat Feb 27, 2021 12:16 am
Forum: Civil Aviation
Topic: Last 737 Classic Built 21 years ago.
Replies: 39
Views: 5314

Re: Last 737 Classic Built 21 years ago.

Two things kept it from being as big of a deal - we didn't have the internet or the 24/7 media so the general public wasn't as aware and the fleet wasn't grounded because of economics (pretty much every US carrier would have had to stop flying a majority of their routes). Yeah, and there was a thir...

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by prebennorholm
Sat Feb 20, 2021 3:31 am
Forum: Technical/Operations
Topic: Do ground vehicles in airports run on jet fuel or regular diesel?
Replies: 31
Views: 3765

Re: Do ground vehicles in airports run on jet fuel or regular diesel?

Diesel road vehicles will run perfectly well on Jet A, but long term problems will arise: 1. Jet A is an inferior lubricator compared to diesel fuel. Injection pump will wear faster. Factory warranty may be void. 2. During the later years formulation of diesel fuel has been changed in practically al...

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by prebennorholm
Wed Feb 10, 2021 2:32 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 128968

Re: Kobe Bryant killed in a helicopter crash

A board member at the NTSB hearing today stated that Zobayan had cancelled on many occasions the flights when the weather was bad. This would seem to me that he was a not a "must go" pilot. With 8,500 hr he has of course cancelled hundreds of flights over the years. Otherwise he would hav...

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by prebennorholm
Wed Feb 10, 2021 12:57 am
Forum: Civil Aviation
Topic: KLM - Global First - Commercial flight on 'Synthetic' Fuel
Replies: 21
Views: 2593

Re: KLM - Global First - Commercial flight on 'Synthetic' Fuel

Burning 500kg on a revenue flight, and not on a test in an engine test laboratory, that is 100% PR greenwashing and nothing else. The UFPs are a big problem, that needs to be adressed much more urgently. It may turn out, that many major airports must be moved away from major metropolitan areas becau...

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by prebennorholm
Tue Feb 09, 2021 3:09 am
Forum: Non-Aviation
Topic: Should politicians keep their promises?
Replies: 16
Views: 1050

Re: Should politicians keep their promises?

Tugger wrote:
Simple question: Are politicians required to "keep promises" they made during campaigning?

For Gods sake, no. NO !!!
If politicians keep their promises, then we will all have to pay at least 200% income tax.

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by prebennorholm
Tue Feb 09, 2021 1:11 am
Forum: Technical/Operations
Topic: Will future battery tech enable regenerative braking?
Replies: 14
Views: 2544

Re: Will future battery tech enable regenerative braking?

If you land and 60t aircraft at 100 knots, that is some 78 MJ in kinetic energy ~22Kwh. I am not sure how long breaking usually takes, but lets say 15 seconds.Your generators would hence need to be 240 x 22 Kwh ~5MW at 10KW/Kg generator weight that is half a ton of generator for the equivalent of 4...

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by prebennorholm
Wed Feb 03, 2021 8:54 am
Forum: Non-Aviation
Topic: Brexit part XI: 2021
Replies: 648
Views: 34230

Re: Brexit part XI: 2021

Good luck also for any side that wants to try to attempt a hard border between ROI-NI because then that brings the IRA into the picture. OMG. If that is really true, then why are we involved with these people? ROI has the right to be an EU member, but if..... The EU managed to make peace and the GF...

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by prebennorholm
Wed Jan 27, 2021 2:42 am
Forum: Civil Aviation
Topic: A322 may have new engine, wings and 12 extra seats
Replies: 146
Views: 24017

Re: A322 may have new engine, wings and 12 extra seats

Here are many different thoughts about what an A322 could look like. My guesses may be a little different. But would build on the successes of A321LR/-XLR: Longer CFRP wing with much larger fuel tanks, and improved cruise lift/drag ratio. Freeing up belly space due to no more center tanks. Effective...

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by prebennorholm
Sun Jan 24, 2021 6:21 am
Forum: Civil Aviation
Topic: SAS A333 double daily BRU-BHX
Replies: 43
Views: 9394

Re: SAS A333 double daily BRU-BHX

Given the city pair BRU - BHX, what's the most likely manufacturer to ask for these flights? Toyota? Jaguar? My guess would be Jaguar Land Rover. It is nowadays one company, a subsidiary of Tata Motors in Mumbai, India. The Jaguar branded cars have final assembly in Birmingham, BTW in old faclities...

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by prebennorholm
Tue Jan 19, 2021 4:57 am
Forum: Military Aviation & Space Flight
Topic: Did you know about this "eco" rocket?
Replies: 8
Views: 1730

Re: Did you know about this "eco" rocket?

As the oxidizer in the rocket — because fuel must always have an oxidizer — they have chosen to use hydrogen peroxide. This is the same oxidizer used in the Werner von Braun designed German V2 rocket during WWII. The advantage in using hydrogen peroxide is that it is a stable liquid in a wide range...

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by prebennorholm
Sun Jan 17, 2021 4:39 am
Forum: Travel, Polls & Preferences
Topic: North Pole / South Pole / Antarctica Routes?
Replies: 17
Views: 2641

Re: North Pole / South Pole / Antarctica Routes?

c) Were any airlines operating any routes that had them regularly (or always) flying over the north pole? The North Polar Sea including the point 90 deg. N has never been part of the most busy air routes. And the view is rather boring. On the contrary Greenland is crossed by airial highways with hu...

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by prebennorholm
Wed Jan 13, 2021 2:33 am
Forum: Civil Aviation
Topic: Norwegian News and Discussion Thread - 2021
Replies: 74
Views: 13529

Re: Norwegian News and Discussion Thread - 2021

According to the new share overview, 64% of the Norwegian shares are now held by Scandinavian investors (majority Norwegian, but a significant amount of Swedes as well), and 80% of the shares are owned by European investors There was an extraordinary shareholder meeting on 17 December. On the agend...

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by prebennorholm
Tue Jan 12, 2021 2:50 am
Forum: Civil Aviation
Topic: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff
Replies: 829
Views: 234999

Re: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff

I would look at an interval of 2021-01-09 07:40:12Z.214 to 14Z022. Plane looses 750 feet = 230 meters in 2 seconds starting from level flight. That is 10g of acceleration, if you take those numbers at face value. If you choose 17Z.146 as an end point, it is 770 meters in less than 5 seconds, that i...

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by prebennorholm
Sat Jan 09, 2021 5:03 am
Forum: Non-Aviation
Topic: Does Trump have sufficient capacity to continue?
Replies: 138
Views: 7028

Re: Does Trump have sufficient capacity to continue?

Can someone just give a wild guesstimate: What are the odds that Trump will be arrested (for whatever crime(a)) after he leaves office? I just want him out of public influence forever! Trump isn't THE problem. Among millions of random people there will always be people like Trump. The problem is a ...

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by prebennorholm
Sat Jan 09, 2021 4:30 am
Forum: Non-Aviation
Topic: Pro-Trump Riot in US Capital Building
Replies: 985
Views: 52737

Re: Pro-Trump Riot in US Capital Building

Rick Wilson brings up an excellent point... The question is, should Merrick Garland go after Trump and former Trump admin. officials? Huh, the only lasting cure is that the GOP transforms in a way which makes it impossible to nominate a candidate as they did in 2015. There were at least a quarter b...

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by prebennorholm
Sat Jan 09, 2021 3:28 am
Forum: Civil Aviation
Topic: RR freezing development on the Ultrafan program
Replies: 46
Views: 9915

Re: RR freezing development on the Ultrafan program

Had some questions about the Variable Pitch Fan for the Ultrafan moving forward: First, if it will cause an actual reversal of flow at the fan stage, then how does that avoid pulling from the core, and (1) stalling out combustion, while (2) exposing forward parts to heated gases? Is there actually ...

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by prebennorholm
Thu Jan 07, 2021 4:06 am
Forum: Non-Aviation
Topic: Pro-Trump Riot in US Capital Building
Replies: 985
Views: 52737

Re: Pro-Trump Riot in US Capital Building

I'm a proud Republican who has voted 4 times against Donald Trump. I'm appalled by today's events. As far as I'm concerned, Trump should be impeached, removed from office, and prohibited from ever holding public office in the United States! Huh, you have a huge job in front of you. You have to repa...

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by prebennorholm
Thu Jan 07, 2021 3:41 am
Forum: Non-Aviation
Topic: Pro-Trump Riot in US Capital Building
Replies: 985
Views: 52737

Re: Pro-Trump Riot in US Capital Building

It's probably no coincidense that one, and only one, riotter got shot and died today. Hearing a shot and seeing a riotter falling from the window which she was climbing through, that likely had some effect on changing the minds of other riotters who might have got the same idea. Only lemmings commit...

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by prebennorholm
Wed Jan 06, 2021 11:34 pm
Forum: Non-Aviation
Topic: Pro-Trump Riot in US Capital Building
Replies: 985
Views: 52737

Re: Pro-Trump Riot in US Capital Building

Why do we tend to give unfit names to things? Example: "German Democratic Republic" to one of the world's worst dictatorships. And now the land area which separates Canada from Mexico. "United States of America"? "States of America", sure yes. But "United" ???...

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by prebennorholm
Sat Jan 02, 2021 3:37 am
Forum: Non-Aviation
Topic: Brexit part XI: 2021
Replies: 648
Views: 34230

Re: Brexit part XI: 2021

I don't know, but if the government expects the economy to bounce back quickly once the virus is under control, it might be a good idea to give a lifeline to as many people and companies as possible. I include all countries in this of course, for example my president, Macron, repeats quite often th...

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by prebennorholm
Sun Dec 27, 2020 2:27 am
Forum: Civil Aviation
Topic: Nordic Aviation - 2020
Replies: 1103
Views: 187347

Re: Nordic Aviation - 2020

I imagine that Sweden will fine British Airways a pile of cash... BA will grovel in the hope of reducing the fine.... and somebody at BA will get shouted at / fired Nah, this is all east of the Atlantic. The lawyers don't get fifty percent of the revenue, and Swedish judges don't take bribes. Maybe...

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by prebennorholm
Mon Dec 21, 2020 3:59 am
Forum: Civil Aviation
Topic: COVID-19 Aviation Related News & Discussion Thread - Q4 2020
Replies: 321
Views: 27352

Re: COVID-19 Aviation Related News & Discussion Thread - Q4 2020

Looks like the travelling from the UK to anywhere in the world will be impossible very soon. Denmark now also banned flights from the UK. Nine examples of the N501Y mutation have already been identified in Denmark, and they were properly reported to the WHO. Therefore Turkey has banned flights also...

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by prebennorholm
Mon Dec 21, 2020 1:28 am
Forum: Civil Aviation
Topic: Air Greenland places Christmas order for an A330neo
Replies: 72
Views: 11181

Re: Air Greenland places Christmas order for an A330neo

Thanks for the info. So the next question is, where does the money come from to pay for the new airplane. There must be some sort of financing arranged to pay for the aircraft. thanks again. Huh, Air Greenland is a 60 years old company with 27 aircraft, some 400,000 pax/yr, and operating with profi...

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by prebennorholm
Sun Dec 20, 2020 3:38 am
Forum: Civil Aviation
Topic: Air Greenland places Christmas order for an A330neo
Replies: 72
Views: 11181

Re: Air Greenland places Christmas order for an A330neo

...the A330 currently flies to Søndre Strømfjord, which lies so isolated that most passengers have to be shuttled onwards in the Dash 8-200s ... For those with only a B grade in geography, "Søndre Strømfjord" is the same as Kangerlussuaq, Danish and Inuit language repectively. It was foun...

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by prebennorholm
Sun Dec 20, 2020 2:10 am
Forum: Civil Aviation
Topic: Air Greenland places Christmas order for an A330neo
Replies: 72
Views: 11181

Re: Air Greenland places Christmas order for an A330neo

Who owns Air Greenland? The Greenland government owns the company 100%. Until a couple of years ago the official ownership was split between the Greenland and Danish governments, with SAS also somehow involved on the sideline. But during the later years more and more services have been transfered t...

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by prebennorholm
Sun Dec 20, 2020 1:22 am
Forum: Civil Aviation
Topic: Air Greenland places Christmas order for an A330neo
Replies: 72
Views: 11181

Re: Air Greenland places Christmas order for an A330neo

Will they get lie-flat business class seat on the new A338? I guess not. A few times when passing CPH I happened to pass by the gate where the current Air Greenland A332 was going to dock or had just docked. What I noticed at the gate was a fleet of a couple of dozen wheel chairs and sometimes a fe...

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by prebennorholm
Sat Dec 19, 2020 2:13 am
Forum: Civil Aviation
Topic: Air Greenland places Christmas order for an A330neo
Replies: 72
Views: 11181

Re: Air Greenland places Christmas order for an A330neo

Still, 22 years is still not very old. So surprised that they're replacing it. To oldJoe's point, you can't keep it forever, but this should have a lot more left on its service life. No doubt this fleet renewal is timed to fit with the extention of the runway at Nuuk Airport from 950m to 2,220m. 2,...

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by prebennorholm
Wed Dec 16, 2020 5:16 am
Forum: Military Aviation & Space Flight
Topic: Rocket engine service life
Replies: 7
Views: 1070

Re: Rocket engine service life

I can't find data on the service life of rocket engines. They are usually not designed to last long, anyway. But if an LH2/LOX engine were designed for refuel and reuse in space, how many minutes of burn time do you reckon could it withstand before becoming unsafe? .... if an LH2/LOX engine were de...

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by prebennorholm
Mon Dec 14, 2020 3:40 am
Forum: Military Aviation & Space Flight
Topic: Chuck Yeager: First pilot to fly supersonic dies aged 97
Replies: 24
Views: 1812

Re: Chuck Yeager: First pilot to fly supersonic dies aged 97

RIP Chuck. You know you're a good test pilot when you die of old age... As Chuck said it himelf, the game is to avoid to become a street name. In his active years it was a habit to name the streets on Edward AFB after less lucky test pilots. But they soon ran out of streets to name. The base itself...

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by prebennorholm
Sat Dec 12, 2020 1:37 am
Forum: Non-Aviation
Topic: Brexit Part IX: Final rush to No Deal
Replies: 2560
Views: 169653

Re: Brexit Part IX: Final rush to No Deal

At the Thursday EU summit in Brussels Ursula von der Leyen gave a briefing of her Wednesday talks with Johnson. Based on that the Danish govt today (Friday) adviced Danish businesses to initiate all relevant administrative preparations for a hard Brexit as anything else is considered highly unlikely...

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by prebennorholm
Sat Dec 12, 2020 12:09 am
Forum: Civil Aviation
Topic: Norwegian News and Discussion - 2020
Replies: 1064
Views: 177193

Re: Norwegian News and Discussion - 2020

I honestly cannot believe this airline is still in business. For most practical things the old Norwegian also is not in business any longer. It's a new and mostly different airline with identical name. Six months ago it was bought by its leasing companies, as unpaid leasing fees were converted into...

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by prebennorholm
Thu Dec 10, 2020 4:51 am
Forum: Non-Aviation
Topic: New Tunnel in Faore Islands Opening Soon
Replies: 34
Views: 1877

Re: New Tunnel in Faore Islands Opening Soon

I just do not understand the roundabout. If a tunnel goes from point A to point B and not point A to either point B or point C, what is the point of the roundabout? They could have made that art without a roundabout. The tunnel does connect three points. About 80% of the tunnel connects Hvitanes to...

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by prebennorholm
Wed Dec 09, 2020 1:20 am
Forum: Civil Aviation
Topic: Northwest DC-7C Crashes in the Early-1960s
Replies: 15
Views: 3781

Re: Northwest DC-7C Crashes in the Early-1960s

WA707atMSP wrote:
The DC-6 was more reliable, and required less maintenance, so airlines chose to keep their DC-6s and phase out their DC-7s.

Fifty years ago there was a joke telling:

    DC-6 - a four engined plane with three blades propellers
    DC-7 - a three engined plane with four blades propellers

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by prebennorholm
Mon Dec 07, 2020 4:51 am
Forum: Technical/Operations
Topic: First plane that needed software?
Replies: 56
Views: 5482

Re: First plane that needed software?

Punch cards are still software. No, it isn't. Punched cards are a data storage medium. And only accessible sequentially like tape reels, unlike randomly accessible media like floppies, harddisk, CD, etc. Software is a set of processor instructions data which tells a computer or robot how to work. I...

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by prebennorholm
Sun Dec 06, 2020 2:43 am
Forum: Non-Aviation
Topic: Brexit Part IX: Final rush to No Deal
Replies: 2560
Views: 169653

Re: Brexit Part IX: Final rush to No Deal

Carney head of BOE at the time of the Referenda suggested that a vote to leave the EU the UK will enter a technical recession which never materialised until coronaviruis hit. I'm not sure about the definition of a "technical recession". But on the day back in 2015 when Cameron announced t...

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by prebennorholm
Sun Nov 29, 2020 11:20 pm
Forum: Non-Aviation
Topic: Tunnel Planned Between Denmark and Germany
Replies: 60
Views: 3706

Re: Tunnel Planned Between Denmark and Germany

This tunnel seems like a no brainer, why 30 years of legal battles ? German re-unification. Denmark has been pressing for this tunnel for decades, but since 1990 Germany certainly had other infrastructure jobs on higher priority. In 1990 East Germany was a complete mess. It has been immensely expen...

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by prebennorholm
Sun Nov 29, 2020 1:37 am
Forum: Non-Aviation
Topic: Tunnel Planned Between Denmark and Germany
Replies: 60
Views: 3706

Re: Tunnel Planned Between Denmark and Germany

https://eur-lex.europa.eu/legal-content ... 32004L0054
-->

ArchGuy1 wrote:
What makes it safe to build a road tunnel at this length?

EU Directive No. 2004/54/EC

https://eur-lex.europa.eu/legal-content ... 32004L0054

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by prebennorholm
Sat Nov 28, 2020 11:54 pm
Forum: Civil Aviation
Topic: U.S. Airlines that Flew 737Max Pre-Grounding - Any Reported Issues?
Replies: 2
Views: 1347

Re: U.S. Airlines that Flew 737Max Pre-Grounding - Any Reported Issues?

I've never seen this addressed as I (admittedly) scanned various threads about the Max grounding, but did any U.S. carriers flying the Max before the grounding experience any notable issues with the aircraft? An AoA sensor normally works perfectly well about 99.9999% of the time. If a U.S. carrier ...

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by prebennorholm
Thu Nov 26, 2020 1:44 am
Forum: Non-Aviation
Topic: Tunnel Planned Between Denmark and Germany
Replies: 60
Views: 3706

Re: Tunnel Planned Between Denmark and Germany

Is it just me, or does 7 billion euro seem rather low for a project of this scope? Huh, it is a major project, but hardly a world scattering one. To put it in perspective, it is exactly a five times longer version of the 3.5 km tunnel which makes the minor western part of the Øresund Bridge. The sa...

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by prebennorholm
Thu Nov 26, 2020 12:37 am
Forum: Military Aviation & Space Flight
Topic: AE2100 military designation?
Replies: 7
Views: 1299

Re: AE2100 military designation?

Impressive, Sheikh, what you know about the 135. Tnx! I know you claimed above that "P" had been used, but I haven't found one yet. Pics or it never happened! :rotfl: 1928976 There you are. There are more pics at abpic.co.uk and airphotographicinternational.com, so I assume it isn't a typo.

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by prebennorholm
Wed Nov 25, 2020 2:30 am
Forum: Civil Aviation
Topic: Skydive Perris DC-9-20 Preparing for Return!
Replies: 62
Views: 13977

Re: Skydive Perris DC-9-20 Preparing for Return!

I remember we welcomed my father after a business trip in KRP, Denmark in 1998, and he came with the DC-9 - 21. My father complained it was a loud old thing. Sounded cool. Going to KRP in 1998 on a DC-9 the pax would jump on the plane as a flock of chicken. No seat allocation. The experienced trave...

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by prebennorholm
Wed Nov 25, 2020 12:34 am
Forum: Civil Aviation
Topic: Norwegian News and Discussion - 2020
Replies: 1064
Views: 177193

Re: Norwegian News and Discussion - 2020

Norwegian just announced they are furlough 1600 employees and reducing the active fleet from 21 to 6 aircraft, basically going back to a scaled down and minimum Norwegian domestic network, similar to the one in April/May From today Norwegian is back in Denmark again - on CPH-OSL and CPH-AAL. Wonder...

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