Search found 6769 matches

by cpd
Mon Aug 02, 2021 8:08 pm
Forum: Travel, Polls & Preferences
Topic: Any airliners you boarded by means of mobile airstairs?
Replies: 38
Views: 1335

Re: Any airliners you boarded by means of mobile airstairs?

Biggest was Emirates 777-300ER in Dubai. Enter at the front door the walk to the right aisle and immediately to seat 1F. :)

Similar in Geneva, we always leave via stairs.

Also done the same on a Qantas 767 which flown by Capt. Sutton on that day.

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by cpd
Sun Aug 01, 2021 11:08 am
Forum: Non-Aviation
Topic: Simone Biles Withdraws from Olympics
Replies: 42
Views: 1819

Re: Simone Biles Withdraws from Olympics

L410Turbolet wrote:
Why is her whining making headlines for a week? She is not the only that quit the Olympics, is she?


Can we see a list of your Olympic results or other international competition achievements so we can see your qualifications to make such statements.

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by cpd
Thu Jul 29, 2021 8:22 pm
Forum: Non-Aviation
Topic: Simone Biles Withdraws from Olympics
Replies: 42
Views: 1819

Re: Simone Biles Withdraws from Olympics

Has the OP also won medals at the Olympics? Or competed as an elite athlete? If not… I hope she can sort out what’s wrong - clearly you wouldn’t abandon all that preparation for nothing. I’ve heard of athletes also having enough of elite sport and going back into normal life doing a normal job. The...

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by cpd
Wed Jul 28, 2021 8:00 pm
Forum: Non-Aviation
Topic: Simone Biles Withdraws from Olympics
Replies: 42
Views: 1819

Re: Simone Biles Withdraws from Olympics

Has the OP also won medals at the Olympics? Or competed as an elite athlete? If not… I hope she can sort out what’s wrong - clearly you wouldn’t abandon all that preparation for nothing. I’ve heard of athletes also having enough of elite sport and going back into normal life doing a normal job. The ...

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by cpd
Tue Jul 27, 2021 11:24 am
Forum: Non-Aviation
Topic: Heavy explosion, CHEMPARK, Leverkusen, Germany
Replies: 12
Views: 853

Re: Heavy explosion, BAYER chemical park, Leverkusen, Germany

What sort of stuff are they dealing with at that place? In my old work I used to have some knowledge of old contaminated sites and a few of those had some frankly horrific stuff in them… extremely hazardous/deadly stuff. But that was how things were in the old days. Now we are a bit wiser to those t...

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by cpd
Mon Jul 26, 2021 8:06 pm
Forum: Non-Aviation
Topic: Olympic - i.e., summer - Olympic athletes complain of... heat
Replies: 37
Views: 1989

Re: Olympic - i.e., summer - Olympic athletes complain of... heat

There’s a huge difference between wearing something on your own time/choice and the IOC issuing a fine because your shorts are too long. Honestly, give 1 good reason why they absolutely MUST wear the bikini bottom style. The IOC didn’t issue the Norwegian beach handball women a fine, the European H...

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by cpd
Mon Jul 26, 2021 7:58 pm
Forum: Non-Aviation
Topic: Mental Health Tip: Pay Less Attention to News
Replies: 30
Views: 1297

Re: Mental Health Tip: Pay Less Attention to News

I don’t watch a lot of news. I do read quickly some news websites, just the main ones that are important for the daily issues related to my work and/or the current lockdown situation. Where I live we have a hard lockdown at the moment because there is a bad outbreak of the virus and people are diein...

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by cpd
Mon Jul 26, 2021 5:56 am
Forum: Non-Aviation
Topic: Olympic - i.e., summer - Olympic athletes complain of... heat
Replies: 37
Views: 1989

Re: Olympic - i.e., summer - Olympic athletes complain of... heat

Ever tried doing anything in 100F heat? Even sitting is exhausting. As far as clothing choices, women are wearing more and more because they are tired of being sexualized and want to be taken seriously. Yes, I'd ride home from work (50km) on a bicycle at 4:30pm in the afternoon in summer in 40ºC at...

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by cpd
Sun Jul 25, 2021 6:07 am
Forum: Non-Aviation
Topic: Olympic - i.e., summer - Olympic athletes complain of... heat
Replies: 37
Views: 1989

Re: Olympic - i.e., summer - Olympic athletes complain of... heat

Aaron747 wrote:
It just dawned on me - were these athletes seriously preparing for over two years for an event without anyone on the team checking what Tokyo weather is like in summer? Unbelievable.


The Australian team was preparing for it.

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by cpd
Sun Jul 25, 2021 12:30 am
Forum: Non-Aviation
Topic: Olympic - i.e., summer - Olympic athletes complain of... heat
Replies: 37
Views: 1989

Re: Olympic - i.e., summer - Olympic athletes complain of... heat

Airstud wrote:
Participants in the Games have a few things to say about the high temperatures and humidity currently wracking the Tokyo area.


Alright, let's have you ride a bicycle flat out on a 1.5km course for 45 minutes, with a bell lap at the end in 40ºC and see how you feel at the end.

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by cpd
Sat Jul 17, 2021 3:41 am
Forum: Non-Aviation
Topic: Texas House Republicans vote to track down absent Democrats and arrest them if necessary
Replies: 102
Views: 6529

Re: Texas House Republicans vote to track down absent Democrats and arrest them if necessary

Have you guys who think this is really bad ever considered that in a democracy the winner of an election gets to set the rules - whether you as an individual likes the rules or not? Change the rule makers to change the rules. The problem occurs when the "winners" decide that an open democ...

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by cpd
Thu Jul 15, 2021 1:58 am
Forum: Photography Feedback
Topic: Night/Dusk/Dawn Confirmation
Replies: 2
Views: 257

Re: Night/Dusk/Dawn Confirmation

Hi, Just added this photo to the queue, can I double check whether it should fit the "Night/Dusk/Dawn" category? It was taken about 30 mins prior to sunset and the sun is quite low in the horizon already, although there is still enough sun to light the plane. The reason I ask is because t...

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by cpd
Mon Jul 12, 2021 9:48 am
Forum: Non-Aviation
Topic: COVID-19 Vaccine News and Discussion Thread
Replies: 2529
Views: 170102

Re: COVID-19 Vaccine News and Discussion Thread

My area is in a lockdown, you can only go out for essential goods, 1 person from a household can go to the supermarket. Exercise allowed outside but only within local government area or 10km radius. The cases are going up quickly. Our government put in a pretty soft-lockdown to begin with and nobody...

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by cpd
Sun Jul 11, 2021 7:40 pm
Forum: Civil Aviation
Topic: Lufthansa considering to bring back five A380 in 2022
Replies: 36
Views: 10680

Re: Lufthansa considering to bring back five A380 in 2022

YAY!!!!! Back in 2017, I booked my trip to Germany on LH with the 747-8. Absolutely no regrets; however, I remember thinking, "yeah, the 747 might be gone soon, and the A380 will be around for a while..." How quickly the world changed. But at least my next trip can be on one from LAX! Que...

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by cpd
Thu Jul 08, 2021 10:16 am
Forum: Non-Aviation
Topic: Research Indicates Four-Day Workweeks Are Win-Win
Replies: 41
Views: 1665

Re: Research Indicates Four-Day Workweeks Are Win-Win

There is no federal law requiring any kind of sick leave. It's up to companies, and sometimes state law, as to whether sick time counts as regular paid time off or is something on its own. That is one of the things I do not get about US corporate culture. If you are sick, you are sick. That is not ...

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by cpd
Fri Jul 02, 2021 10:23 pm
Forum: Non-Aviation
Topic: Fast food Fish
Replies: 24
Views: 1999

Re: Fast food Fish

Fast food fish...is not a real thing. Ok, ok, I know it's on the menu, but really? As a New Zealander I disagree, fish and chips is an integral part of our culture, Australians and British would also agree. Where I used to work, the local fish and chips place (which also sold fish to cook at home) ...

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by cpd
Thu Jul 01, 2021 2:58 am
Forum: Non-Aviation
Topic: Miami Condo Partially Collapsed
Replies: 158
Views: 12068

Re: Miami Condo Partially Collapsed

And another example of building problems, although this is a new building - about 800m away from where my work is: https://www.abc.net.au/news/2021-07-01/nsw-parramatta-twin-towers-development-defects/100255704 I would ride to work past that building a lot of mornings. 9 Hassall Street Parramatta. W...

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by cpd
Wed Jun 30, 2021 8:08 pm
Forum: Non-Aviation
Topic: Fast food Fish
Replies: 24
Views: 1999

Re: Fast food Fish

Got to give the nod to Arby's I usually never get fish but during lent I do. McDonalds used to be decent now it sucks and the rest of the chains just average. Discuss. McDonald’s? Come on there is better than that. In Sydney you’d get proper fish and chips. We have Penrith Seafoods near me that doe...

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by cpd
Wed Jun 30, 2021 8:04 pm
Forum: Civil Aviation
Topic: Australian Aviation Thread - June 2021
Replies: 265
Views: 40285

Re: Australian Aviation Thread - June 2021

"Dogs and cats may soon travel in the cabin on domestic flights" https://www.executivetraveller.com/news/dogs-and-cats-may-soon-travel-in-the-cabin-on-domestic-flights CASA will now let airlines decide if they allow animals other than service dogs to travel in the cabin instead of in the ...

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by cpd
Mon Jun 28, 2021 8:12 pm
Forum: Non-Aviation
Topic: My Doctor Tried To Talk Me Out Of Getting A COVID Vaccine
Replies: 104
Views: 7872

Re: My Doctor Tried To Talk Me Out Of Getting A COVID Vaccine

While on a routine visit, my doctor told me that she won’t be getting the vaccine and told me I shouldn’t either. It was strange because during all of this she swore up and down that she wasn’t one of those “anti-vaxx” people. I was left baffled and even more confused when I walked past her office ...

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by cpd
Mon Jun 28, 2021 4:00 am
Forum: Civil Aviation
Topic: The Giant aircraft That Failed
Replies: 59
Views: 18946

Re: The Giant aircraft That Failed

Turboprops (with the obvious exception of Tu-114/Tu-95 family) have a lower speed than jets. It's kind of a "Captain Obvious" statement, and yes, passengers like to reach their destinations faster. But there's also a CAPEX issue. If you try to do long haul in head-to-head competition of s...

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by cpd
Sat Jun 26, 2021 9:58 pm
Forum: Non-Aviation
Topic: COVID-19 Non Aviation Thread - Q2 2021
Replies: 447
Views: 36491

Re: COVID-19 Non Aviation Thread - Q2 2021

Sydney, a major metropolis in total lockdown because of 80 cases. This must be the embodiment of insanity to restrict the basic right to free movement due to a handful of cases. Fortunately this sort of madness proposed by doctors were shot down in Denmark. Is it YOUR major metropolis or not? (Yes ...

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by cpd
Sat Jun 26, 2021 7:24 pm
Forum: Non-Aviation
Topic: 'Long Covid' news and discussion
Replies: 36
Views: 2674

Re: 'Long Covid' news and discussion

I think one of the biggest impacts of the coronavirus will be the mental health impact on younger people. And the amount of money being thrown on that is pittance compared to the vaccines. Actually at least here they seem to be really resilient. Sure things have changed and their learning/education...

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by cpd
Fri Jun 25, 2021 7:04 pm
Forum: Civil Aviation
Topic: The Giant aircraft That Failed
Replies: 59
Views: 18946

Re: The Giants That Failed

This is a great thread, thank you for putting it together. I may be an outlier, but I think it would be fun if you could somehow furnish an A380 with amenities like a cruise ship And hop to different destinations. I know it would be prohibitively expensive, especially as the fleet gets drawn down b...

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by cpd
Fri Jun 25, 2021 6:11 am
Forum: Civil Aviation
Topic: The Giant aircraft That Failed
Replies: 59
Views: 18946

Re: The Giant aircraft That Failed

Another failure was the Rolls Royce Griffith supersonic vertical take off airliner.

No way that could have been successful. Designed by Dr A.A. Griffith. It was never built.

56 engines (!!!) for vertical takeoff and 12 for cruise flight…. Hmm…

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by cpd
Wed Jun 23, 2021 3:19 am
Forum: Civil Aviation
Topic: New Zealand Aviation Thread - June 2021
Replies: 324
Views: 32327

Re: New Zealand Aviation Thread - June 2021

Time is running out to save the last Air NZ 747 from the wrecking ball. "Race against time: 18 days to save Air NZ's last 747 | Stuff.co.nz" https://i.stuff.co.nz/travel/news/300338815/race-against-time-18-days-to-save-air-nzs-last-747 I’m afraid they won’t make it. Last I looked it was a...

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by cpd
Wed Jun 23, 2021 12:19 am
Forum: Non-Aviation
Topic: 'Long Covid' news and discussion
Replies: 36
Views: 2674

Re: 'Long Covid' news and discussion

Possibly people remain medically damaged after Covid, which I have no comment on So the guy in Sydney who was very fit, rode bikes a lot then unfortunately got COVID and ended up with heart problems and seizures after it is, by the rest of your post probably wrong? He was also a doctor and took all...

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by cpd
Tue Jun 22, 2021 7:57 pm
Forum: Non-Aviation
Topic: Tucker Carlson and Right Wing Media Insinuate 'FBI Operatives' Behind Capitol Riots
Replies: 56
Views: 4164

Re: Tucker Carlson and Right Wing Media Insinuate 'FBI Operatives' Behind Capitol Riots

Tucker Carlson seemed a bit less in love with Trump than the average Fox host, criticizing him sometimes, but now that Trump has lost, Tucker has decided to go full crazy for some reason. Maybe a retirement plan, make some more millions for a couple more years then disappear into the sunset ? For t...

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by cpd
Tue Jun 22, 2021 11:27 am
Forum: Civil Aviation
Topic: New Zealand Aviation Thread - June 2021
Replies: 324
Views: 32327

Re: New Zealand Aviation Thread - June 2021

Time is running out to save the last Air NZ 747 from the wrecking ball. "Race against time: 18 days to save Air NZ's last 747 | Stuff.co.nz" https://i.stuff.co.nz/travel/news/300338815/race-against-time-18-days-to-save-air-nzs-last-747 I’m afraid they won’t make it. Last I looked it was a...

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by cpd
Mon Jun 21, 2021 1:25 pm
Forum: Civil Aviation
Topic: CFM Open Rotor concept demonstrator (UDF)
Replies: 7
Views: 1574

Re: CFM Open Rotor concept demonstrator (UDF)

This is the re-birth of the UDF engines from the 80s. GE's contribution being the most developed UDF program ever made, with a lot of flight testing data to build a brand new version of the same concept with modern materials and knowledge. The risks of such engines aren't far removed from failure r...

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by cpd
Sun Jun 20, 2021 7:59 pm
Forum: Civil Aviation
Topic: CX Working With Airbus on Single-Pilot System for A350 With 2025 EIS
Replies: 254
Views: 22599

Re: CX Working With Airbus on Single-Pilot System for A350 With 2025 EIS

Oh please. 100 years ago people didn’t believe heavier than air flight was possible. Maybe we should have stayed grounded all this time. First manned heaver than air flight happened around 240 years ago, world war 1 finished over 100 years ago where fighter, transport, resonance, and bomber aircraf...

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by cpd
Fri Jun 18, 2021 7:39 pm
Forum: Military Aviation & Space Flight
Topic: Another Boeing-Airbus tanker war is coming soon, KC-Y
Replies: 220
Views: 18374

Re: Another Boeing-Airbus tanker war is coming soon, KC-Y

DoD might be in a single bid position, if LM / Airbus feel there's no serious competition and Boeing will get the contract no matter how bad their track record, reliability and competitive performance. Airbus won all 1-1 competitions globally since the launch of the MRTT, is cleared for almost all ...

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by cpd
Tue Jun 15, 2021 12:07 am
Forum: Civil Aviation
Topic: Pratt & Whitney - Future widebody engine?
Replies: 28
Views: 3887

Re: Pratt & Whitney - Future widebody engine?

Maybe the only way for them is to team up with an outsider, not one of the big two and work on some totally disruptive plane and engine combination.

That’s risky and expensive.

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by cpd
Sat Jun 12, 2021 10:59 am
Forum: Non-Aviation
Topic: Latest in the California High Speed Rail Saga: Single-Track Operation
Replies: 138
Views: 8702

Re: Latest in the California High Speed Rail Saga: Single-Track Operation

HSR will not work nation wide. I completely agree. HSR must be only in corridors. EUG-PDX-SEA and SFO-LAX and LAX-LAS and MCI-STL-CHI with a few stops at larger communities. There are people who live in the San Juaquin Valley that work in SJC and SFO and OAK. Rail makes sense over these short dista...

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by cpd
Fri Jun 11, 2021 10:20 pm
Forum: Non-Aviation
Topic: Texas valedictorian speaks for in support of reproductive rights of women.
Replies: 23
Views: 1346

Re: Texas valedictorian speaks for in support of reproductive rights of women.

Very brave of her to do that especially in a state like Texas, but note from the article: The speech has prompted the Richardson Independent School District to reevaluate its set of protocols for student speeches. So I imagine any politically-charged speech will likely have to be reviewed going for...

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by cpd
Thu Jun 10, 2021 9:46 am
Forum: Civil Aviation
Topic: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?
Replies: 92
Views: 14025

Re: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?

Indeed, as recounted here; https://www.youtube.com/watch?v=B09xMixpPFM To the questions around the TU-144 and it's development and possible link to bombers, one of the many things that were not satisfactory about the TU-144, was air intake control. They approached BAC the system designers for Conco...

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by cpd
Thu Jun 10, 2021 2:27 am
Forum: Civil Aviation
Topic: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?
Replies: 92
Views: 14025

Re: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?

BOAC actually used Mosquitoes during WW2 to carry I think just one VIP who sat in the bomb bay breathing oxygen, these flights were made to neutral countries in Europe Indeed, as recounted here; https://www.youtube.com/watch?v=B09xMixpPFM To the questions around the TU-144 and it's development and ...

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by cpd
Wed Jun 09, 2021 6:55 am
Forum: Civil Aviation
Topic: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?
Replies: 92
Views: 14025

Re: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?

I didn’t see anyone mention the the famous ex-SAHA AIR ex-military 707s converted to airline use...even though SAHA is owned by the Iranian military. But some of their ex-707 fleet were formerly air-to-air refuelers. They must have been awfully cramped considering the 707 tanker used the original, ...

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by cpd
Tue Jun 08, 2021 8:08 pm
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

To answer posts 420 and 429; We never got to see how the GE4 would have performed in flight, however it had a shock cone design for the intake control, similar to the SR-71. Though the eventual Mach 3 FAA requirement for a US SST was dropped to Mach 2.7, might have influenced that design decision. ...

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by cpd
Tue Jun 08, 2021 4:11 am
Forum: Civil Aviation
Topic: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?
Replies: 92
Views: 14025

Re: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?

I found a few wonderful sites with well sourced articles on the B-17 bomber conversions in Scandinavia and their long years of work. With a few amazing photos of their interiors as well, which is very rare. I highly recommend giving them a read. This was very fascinating, it looks decent enough ins...

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by cpd
Tue Jun 08, 2021 12:34 am
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

Concorde piggy-backed off military technology , Boom's main and perhaps only hope is the US DoD becoming interested in helping them develop their project and thus their engine. It's pretty clear that by the time any Boom could be in service the next generation of subsonic jet engines should be read...

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by cpd
Mon Jun 07, 2021 8:21 pm
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

Concorde piggy-backed off military technology, Boom's main and perhaps only hope is the US DoD becoming interested in helping them develop their project and thus their engine. It's pretty clear that by the time any Boom could be in service the next generation of subsonic jet engines should be ready...

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by cpd
Mon Jun 07, 2021 6:50 am
Forum: Civil Aviation
Topic: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?
Replies: 92
Views: 14025

Re: Passenger converted bomber aircraft in civilian service - Stories, facts, interiors?

I cannot attest to truthfulness of the idea that "Tu-144 actually began as a supersonic bomber concept which got dusted off". Maybe it did, but all I know was that Tupolev was working on Tu-144 specifically as a pax plane, period. I meant it in the absolutely loosest sense. R&D that w...

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by cpd
Mon Jun 07, 2021 3:55 am
Forum: Non-Aviation
Topic: New phone- help me choose
Replies: 29
Views: 1391

Re: New phone- help me choose

I find the highest end devices too expensive for what they do. But I'm not spending hours on my phone every day, so that might play a role. I can't really afford them (I could, but that would mean cutting something else) but even if I could, I would only buy them for the convenience of "I buy ...

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by cpd
Sun Jun 06, 2021 8:03 pm
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

When Concorde was first in the market the citizenry of the world had to work to get their government’s to pay attention to their environmental concerns. In this decade environmental concerns are at the forefront of governments and a lot of consumers. I just can’t see a lot of jurisdictions saying ‘...

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by cpd
Sun Jun 06, 2021 1:13 pm
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

This is interesting. 'Air Force Two' Replacement Dropped With Funds Redirected To Supersonic Transport Research https://www.thedrive.com/the-war-zone/40912/air-force-two-replacement-dropped-with-funds-redirected-to-supersonic-transport-research So it becomes a government backed prestige project rat...

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by cpd
Sat Jun 05, 2021 8:04 pm
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

But the thing is that Boom has a prototype ready to start flying soon, they went ahead of the curve with the prototype with that they will get feedback for the construction of Overture, people said the same thing with the Boeing 747, and look it's flying today. I feel Boom is going to be like Space...

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by cpd
Sat Jun 05, 2021 10:04 am
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

https://photos.smugmug.com/photos/i-qQP5SLm/0/601684ff/X3/i-qQP5SLm-X3.jpg That's who had options on Concorde. Feel free to disagree with it, that's from the manufacturer itself. I don't know exactly when that brochure was printed (and there are other pages of it) but it's very, very old. That broc...

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by cpd
Fri Jun 04, 2021 10:12 pm
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

https://photos.smugmug.com/photos/i-qQP5SLm/0/601684ff/X3/i-qQP5SLm-X3.jpg That's who had options on Concorde. Feel free to disagree with it, that's from the manufacturer itself. I don't know exactly when that brochure was printed (and there are other pages of it) but it's very, very old. That broc...

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by cpd
Fri Jun 04, 2021 3:24 am
Forum: Civil Aviation
Topic: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)
Replies: 460
Views: 64022

Re: United orders supersonic planes from Boom (was: Big United Announcement Coming Up?)

This might be a silly question, but I hear people arguing that the aircraft won't ever be permitted flying over land at all. Why is that? I thought a sonic boom only happened when an aircraft reaches the speed of sound, and when leaving the speed of sound. It doesn't happen the entire flight. Liste...

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