You bet it’s the same in many ways. Boeing boasted to its customers that commonality between the 707, 727 and 737 was something like 80%. The centre pedestal of a 737 Max is identical to that of a 707. That so much of a 707 is still on the production line in 2021 shows how right that version of Boe...Jump to post
My humble opinion is that converted 777Ws and A330s will haul the majority of our packages in the future. Efficient, available for cheap soon and the range can be traded for payload.
Same story as the 747, MD11, A300 and 767.
OK, but that still doesn't answer the question: is the 15-35°C ideal temp range internal or external? Or both? Batteries could be designed to "naturally" maintain its temperature in the ideal range during operation (via the normal heating caused by current draw) despite the external temp ...Jump to post
I think there is a persistant physics problem. https://4.bp.blogspot.com/-Xp4eE25PIW0/VxpkxXONpFI/AAAAAAABIaw/orfNx-za9cMrAGxQsS574IgUsgh0rVMVACLcB/s1600/fuelcompared.png Battery energy density didn't really boom over the last 40 years, despite billions being invested by innovative companies all ov...Jump to post
The main advantage the MD11 had against the 777 is that it is much better looking.Jump to post
If they want to gamble they should make a 20 seat, short range, electric prop.Jump to post
Don't trust people who say it it over or under valued. Few, if any, can predict future stock prices except that it is likely that they will go up over a looong time period. The important thing to understand is that the airline industry is a high risk sector now. So potential for both high wins and l...Jump to post
The A350-1000 has a lower aspect ratio wing than the 900 (9.03 vs. 9.49 according do Wikipedia). I guess that could affect max altitude?Jump to post
At the end of each month I always re-balance so I have 30% cash, 70% stocks (generic global funds). I see no reason to change my strategy.Jump to post
kimimm19 wrote:I thought SAS shorthaul was already low cost....
It's the model BA adopted.
I think we have reached the current technology limits. See what happened to the new generation planes' engine on 320Neo; 787 and 777X..... I remember when I was a kid and SAS crashed an MD80 due to ice ingestion. Some SAS pilots complained about that the MD80 had too advanced and sensitive engines ...Jump to post
A human powered blimp would be cool. No effort for staying up in the air required. You could fly around with little effort and enjoy the view. But a quick calculation gives that a 6 meter diameter sphere would be required to lift 120 kg of blimp and human. Would turn out pretty wind sensitive. And h...Jump to post
At my company we are not allowed to travel to or via Hong Kong anymore. Exceptions need written management approval. Also, there has been reports of confiscated laptops. So laptops and mobile phones must now be completely cleared of company information before entering China.Jump to post
SierraPacific wrote:Wait am I reading that they still need 500 million dollars to start producing aircraft for customers?
If so, I don't see this ending with this airplane in service anywhere.
I think it is because the models are new. They minimized the weight of the interior, then some parts will wear out earlier than estimated and then be reinforced for future deliveries. I remember the same problem on the A380.Jump to post
So the tally for the year is 1 for Korean, 2 for Swiss and 1 for Air Tanzania? That is 4 out of 83 planes in service. That is a rate of about 1 in 20,000 flights. That is likely worse than the ETOPS requirement of 1 in 100,000 engine hours. I fail to see why the A220 was able to get ETOPS 180 appro...Jump to post
They just had the new FAA Administrator Scott Dickson on CNBC talking about the MAX. He is heading to Seattle this week to fly the fix in the SIM. In his own words "I will not let this plane return to service until it is the safest plane out there and I feel safe to put my own family on it&quo...Jump to post
A friend of mine once ate a lot of durian and drank lots of beer with it before a flight. This resulted in a small uproar in part of the cabin. He did not dare to confess that it was him.Jump to post
This isn't good. Boeing knew about MCAS risk before the crashes. NEW YORK: Even before the Lion Air and Ethiopian Airlines crashes claimed 346 lives, Boeing flight tests had revealed problems similar to those encountered by pilots on the ill-fated 737 MAX flights. Company officials learned that it...Jump to post
My analysis: Premium classes don't sell by price, they sell by product quality (within reasonable limits). For example my last employer had the policy that as long as intercontinental tickets costed less than 7000$ it was acceptable. F was not allowed. So the airlines do small improvements to the bu...Jump to post
$5.6b actually doesn't sound that bad. The article refers to USD5.6 plus a further USD 1.7 to be spread over future accounting periods. I am not challenging that it doesn't sound too bad, but just clarifying the actual cost announced. That's 7.2 billion in total. The A350 development cost was 12.38...Jump to post
Other than mail, how much cargo are US airlines going to move around the USA on NB jets? Compare that to the number of people flying domestically and you see why cargo is such a small part of it. And are they really going to effectively compete with fedex and ups? UPS and Fedex packages often trave...Jump to post
Is this a US thing? I have removed the first leg on both Norwegian and BA on a return ticket within Europe without problems. In the Norwegian case I just called and told them that I will not take the outgoing flight, so you can sell that seat to someone else. In the BA case the outgoing flight was d...Jump to post
The problem with electric jets is the propulsion itself. Propellers can pretty easily be powered with electric motors, but rushing air through a turbine at supersonic speeds (which you need in order to get to jet airliner speeds) is not very easily done. /Fredrik Most of the thrust on a commercial ...Jump to post
Reminds me of when I have payed for at seat but had to stand on a five hour trip because they changed to a smaller train for some reason. I got 50 kronor (~ 5 $) back because that was the price for the seat reservation. State monopoly for the win!Jump to post
Solar cells can be made very thin and light. So I think it will happen eventually. But the technology is not mature yet. MIT cell with a thickness of 1/50 of human hair, producing 6 W per gram (A quick calculation that might be wrong gave me that a jet engine produces about 20 W/g): https://newatlas...Jump to post
Small electric taxi service drones for short jumps. About 20 years away.Jump to post
Gas-wise. I just redid my US kitchen with Gagganeau modular cooktops. They have natural gas and propane options. I get natural gas piped to the house. My stove includes a wok burner that's 5/5kw/19,000 BTU. I'd like to see electric do something with that. There are induction hobs with that power. A...Jump to post
Yes, with 5 sensors, each of which has a 20% failure rate, the chance of any one of the sensors failing is 100%. That does not mean that you will get a failure every time, because sometimes you will get multiple failures and sometimes you will get zero failures. You get it wrong. Sorry. 100% probab...Jump to post
I read a story about an airliner that hit a fish in midair. Supposedly dropped by a bird.
https://www.nytimes.com/1987/04/01/us/f ... fault.html
I would just check the Voltage and Current requirements, if it wants AC or DC (most probably DC but check!) and connect my laboratory power supply to it. If something more portable is required just buy a power supply with similar ratings.Jump to post
Some quick calculations to add to the discussion (correct if totally wrong). Lets say a passenger and seat weighs 100 kg in average. That weight is on average 0.3 meters from the center line. plane has 30 rows. That gives an extra moment of: 0.3*100*30 = 900 kgm. An A220 has a wingspan of 35 meters....Jump to post
So how far does 1 hour of endurance get you? 1 hour endurance minus diversion, holding and final reserves equals zero endurance. Jet fuel powered aircraft are reaching towards 20 hours of range. However, don't forget that your batteries won't get much lighter towards the end of the flight, which is...Jump to post
Tesla 2170 battery has considerably higher energy density than you are claiming. At individual cell levels, specific energy density of li-ions is exceeding 250Wh per kg. However, you need to remember that cells need to be put in packs and then they need to be interconnected, sensors, fixtures, prot...Jump to post
A valveless pulsejet can have no moving parts. Is this really a first?
Autonomous systems connected to flight controls should of course not act on bad sensor data. How can you argue against that? But it can happen anyway. No design is perfect, so pilots should be prepared to handle such events. Turkish Airlines Flight 1951 crashed because of a bad sensor setting the en...Jump to post
The 737-9 is not selling because of the 737-10. So making a A320.5 seems like a bad idea.Jump to post
It's the same as BA and others. Some very long flights with just the middle seat blocked. I guess if it made sense they would but if people pay for it then there is no reason to change. It also gives a lot more flexibility as the business configuration can change to match demand on the route which ...Jump to post
Probably already installed if you run MacOS.
You will need to read a little to learn it but it is what many "pros" (and amateurs as me) use.
I don't buy the argument that the efficiency per seat is too bad. Why do carriers configure it in such a low density then? They can easily improve efficiency and still offer a superior comfort. An 11 abreast A380 is more comfortable than a 10 abreast 777 or 9 abreast 787. I think the A380 is simply ...Jump to post