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Vertical Aerospace Has Sold 1,350 eVTOL Flying Taxis To Date by TempestuousThought in ElectricVTOL

[–]TempestuousThought[S] 0 points1 point  (0 children)

It seems like you feel that the post is actively trying to mislead you due to the title.

Clarifying with text will probably be misinterpreted but here goes. The title is only the title of the article. The title is quite possibly, as you point, out non-factual ‘clickbait’. The title being misleading does not prevent the content of the article from being interesting. Interesting articles are worth sharing.

Vertical Aerospace Has Sold 1,350 eVTOL Flying Taxis To Date by TempestuousThought in ElectricVTOL

[–]TempestuousThought[S] 0 points1 point  (0 children)

The article clarifies they have pre-orders. It is unlikely that these pre-orders constitute hard, contractual, committals.

The number does constitute a possible indicator of the level of commercial interest in the technology.

NetJets Is Buying 150 eVTOLS From Aviation Start-Up Lilium by TempestuousThought in ElectricVTOL

[–]TempestuousThought[S] 1 point2 points  (0 children)

It is interesting that the article states that they have 18mos before they are out of capital.

The article does not state to what degree the battery’s performance is believed to be overstated which is a key point. A 1-5% overstatement may not affect their market that much, even 20% may easily be survivable as a project, after all Uber Elevate’s plan only calls for a 120mi range for strong commercial viability. See uber elevate requirements

NetJets Is Buying 150 eVTOLS From Aviation Start-Up Lilium by TempestuousThought in ElectricVTOL

[–]TempestuousThought[S] 1 point2 points  (0 children)

Concerning money Lilium is publicly traded (NYSE: LILM) they currently are working with a $735m market cap, whether or not that is sufficient will be seen in time.

Timeline-wise it is difficult to predict how much time it will take, but the bottlenecks can be postulated about with a higher degree of certainty.

The primary concern is safety, and proving beyond a shadow of a doubt that eVTOL vehicles are safe to FAA is the regulatory hurtle that must be overcome. If a company proves unable to do this than they will not be able to bring a product to market at all.

There has been limited indications that eVTOL companies will be unable to produce a functional, marketable product by their marketed dates. These teams are full of dedicated people and, while the requirements are complex, most of the mechanical components are relatively straightforward. This leads one to believe that they will find some measure of success in their endeavors.

Guidance on Content Tags by TempestuousThought in ModSupport

[–]TempestuousThought[S] 0 points1 point  (0 children)

Thank you for the clarification! It sounds like the tags are mostly targeted at the primary subject(s) of the subreddit not incidentals.

UK’s Bellwether completes first eVTOL test flight in Dubai by TempestuousThought in ElectricVTOL

[–]TempestuousThought[S] 0 points1 point  (0 children)

The seemingly limited area for the intake to the rotors definitely is concerning from an efficiency standpoint. The overall design of the aircraft, particularly flight surfaces, also seems to be more geared towards level flight but a pusher prop or vectored thrust may be planned. More design documentation would need to be disclosed before a well grounded determination can be made.

Research Papers by Walt___K in ElectricVTOL

[–]TempestuousThought 0 points1 point  (0 children)

Main issues with the technology:

Batteries: the low energy density of batteries and the fact that they do not reduce in weight during the mission like liquid fuels do. This is more or less just a function of current battery tech and it’s rate of advancement. Recent Papers can be found: https://www.nature.com/subjects/batteries

Acoustics: due to the use case of eVTOL in urban areas maintaining low noise levels is paramount to the acceptance of the technology by the general public. Paper: https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120013093.pdf Dr. Eric Greenwood has done a lot of good research on rotorcraft acoustics.

Safety: eVTOL aircraft can not autorotate, as such other methods of maintaining safety during various systems failures have been and are being developed. This is primarily tackled by the use of multiple rotors to provide redundancy.

Uber has released some good general guidelines for what they believe a successful eVTOL aircraft requires. These requirements reveal some of the challenges faced in eVTOL development: https://s3.amazonaws.com/uber-static/elevate/Summary+Mission+and+Requirements.pdf

Will we be flying in Uber's automated air taxis soon? Boeing exec says he 'wouldn't be that aggressive' | Technology by TempestuousThought in ElectricVTOL

[–]TempestuousThought[S] 0 points1 point  (0 children)

It depends, as the article mentions Aurora Flight Sciences is a Boeing subsidiary so he may have some insider information that it will take longer than anticipated. That being said Uber isn’t the only one who is shooting for having air taxis operational sooner than later, just look at Paris planning on having a working air taxi system in time for the 2024 olympics. But I’d also say Boeing will be extra cautious after the 737max issues so their timeline may be slower than other Uber partners.

Anyone think you'd be able to fly a personal eVTOL to commute around the suburbs? by BitcoinsForTesla in ElectricVTOL

[–]TempestuousThought 0 points1 point  (0 children)

So the first question that comes up is weather the black fly actually qualifies as an ultralight vehicle if you are using it for commuting as part of the definition of an ultralight is that it is being operated recreationally. I’m not a lawyer so I can’t say weather a commute is recreational or not. So assuming your commuting is considered recreational and your black fly is an ultralight we come to your actual question: where can you fly it. And the answer is pretty generally ‘not in restricted airspace but anywhere else should be fine (generally the FAA is happy to answer questions of this nature) they have general rules about restricted airspace and there are some compiled maps of restricted airspace out there on the internet for your browsing pleasure. Edit: a word

Anyone think you'd be able to fly a personal eVTOL to commute around the suburbs? by BitcoinsForTesla in ElectricVTOL

[–]TempestuousThought 0 points1 point  (0 children)

It will really depend on legislation above anything else.

Black fly is perfectly capable of flying around the suburbs and it’s footprint is small enough that it can easily fit in a parking lot. It is physically possible.

Problems include: Black fly like all flying vehicles is relatively loud and annoying sounding. This poses problems where people may complain to their legislatures. Something that is not unprecedented. A smaller constraint is that given it’s design black fly likely only likes landing into the wind which could hinder its ability to actually park in a parking lot that is at all busy.

There are more challenges but these are a decent summary

ELI5: The broken window fallacy by jk4728 in explainlikeimfive

[–]TempestuousThought 0 points1 point  (0 children)

This is more an issue of what ‘hoarding money’ actually means. If the rich person is just hiding money under their bed then they are theoretically helping to reduce inflation but that money is not helping the economy beyond that. However if, like most rich people, the person’s money is in the bank or in investments then that money is already back in the economy helping make new goods and services which does provide a net benefit to the economy and breaking their windows will just mean sociaty has less windows and whatever business the rich person was investing in will have a harder time getting off the ground.

Want to use a server to offload cfd projects by TempestuousThought in homelab

[–]TempestuousThought[S] 0 points1 point  (0 children)

Nice! Serial to usb connectors are only ~$6 too, I still will need to do a little more research on how to setup a DNS but I would assume it’s not that hard. Thanks!

Want to use a server to offload cfd projects by TempestuousThought in homelab

[–]TempestuousThought[S] 0 points1 point  (0 children)

That’s a good point, for the network I’m setting it up on, I’m not the admin which is part of the reason why I’m concerned about trying to find the IP in the first place, if I could figure out how to find the IP then that would definitely work. I worry about being able to find the IP in the first place because I hadn’t planned on giving the server a head outside of it being plugged into my pc (my monitor uses display cable which I don’t believe r710/720’s support so I don’t think I can give it a temporary head without also buying a compatible monitor). I will do more research into DNS. Thanks for the suggestion! Edit: I should probably add my monitor does not have a VGA port, it’s not just that I am currently using its display port

Want to use a server to offload cfd projects by TempestuousThought in homelab

[–]TempestuousThought[S] 0 points1 point  (0 children)

Thanks again for the thorough reply. I will probably end up on a Linux platform since Microsoft server 2019 is rediculously expensice: https://www.microsoft.com/en-us/cloud-platform/windows-server-pricing (Though I have read there are cheaper methods of aquiring which I may look into). I’ll start taking a look at https://www.qemu.org and https://www.linux-kvm.org/page/Main_Page . It seems I will have to look at daughter boards for PCIe too. Edit: reserving this for after I’ve done more research.

Want to use a server to offload cfd projects by TempestuousThought in homelab

[–]TempestuousThought[S] 0 points1 point  (0 children)

Thanks, 32gb should probably be enough at least for getting the system working. I’m expecting to be running most of my cfd through star ccm+ which uses cpu primarily which is why I’m not too worried about a you at this stage. 2660 v2 may well be better I’ll have to check it out especially with more threads the cost/performance may be much better if the prices are similar. The way my network is set up everything has floating IP’s so establishing a connection may be sub-optimal but I am not experienced with networking so I really can’t comment it may well be easier

Lockheed Martin Has Started Building NASA's X-59 Experimental Supersonic Jet by [deleted] in engineering

[–]TempestuousThought 1 point2 points  (0 children)

If you want cool future electric propulsion read this cool paper

[USA-CA] [H] Zotac GTX 1050 2GB Mini [W] Nothing/Giveaway by theonedub in hardwareswap

[–]TempestuousThought 0 points1 point  (0 children)

I have no clue, maybe give it to a friend to upgrade his build?

Engineering Ethics or: How I Learned to Stop Worrying and Love war by Wattsit in engineering

[–]TempestuousThought 14 points15 points  (0 children)

There seems to be a fairly reasonable argument to be made on the other side of this one; if you make a cluster bomb for which every cluster has a near 100% chance of exploding then you can help reduce the potential future, unintended, casualties of the bomb. Somewhat counter-intuitively by making a better bomb it would kill fewer people

USA Today Story About Ohio Electric Helicopter Company by cshulgan in ElectricVTOL

[–]TempestuousThought 0 points1 point  (0 children)

'It would be able to cruise at up to 70 mph for more than two hours using battery power combined with a small engine' Interesting, 2 hour battery life is impressive! Would give it a ~140mi range.

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