Viewing profile — asdfadsfgfdda

On a typical day, the atmospheric pressure varies by maybe 150 Pa, or 3 psf. By definition, that’s 137 dB. But it’s imperceptible because the rate of change is so low.

It’s not accurate to convert .1 psf to dB because it’s an impulsive shape, not a continuous tone. And human loudness perception depends on how smooth (low frequency) the shape is

One slight advantage: you can store liquid nitrogen. So, you can use cheaper electricity to produce it

The engine load is probably a steady, consistent magnitude. While a landing load is rapid and variable. Also, you need to design legs for wind loading after landing, which can be h…

or its shiny because vacuum hardware is routinely electropolished?

I think the original plan was to convert the heat back into electricity with a turbine. So the higher temperature of sand would greatly improve thermodynamic efficiency.

Yes a storm could damage the coal plant with some small probability. But now you have replaced the coal plant with batteries + solar. Solar will be disabled by every large storm du…

Pilots still fight turbulence today, usually by changing altitude. If this system allows the plane to stay at optimal (but turbulent) altitude, it could save fuel.

Stainless steel has its own safety issues (hexavalent chromium exposure from welding or grinding)

Private car insurance companies are pretty sophisticated, so they certainly know if a certain vehicle is causing higher claims and will price accordingly. But, IMHO, the legal mini…

It's not just a passive payload, these targets have radio transmitters. So the task is probably easier.

Quad-engine jets are automatically ETOPS-180 https://www.boeing.com/commercial/aeromagazine/articles/qtr_...

In theory, a faster airplane is more productive (fly passengers farther in the same amount of time). So crew and capex costs are lower per mile. Maybe a crew can fly New York-Londo…

There are many in CA that are ridiculous. Most are not related to safety, but likely due to lobbying from some industry. Fire sprinklers are required in single family homes. The ve…

>The mobile microreactor would be coupled with a power conversion system that generates approximately 1 to 5 MWe using an open Brayton gas cycle https://www.cto.mil/wp-content/uplo…

These are gas-cooled reactors, and much lower power output. Existing designs for Navy reactors are all pressurized water reactors that produce hundreds of MW. There's also a challe…

Most fuel for aviation is jet fuel, and there already is a "drop in" approved biofuel available: https://www.faa.gov/about/office_org/headquarters_offices/an...

The real answer is: look at their workforce. Their workforce has all the power in negotiating. https://philip.greenspun.com/flying/unions-and-airlines

Depends on the customer. An occasional (1/year) flyer? Probably not. A frequent flyer? Yes, by direct observation and indirect anecdotes. There are also very sophisticated customer…

It's a glider, but a glider capable of mach 3 flight. So, approach speeds will be much faster than a typical glider. Probably higher speed than an airliner. That would be dangerous…

The linde cycle is not used industrially, they are using a reverse brayton cycle. This cycle use air as the refrigerant, and is probably the most widely distributed industrial cycl…

They likely use air as the refrigerant, like most air liquefaction plants.

I doubt $.50 is the true cost, there's a program to donate millions of tablets to developing countries: https://mectizan.org/partners/glaxosmithkline/

>If people do not truly know how protective a vaccine is, there is the potential for harm because they may assume that they are fully protected when they are not, and accordingly, …

They do publish evidence. Seems to increase the "closure" rate by 5-10%. It's not perfect data, because they are only flying during the day, so crime committed at night may just be…