FlyMoreRockets

Thanks, I had no idea lead-bismuth reactors existed. It seems the large number of unstable lead isotopes and their long decay chain would assure a long cooldown requirement before any maintenance could be done in the reactor compartment/primary coolant system. Not only that, but this stuff would present a huge disposal problem. https://en.wikipedia.org/wiki/Isotopes_of_lead

It seems the Alfa class was decommissioned for scrapping, though one was refitted with a pressurized water reactor for a while. https://en.wikipedia.org/wiki/Alfa-class_submarine#Decommiss...

An interesting issue with this design is that if the Pb-Bi coolant ever solidified, the reactor control rods became frozen in place.

It may just be easier to design a zero G litter box. A screen bottom with a coarse granular material and sufficient airflow through the bed could work. No idea how a cat would dig in zero G though.

I have a couple of EM tables,one from 1956,the other from 1966. Schematics used to be freely available untill somebody scooped up the copyrights and issued takedown notices so they could change a premium.

Maybe this tool will help me get them back up..

It has been one before. https://en.wikipedia.org/wiki/Rozi%C3%A8re_balloon

I've often wondered if a double envelope would be worthwhile. Use a thin outer envelope containing He, and an inner lifting envelope with H. The outer envelope would contain any H that leaked through the inner membrane.

As noted, the lower explosive limit for hydrogen in air is 4%. Significantly lower with pure oxygen. https://www.safeopedia.com/definition/2205/explosive-flammab...

The problem is that hydrogen is a very small molecule and readily escapes containment. It can even travel along grain boundaries through solid metal.

A British film documenting theory and operation of the V2 rocket.

Strength to weight ratio and high temperature properties.

More interesting than copper as used in the example would be nickel or rhodium.

An easy path to metal matrix composites.

Every single component in every single aircraft certificated in the USA is tracked all the way to the mine. A quick web search reveals around 11.3 million people work in the aviation industry directly. A significant portion of this would have to be duplicated if the FAA were to verify everything.

This looks like a very useful reference on the subject. Thanks!

This is a wonderful resource, looking forward to exploring.

This seems like a fairly inexpensive way to get into LinuxCNC.

Yeah, you're right. Wikipedia lists the most popular channels, and they're pretty much just entertainment and music. Then again, as near as I can tell, that's exactly what they are. Even the one listed as education is just music/entertainment for children.

https://en.wikipedia.org/wiki/List_of_most-subscribed_YouTub...

It's generally pretty easy to spot the fakes if you have a basic understanding of the field and are just researching for specific details. Frankly, for the stuff I typically look for, there are surprisingly few fakes to be found. This may change with YT deprecating the down-vote arrow.

Tetris is another great example of how competitors are using YouTube to rapidly progress in skill.

https://www.newyorker.com/culture/cultural-comment/the-revol...

The FAA grew out of the Air Commerce Act of 1926 to ensure commercial development of aviation.

https://en.wikipedia.org/wiki/United_States_government_role_...

Flying lawn mowers have existed for decades: https://www.youtube.com/watch?v=kNWfqVWC2KI