Recent content by StandardsGuy

Most of the responses here are lacking explanations - mostly just arrogant gibberish. When a rocket (unpowered) slingshots off a planet by the pull of it's gravity, it leaves the vicinity of the planet with greater speed that when it approached. How did the rocket obtain higher speed if no force...

I have found squirrel-cage fans are quieter than box fans, but are generally bulkier. Some box fans are quieter than others, usually the ones with less blades. They may have specs for noise so that you can compare.

I've heard of cases where the builder didn't put in return ducts where they should have. You need a thermostat in the upper floors that determines when the AC unit runs, and you need one in the lower floors to determine when/if to open a duct to the lower floors. In the winter it will be...

As one who has had posts deleted, this is a strong put off. That's why I seldom get on this site. I think it would be better to reply to the person, "this did not contribute to the thread" rather than delete the post and the thumbs up that came with it.

How many times in the history of science has the current understanding been wrong, only to be changed by future discoveries? Take the Big Bang theory for instance. The recent JWST discoveries have challenged that.

Space without matter still has fields: electromagnetic field, gravitational field, Higgs field, etc. It also has energy, so "empty" space isn't nothing.

What kind of proof do have for that statement?

Alpha waves and other types of waves are involved with dreams and consciousness. There is much to be learned about the human brain. Here is a start: https://www.sciencedirect.com/topics/neuroscience/alpha-wave

I don't see any brush contacts. You haven't finished it yet.

Certainly I did. From the link in the OP: "Early VTOL experimental aircraft operated from open grids to channel away the engine exhaust and prevent thrust loss from HGI. The Bell X-14, built to research early VTOL technology, was unable to hover until suckdown effects were reduced by raising...

Why do you think ground effect is at work here? Rocket engines do not suck in their own exhaust.

If the antenna has no ground radials, then the ground on the end of the coax is an important part of the antenna. Otherwise it is only for lightning protection. A 10' piece of chain-link fence pipe is cheaper than an 8' copper rod, and will make a better ground. A hammer-drill will work well for...

The diode serves no useful purpose and looks to be in backwards, but no polarity of voltage is shown. There is little current limiting in the circuit, so the transistor may fail from excess current, except that the transistor has no bias. The inductor is a very poor antenna. How does it work...

How would you know that you are at rest when you make this measurement, or does it matter?

Unknown. I take it the signal has not been re-observed. https://www.msn.com/en-us/news/technology/alien-hunters-detect-mysterious-radio-signal-from-nearby-star/ar-BB1c3rJU