Not to disparage the brilliant if unromantic folks at Langley, but the ones who actually built the things were at private companies like Boeing who repurposed a secret earth surveillance wet film camera + kinescope to work for the moon. They got no naming rights & not much glory. Lotsa fun tho!

The Ranger crater looks pretty symmetrical so not a shallow angle impact. Not surprising since it didn't orbit but just went straight in.I don't know how they de-orbited the LOs.

Does anybody know what a Lunar Orbiter or Ranger crash site would look like? Size/shape of crater? Would anything of the spacecraft remain? @inverting-vision.bsky.social?

Nice sleuthing! Hard to believe how bad TV was then. Gonna be so much better quality this time around.

Increase(d) *urine* volume?

I agree. I got very good log-linear results with a ratio of room size/CADR about 6x smaller than in this paper by using intervals of 6 seconds vs their 60 seconds. Typically 20 points of so. And I can measure wall deposition just before turning on the purifier.
bsky.app/profile/dtag...

Or the other way around. Unless, of course, a used spleen would actually fix the wiring. 🤣

I'm all for it. I post rarely, but I post on 🦋 first, then on X. If love to see the IAQ crowd all on 🦋.

Well, I saw it and I have a morbid fear of catching meals. 😀

Yeah. I was just bein' testy. 🥴

Sadly, this post proves no information at all. The ALT text is not live in the image and no source is given. A tiny 2" fan with a tiny HEPA filter meets the definition here, but would have no measurable effect on the aerosol in a room.

Investment casting (list wax) is used for jet engine turbine blades. I've used it for jewelry.

I agree, and it's a big pain, but Xitter is unlikely to reform and could decide any time to algo against fans or clean air or science. I keep on here because it can be fixed and it can grow.

"So a PASSPORT, or a Real ID, are required to fly. We'll just refer to this as a PASSPORT, because we're confident that you know what we mean and it's easier for us."

OK; I'm stupid. Please explain how I should interpret the circled items. Or are they just red-circled herrings?

Thanks for your reply, but Chrome link just goes to DLs I've done on my phone from Chrome. The ResearchGate link offers View (abridged version) or Download gives a message that it's unable to DL and suggests checking net connection. But that's OK at 150mbs. Could you send me a copy?

Where did this paper come from? No journal, no identification of author's affiliation, no data, no tables, no figures. Just assertions.

It's endorsed by a company that sells only HEPAs (good ones, but only HEPAs). Just use a generic term like high-CADR air purifier.
Also, noise is not considered in the calculation, but it's critical for user acceptance.

This calculator unnecessarily limits air purifiers to HEPA units, often not the most cost-effective kind. Air purifier = HEPA is like beverage = red wine, so eat only dishes that go with red wine. The calculator uses CADR, the right measure but applies to PC-fan-furnace-filter purifiers as well.

Good. Thanks. I sometimes go to technical seminars in classrooms at a local college and never see masks, purifiers, or UVC. When I asked about CADR in one of their auditoriums, I got the usual "We meet all requirements..." Which tells me they didn't know the CADR and didn't care.

I didn't see any masks. How is the air quality in a room like that?

📌

Agreed. But I'll still push for "high CADR", or perhaps "high-CADR/HEPA" since I expect that if air purifiers do become widely adopted, they won't be HEPA, and using only the HEPA term may delay that day.

I am glad to see you were not intentionally blocked. I agree with your statement, except I think a better term than HEPA is "high CADR", since CADR is a metric while HEPA is only a standard for single-pass efficiency.

📌

Yes. Accent on ADDITIVE air cleaners.

🧚🏽‍♀️👍🏽🩷🥰🙏🏽

Cooler because it's paint, not because it's black, right?

OK, knots. 😄

And less effect with high-wing than low-wing. Would depend a lot on on runway length and width. But right next to the conveyer it's a 60mph headwind.