🌪From the weekend, this is one of the most violent tornado videos I think I’ve ever seen🌪

This was from a tornado outbreak in, of all places, the Czech Republic

The way those trees topple over is unbelievable. That is some incredible wind speed
From a bit further away, this gives you some perspective on the strength of this storm and the level of danger present in the first video

This is the scene afterwards, it looks like a bomb went off. Really bad situation

Here’s some aerial footage of the damage via @BrnoNewsCTV

The tornado apparently left a damage track 26 km long that ranged from 100 to 700 meters wide

We have a relatively high frequency of tornadoes in the US, but they do happen all over the world

I saw a lot of comments remarking how unsafe it was to take that video (true! don’t do that!) but for an area where tornadoes are rare I think we need to cut them some slack Image
Also consider that even in the US where tornado safety is a regular point of emphasis, there are many myths people believe (parking under overpasses!) and still plenty of folks taking dangerous videos close to windows

weather.gov/mkx/taw-tornad…
If you would like to help, @BrnoNewsCTV seems to be a pretty good source of local information.

Thankfully it sounds like there has been an outpouring of support for the affected area (to the point where traffic has been an issue)
And this appears to be the original source of the video (slightly longer version as well)—notice how many trees are there at the start

facebook.com/juwa1704/posts…
Another way to help via @EVlnata

There are a lot of people out there trying to help out and it’s great to see
gofundme.com/f/help-tsjechi…

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More from @DrChrisCombs

Feb 5
Take that CFD nerds Image
From the Anderson hypersonics book Image
Read 4 tweets
Dec 14, 2023
So, if I understand correctly, it sounds like GE has successfully tested a turbine-based combined-cycle engine that incorporates: 1) gas turbine; 2) rotating detonation engine; 3) ramjet; 4) scramjet 🤯

Could in theory go from 0 to Mach 10+

Demo at full scale planned for 2024 Image
GE press release:

Some earlier reporting on the concept: geaerospace.com/press-release/…
aviationweek.com/shownews/paris…
Here's my explainer thread on turbine-based combined-cycle (TBCC) engines
Read 7 tweets
Nov 11, 2023
As we approach what may be a historic Starship flight test, this Reuters report is really, really bad

No excuses: as arguably the number one launch provider *in the world* the safety culture at SpaceX has to be better. They should be setting the standard (in a good way)

If we are going to continue giving them billions annually in taxpayer dollars, they can’t keep treating workers like disposable meat puppets


Image
And yes before you ask these numbers are much worse than industry averages Image
This is an absolutely total systematic failure that goes beyond SpaceX—NASA has some explaining to do about how they allowed SpaceX to operate in their own backyard allowing a > 20% injury rate Image
Read 4 tweets
Jul 10, 2023
If you're ever frustrated by someone with a PhD acting like a know-it-all outside their niche field of study, just remember that Albert Einstein tried to design an airfoil but it performed so poorly during testing it's flight characteristics were compared to a "pregnant duck"
HT to @milan_tomicc for reminding me of this the other day
For a bit more technical insight, bottom line is that Einstein designed this entirely using Bernoulli theory.

Stall at 12deg AoA @ 92 L/D

He later confessed he was "ashamed" and "this is what can happen to a man that thinks a lot but reads little"

Read 4 tweets
Apr 21, 2023
Am I being unreasonable in thinking that "clearing the launch pad" (that everyone knew would be destroyed) is a bit of a low bar for arguably the most successful launch company *ever*?

Sorry for having higher expectations for SpaceX?

The whole thing feels half-baked and rushed
I really want SpaceX to do well

We NEED SpaceX to do well

SpaceX has a great track record of success

There are tons of insanely smart, hard-working, talented people there

NASA needs Starship to put boots on the moon

So I expect more than what we got yesterday
When some brand new startup or a university rocket club sends their rocket into a death spiral at T+4min we all pat them on the back and say "space is hard" and "you'll figure it out"

I hold SpaceX (and NASA) to a much higher standard. SpaceX is better than this. It wasn't ready
Read 5 tweets
Mar 11, 2023
WE DID IT!!!

MOO-K SEVEN

HEIFERSONIC
I HAVE NO IDEA WHAT WE LEARNED BUT I'M EXCITED
Some quick notes about this images: first, this is from a technique called schlieren imaging and what you are seeing are density gradients in the flow. helps to visualize shock waves, expansion fans, etc.
Read 6 tweets

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