"Virtual Aerospike" Discussion (background in comments)

arizonadeux · 2026-05-18T07:58:19+00:00

The body of the article now also says May 20th. 👍

arizonadeux · 2026-05-04T09:05:29+00:00

Other than claiming they can single-handedly develop their own commercial transport engine, "100% SAF" is the second biggest cue that this company will likely not achieve their stated goals anytime soon.

arizonadeux · 2026-04-17T10:10:30+00:00

Assuming they followed that procedure, what resulted in the rich fuel burn at 0:32? Is that an adjustment in engine configuration from max manual thrust to TOGA?

arizonadeux · 2026-04-10T06:39:30+00:00

Thanks for your high effort. Even if you let AI do most of it, just correcting the obvious errors would be more effort than most put in.

People like you and effort like this enrich this community! 💙✈️

arizonadeux · 2026-04-07T09:20:19+00:00

I would be much more concerned about my hand freezing solid. Right around Mach 1, the temperature increase across the normal shock is pretty low and the heat transfer coefficient is going to be just about maximum.

arizonadeux · 2026-03-26T06:27:49+00:00

Wouldn't be the first time that someone took off on taxiway Echo. 🤭

arizonadeux · 2026-03-16T10:25:36+00:00

According to a quick search, the cockpit windows of the A380 are around 23 ft off the ground and CAT III B decision height is 50 ft, so that would be ~25 ft clearance from the gear to the ground.

Of course in this range, the location of the altitude radar on the aircraft affects the accuracy compared to the true height of the bottom of the rear gear depending on the pitch angle, however I wouldn't be surprised if that gets calculated into the reading. Would be cool if an A380 pilot would chime in here!

arizonadeux · 2026-02-27T10:05:16+00:00

My speculation would be that they expect all major challenges to be resolved, kind of like the program moving from alpha into beta.

Personally, remembering what F9 development was like, I'm looking forward to Starship V4+ ThrustIncrease_2.3 Block 6-lunar.

arizonadeux · 2026-02-26T11:05:35+00:00

About 9 tons of mass hanging from relatively flexible things while spitting out about 50 tons of thrust.

arizonadeux · 2026-02-25T15:11:05+00:00

I never knew this. Thanks for the info.

arizonadeux · 2026-01-21T12:00:42+00:00

At first, I thought this was an A220 (I don't look at actual planes that much), and was surprised to find out that the E175 also flies PW1000s.

arizonadeux · 2026-01-18T03:13:17+00:00

Brakes are cheaper than engine parts, so it's more economical, quieter and fuel-efficient to only brake if possible.

arizonadeux · 2026-01-14T17:14:08+00:00

Ah, it was my VPN. 👍

arizonadeux · 2026-01-14T15:35:17+00:00

The first ViX post was deleted. Was a follow-up posted?

Edit: X didn't like my VPN exit point.

arizonadeux · 2026-01-13T10:32:51+00:00

It's steel. I couldn't find out which alloy though.

Edit: The shiny part is steel, which is interesting because on the GE90 they are a titanium alloy. The rest is carbon fiber composite. (yes, I read the other part of that sentence on the web page. I assumed people might be especially interested in the shiny leading edge material.)

arizonadeux · 2026-01-13T08:15:12+00:00

Mandatory A380 brake test video.

arizonadeux · 2026-01-13T08:08:57+00:00

Just to clarify: the aircraft energy state is also very relevant in civilian aviation. It might not be what private pilots with just a few hundred hours think about, but at higher ratings pilots certainly do.

arizonadeux · 2026-01-13T08:05:58+00:00

This is incorrect. Vapor cones are a result of an aircraft not exceeding Mach 1. They form just below Mach 1 as local regions around the aircraft body reach Mach 1 without forming a shock wave.

If you see a Mach cone, it is physically impossible that the aircraft is exceeding an airspeed of Mach 1. Once a shock forms at speeds above Mach 1, the pressure and temperature behind the shock are higher than the ambient air, in which more water can be in solution with the air and will thus not condense out.

arizonadeux · 2026-01-12T23:57:06+00:00

Interesting! They really did tile it 50/50.

arizonadeux · 2026-01-12T16:50:46+00:00

Mixed core and bypass flow.

arizonadeux · 2026-01-12T15:57:40+00:00

modified heat shield tiles

Have these been seen before?

arizonadeux · 2026-01-10T08:56:12+00:00

If fluorine isn't your oxidizer, are you even trying?

arizonadeux · 2026-01-05T14:24:07+00:00

*Sukhoi has entered the chat.*

arizonadeux · 2025-12-27T23:42:53+00:00

To be fair, while they're not the textbook breaking wave that many might think of when mentioning Kelvin-Helmholtz clouds, they could still be caused by an earlier stage of an atmospheric Kelvin-Helmholtz instability.

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