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Just played around a bit and found something neat (imho). WinMerge can diff .ork files without any workarounds. Enable the option "Detect archive type from file signature" and it works. With Git, this approach works too, but only locally and not on Github. Reinhard

A rocket that reaches 100km+ will be passing the 80km mark at 626m/s+. That's above the current limits for export controlled GNSS receivers of 600m/s (see the USML: 22 CFR part 121, Category XII (d)(2)(iv), which I guess is the US implementation of MTCR Annex 11.A.3.b.1.). Most GNSS receivers...

If you keep posting xkcd, don't forget to include the mouse over alt-text. Otherwise you often miss half of the fun. Reinhard

Two notes: 1. Boeing now advises the airlines to check the switch if it is properly mounted. Apparently, there is the possibility of activating the switch by pressing down the cover if the switch is loose. 2. Juan Browne (Blancolirio), a B777 pilot, on his Youtube channel explains how a slow...

Of course it's an orange that got into trouble. I guess his meowyer will mount a successful insanity defense though, given the precedents. Reinhard

Google still finds the manual hidden on the Byonics website (search for: "MicroTrak AIO-B") https://www.byonics.com/downloads/MicroTrak-AIO-B_V1_Manual_v0.2.pdf The Internet Archive Wayback Machine is also helpful: https://web.archive.org/web/20180424022122/http://www.byonics.com/aio From a...

The two smaller guns above are AK-630M CIWS, the Russian equivalent of the Phalanx CIWS. It's minimum elevation is -12°, so it can also engage surface targets. In theory, this system should make short work of the comparably slow drones. However, even the heavier armed Moskva (6 AK-630M systems...

Besides the safety aspect, there is another reason for using gloves when using epoxy. For a high quality bond, you don't want to get getting skin oils onto the workpiece. Gloves help with that too. Reinhard

Ground test a small, freshly cut sliver, without a motor. Use a small-ish igniter, for example an e-match or Estes igniter. If it readily ignites with an e-match, it's a good propellant to augment igniters (examples are AT Blue Thunder and CTI White Thunder). If it doesn't ignite, it's not a...

Apparently condenser is the historical term and was intentionally replaced to avoid confusion with steam condensers, starting in the 1920s in the UK. The German term is still "Kondensator" for both the electronic component as well as (steam) condensers. Reinhard

Ni-63 is made in the US by enriching Ni-62 (natural abundance 3.6%) with electromagnetic separators (expensive, but very selective regarding unwanted isotopes) followed by transmuting it via neutron capture in a reactor. Even in a specialized reactor, optimized for high neutron flux, that still...

As Henry Ford was claimed (dubiously) to have said: I guess the same is true for "better performing BP". If more performance is desired, APCP, NC, HMX, BKNO3 or whatnot will do a much better job than the finest imaginable BP, and if performance is not critical, the well known BP still works...

I had similar thoughts in 2021, when the MAX returned to flight. Apparently, I was wrong then and now I have no idea what to expect from the foreseeable future. I guess at least in the long run, Boeing will get it's act together again but part of me wonders if this was already the last skeleton...

For igniters, you want something that measures reasonably fast. E-matches fire on a time scale of milliseconds. Anything that looks like a multimeter is very unlikely to be able to resolve what's going there. Other igniter types (e.g. various "motor starters") may be slower, but with a slow...

Speed tape is a thing on planes and has a similar appearance to duct tape. Of course it will be applied cleaner than in the above photoshop and without interfering with control surfaces etc. Reinhard

Sounds like a "Gradatim Ferociter" approach... The launch pad thing was at least partially motivated by the fact that there are no flame trenches at Mars. If it would have worked better, it would have been a valuable lesson. There are other considerations, like the time to finish the deluge...

The rocketry community in Austria is not very big, but it does exist. And it's currently not threatened by drop bears. :) There are 3 student rocket teams (2 in Vienna, 1 in Graz) and a relatively new Tripoli prefecture. Launching in Austria is a bit inconvenient if you need a waiver (above...

For rockets, the specific impulse (Isp) is basically the exhaust velocity. It is often expressed in seconds. You get that by dividing the effective exhaust velocity by Earths standard gravity. https://en.wikipedia.org/wiki/Specific_impulse#Specific_impulse_in_seconds The theoretical Isp of at...

An exhaust velocity of 4,875 mph is equivalent to an Isp of 222s. That's not BP. Reinhard

I'll just leave this here: Reinhard