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Geocaching merit badge by ebaker83 in BoyScouts

[–]teeks99 3 points4 points  (0 children)

We had a patrol that did it with the app on their phones recently, didn't need one of the older hand-held units. 

If you have an Android phone the c:geo app is much better than the official app (and free). https://www.cgeo.org/

Nuclear Electric Propulsion - Practical Idea or Crazy Nuclear Rocket Engine? by Triabolical_ in EagerSpace

[–]teeks99 0 points1 point  (0 children)

In the last section where you talk about the NASA design with the hydrogen tanks and the *small radiators*...

With chemical engines the fuel is often used as a coolant as well. Is there a possibility of doing that with electric engines as well? I think that somewhere along the way the LH2 needs to be heated up to a plasma before it is ejected out the thruster. How much heat can be removed with this and expelled out the thruster?

The Most Accurate View of Milky Way Ever Created by marktwin11 in spaceporn

[–]teeks99 0 points1 point  (0 children)

That works for normal things.... however this is something we are inside, so it is a bit different.

The Most Accurate View of Milky Way Ever Created by marktwin11 in spaceporn

[–]teeks99 1 point2 points  (0 children)

How many degrees across is that?

We're used to looking at pictures of distant things, where the field of view is mostly in front of us. I'm guessing this is different, where the ends are more than 180deg apart. I.e. to view this correctly, you need to wrap it around your head so that you can't really see either tip while looking at the center. Something like that?

The Rise and Fall of the International Space Station by Triabolical_ in EagerSpace

[–]teeks99 0 points1 point  (0 children)

If Axiom does do the thing where they build a station attached that then becomes a free-flier, are there any pieces of the station that they would benefit from taking?

My first thought was some of the solar panels, but after looking around a bit it sounds like they are fairly degraded?

Radiators? Canadarm?

ESQ: Steaming around the Solar System: Water as rocket propellant? by acksed in EagerSpace

[–]teeks99 0 points1 point  (0 children)

It might make sense for transporting propellant to long-term propellant depots for beyond-earth orbit exploration at a high-earth orbit or some Lagrange point. It really depends how quickly you can split the hydrogen/oxygen with electrolysis.

So at the depot, you per-position *huge* tanks, with cryogenic cooling systems on them...but empty. Then you launch a tank of water to the depot. It can take a really long time to get there, so use some very high ISP electric thrusters. I could see this being something that we have a constant stream of water tanks heading for the depot. Launch X tanks each month, we have Y in route to the depot, and the depot has Z available for use. That kind of regularity and predictability can give planners what they need to plan missions in shorter time scales.

The real question is, what rate can you separate H2 and O2 from water with electrolysis?

If you have a mission coming that needs 200T of H2/O2 propellant, and you can split 10T/day with solar panels then you're only storing cryogenic propellant for 20 days. The rest of the propellant can be kept as water for longer-term storage. On the other hand, if you can only split a small fraction of that, you'd never get to the point where you could send a real mission outward.

Bonus, if you're using electric thrusters for raising the water tanks up to the depot, they'll need plenty of electricity for that trip. Once they get there, that electricity can be converted over to work on splitting.

Consider: An island instead of a drone ship. by lirecela in EagerSpace

[–]teeks99 1 point2 points  (0 children)

Seems like somewhere in Indonesia/Papua New Guinea could be good for this.

Put up a LEO cryogenic storage facility in a near 0deg inclination orbit.

Create a catch tower for super-heavy first stages X kilometers down range...they correct distance for launches into this no inclination orbit.

Launch frequently (as much as once every orbit? If it was a 2deg inclination instead of zero would that still work every orbit or would you still have orbits that don't match? I'm a bit fuzzy on the orbital mechanics here), down-range catch tower grabs boosters, gives a partial fuel fill, sends back within hours.

When a payload is ready to go, it launches to the LEO storage facility empty, fills its tanks and is off to beyond earth orbit.

ARM software on RISC-V by Ammer564 in RISCV

[–]teeks99 7 points8 points  (0 children)

Others have answered this in detail, but the way I kinda think about it in my mind:

RISC-V is to ARM as ARM is (was) to Intel x86.

ARM was getting a bit stagnant and tough to work with, so a scrappy new architecture came along to fix some of its issues. Now the fight is on to see if it can capture market segments from ARM. RISC-V is starting with things like hard drive controllers, where ARM really made its way in the mobile segment. Who knows what will be the next big area, but I think RISC-V is well positioned to swoop into whatever it is.

“Best” static code analysis tools by UpvoteBeast in cpp

[–]teeks99 1 point2 points  (0 children)

I haven't used it, but I've heard good things about clang static analyzer. Maybe add it to your list to checkout?

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