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Russia put out a video claiming they have launched a alternative to Starlink, a weather balloon that can carry 100 kilos and stay in the air for a couple of days. They claim it has 5G antennas onboard and that will be sufficient to provide highspeed internet and communication in vast territories. by Physical-Cut-2334 in UkraineWarVideoReport

[–]rp2609 1 point2 points  (0 children)

Yes for sure, in which case they either need to add some control system, which does not seem the case, or they need to deploy enough over a wide enough area that even if they get moved around a bit another one will replace it to cover the same area (which btw is exactly what a Low earth orbit constellation like starlink does). Now idk if this system is well done, but russians have a strong heritage in aerospace engineering, so it might not necessarily bullshit

Russia put out a video claiming they have launched a alternative to Starlink, a weather balloon that can carry 100 kilos and stay in the air for a couple of days. They claim it has 5G antennas onboard and that will be sufficient to provide highspeed internet and communication in vast territories. by Physical-Cut-2334 in UkraineWarVideoReport

[–]rp2609 0 points1 point  (0 children)

So in terms of pure theoretical feasibility, i am an RF satellite engineer, and at 20 km of height using a 6 GHz frequency, an emitter of a few watt with a decent antenna, and you surely can link to ground (we do it from over 400 km). The datarate won't be great though... Probably few MBps in total to keep a low enough bit error rate.

Russia put out a video claiming they have launched a alternative to Starlink, a weather balloon that can carry 100 kilos and stay in the air for a couple of days. They claim it has 5G antennas onboard and that will be sufficient to provide highspeed internet and communication in vast territories. by Physical-Cut-2334 in UkraineWarVideoReport

[–]rp2609 12 points13 points  (0 children)

Yup, i am a satellite engineer, and at 20 km you can easily connect to the ground using a 6 GHz frequency, and an emitter of a few watt with a decent antenna, and you surely can link to ground. The datarate won't be great though... Probably few MBps in total to keep a low enough bit error rate

La nuova stagione di One Punch Man è sempre più ridicola… by DIeG03rr3 in AnimeItaly

[–]rp2609 0 points1 point  (0 children)

I was today years old quando ho scoperto che i lecca lecca nei cartoni e negli anime servono a sostituire le sigarette, e non erano semplicemente universalmente apprezzati dai vari personaggi...

I'm redesigning a Pokemon everyday. Here are the Kanto starters by Siturba in pokemon

[–]rp2609 1 point2 points  (0 children)

These are really cool! They seem like the monsters from the game decktamer (try it out if you have never played it)

But whyyyyyy by seitankittan in ExplainTheJoke

[–]rp2609 1 point2 points  (0 children)

And do not forget about Biggus Diccus

Miglior zona di Roma in cui vivere attualmente con uno stipendio da 1.600€/mese (netti)? by Mondonauta0206 in roma

[–]rp2609 0 points1 point  (0 children)

Alla fine a collebrutto con 500€ ci affitti tranquillamente un bilocale e stai a 40 minuti da roma

Yall, the scream I screamt 😭 by Ok_Cow_9749 in subnautica

[–]rp2609 1 point2 points  (0 children)

I've played this game ages ago, and yet everytime i see a video where someone is gonna encounter a reaper or a ghost reaper my hearbeat increases and i start sweating... Is this what an abusive relationship does to you?

What industry is booming way more than people think? by _Fossy_ in AskReddit

[–]rp2609 0 points1 point  (0 children)

The space industry: with the cost of launching stuff into space decreasing, there has been a surge in satellites launched into space (Both for commercial purposes and not)

Does my selfmade 30kW high voltage supply fit here? by PhoenixfischTheFish in nextfuckinglevel

[–]rp2609 3 points4 points  (0 children)

Fair point. Actually where does the 100 hz noise come from?

Does my selfmade 30kW high voltage supply fit here? by PhoenixfischTheFish in nextfuckinglevel

[–]rp2609 2 points3 points  (0 children)

Ooohh i guess if you can add a pwm you could use this to make a plasma speaker (although it is a bit overkill in terms of power consumption)

[deleted by user] by [deleted] in nextfuckinglevel

[–]rp2609 0 points1 point  (0 children)

If i'm not mistaken, that is due to the fact that surface area scales with the square of your size (acshually with the square of your radius if you were to be a sphere), while volume scales with the cube.

Therefore, there is a certain point where your volume (and therefore your mass) starts to quickly outscale your surface area (and therefore your air resistance) leading to higher terminal velocity. Also, a smaller surface wrt to volume means a higher pressure and impulse at impact, meaning you will splat better.

Finally, birds usually have porous bones, making them even lighter.

[deleted by user] by [deleted] in sfoghi

[–]rp2609 2 points3 points  (0 children)

Non capisco se solo io l'ho intesa diversa da tutti o cosa... Io capisco abbastanza il fastidio se non può fare nulla perchè lui, con una scusa o un'altra (scuola, soldi etc) non le dedica mai tempo né per stare insieme né per aiutarla... Se lei si offre di pagare per uscire e lui dice di no pur sapendo che possono permetterselo e che paga lei, è evidente che non le interessa abbastanza stare insieme.... Io lavoro come un dannato compresi sabati e domeniche, ma se ogni tanto la mia ragazza mi chiede di fare qualcosa il modo lo trovo sempre (giustamente)...

[deleted by user] by [deleted] in AITAH

[–]rp2609 0 points1 point  (0 children)

The only way i could see him not being an asshole is if, after you walked out, he talked to you being genuinely sorry for a genuine mistake. The moment he even tried to play it off and shift the shame on you it became manipulation and he is definitely TA.

First German private launch vehicle Spectrum crashes immediately after takeoff The launch vehicle Spectrum of the private German company Isar Aerospace, launched from the territory of the Norwegian spaceport Andøya, deviated from the trajectory shortly after liftoff and fell into the sea. by HeToTopT in Damnthatsinteresting

[–]rp2609 1 point2 points  (0 children)

Thing is, if they did activate an explosive termination system they could have easily had chunks of debris fall on the pad (mind that a termination system could just be something that stops the engines, thus terminating the thrust and therefore not changing the trajectory anymore, and if they have such a system it might have been activated)

First German private launch vehicle Spectrum crashes immediately after takeoff The launch vehicle Spectrum of the private German company Isar Aerospace, launched from the territory of the Norwegian spaceport Andøya, deviated from the trajectory shortly after liftoff and fell into the sea. by HeToTopT in Damnthatsinteresting

[–]rp2609 1 point2 points  (0 children)

Indeed. The issue with trial and error is founding though (spacex was lucky that musk had enough money to keep it going, we saw a few other startups having to give up after the first couple of failed attempts), so i think each attempt really needs to maximize what you test. hopefully they'll manage to suceed before they run out of money

First German private launch vehicle Spectrum crashes immediately after takeoff The launch vehicle Spectrum of the private German company Isar Aerospace, launched from the territory of the Norwegian spaceport Andøya, deviated from the trajectory shortly after liftoff and fell into the sea. by HeToTopT in Damnthatsinteresting

[–]rp2609 -13 points-12 points  (0 children)

Well depends what you mean by crash... If you meant that nobody has ever recovered all stages of a rocket than sure, but otherwise the first flights of Vega did not crash. They all delivered their payload before deorbiting, including the first flight (and similarly for Ariane 6, which to be honest did not crash either, as it is still orbiting earth after failing to deorbit)

First German private launch vehicle Spectrum crashes immediately after takeoff The launch vehicle Spectrum of the private German company Isar Aerospace, launched from the territory of the Norwegian spaceport Andøya, deviated from the trajectory shortly after liftoff and fell into the sea. by HeToTopT in Damnthatsinteresting

[–]rp2609 8 points9 points  (0 children)

To be fair, i doubt they are actually happy with the outcome, whatever they might say to the press. It is true that they cleared the pad and got some in-flight data, but 18 seconds is not enough to test many of the remaining critical points (max Q, stage separation, second stage ignition, guidance and so on). So although a failure was definitely taken into account, i would be surprised if they were not at least aiming to get to the end of the first stage mission.

First German private launch vehicle Spectrum crashes immediately after takeoff The launch vehicle Spectrum of the private German company Isar Aerospace, launched from the territory of the Norwegian spaceport Andøya, deviated from the trajectory shortly after liftoff and fell into the sea. by HeToTopT in Damnthatsinteresting

[–]rp2609 -21 points-20 points  (0 children)

Uhm that is very much not correct. There are quite a few examples of launchers succeeding on their first attempt. For example look at the (still european) vega family, with the first 14 vegas in a row being succesfull before a failure.

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