The Pod Bay

TildalWave

00:00

oh wait now there's an hour of complimenting each other

duzzy

:P

I actually just closed the tab because it seemed all the interesting stuff stopped.

Hohmannfan

I accidentally did the same :P

duzzy

They were just talking about how they're all great friends, so I did it on purpose.

Russell Borogove

Altitude dip: second stage TWR is much less than 1.0, so the rocket falls past apogee before getting up to orbital speed.

Hohmannfan

I figured that out, but thanks for writing an answer about it. There are probably more people wondering

duzzy

00:04

I didn't figure it out, and was still wondering why.

I'm not an engineer. :(

I'm just a nerd that likes space stuff.

Hohmannfan

same here ;)

Russell Borogove

That's a dinky little engine on the second stage. The Merlin on Falcon 9 produces more than 10x the thrust, on a rocket that's a little smaller overall.

Way more fuel-efficient though.

TildalWave

@Hohmannfan basically it's recovering a bit of gravity drag losses by focusing on getting to orbital speed

PearsonArtPhoto

That doesn't quite seem right. The TWR wouldn't be it alone...

TildalWave

English @Pearson ... English! :)

Russell Borogove

00:08

If TWR was substantially more than 1, it could keep pushing the apogee up. waves hands, creates trigonometry diagrams

It's really hard to put into words what's going on there. The horizontal velocity makes it "gain altitude" by letting the earth curve out from under it, but it's doing so at a slower rate than gravity.

TildalWave

actually, didn't we have a question about that already?

duzzy

@RussellBorogove Sometimes I wish this chatroom was an actual room.

Russell Borogove

@duzzy with a whiteboard.

Hohmannfan

446 s for the HM-7B, compared to 348 s for merlin 1D vacuum.

duzzy

Yes!

TildalWave

00:10

with all this hand waving, we wouldn't even need AC

duzzy

:P

Russell Borogove

Hmm actually putting it in terms of TWR <> 1 is a little misleading, you're right

I may rephrase.

TildalWave

look point is .... waving hands ... see?

PearsonArtPhoto

0

A: What is the reason for the Ariane 5 launcher with Intelsat 29e losing altitude?

We know that the tough part of getting to space isn't getting there, it's going fast enough to stay there. One of the key reasons is that the rocket is concentrating more on gaining horizontal speed than vertical height. So the rocket will eventually start being pulled down vertically. The atm...

The reason isn't so much the low TWR, it's because the rocket is concentrating more on increasing the horizontal speed.

KSP has taught me something:-)

Even if the TWR was greater than 1, it would still be concentrating it's acceleration horizontally, and might dip.

TildalWave

well yes, and quarter of an orbit later what was before falling towards the surface is now momentum in velocity vector

you know it's a bit like competitive skiing,... you're gonna go a whole lot faster through the track if you can keep close to the gates

or not :)) sorry, I was just looking for a reasonable analogy

Russell Borogove

00:19

Rewrote to avoid the focus on TWR

duzzy

You guys are awesome. It makes sense to me.

PearsonArtPhoto

Your answer does make sense now, but I'll leave mine.

Anytime I get to use an XKCD graphic is a win:-)

duzzy

Yes, leave it. I upvoted both.

PearsonArtPhoto

Besides, it's one answer closer to that silver badge...

Hohmannfan

The optimal strategy is to neglect vertical velocity, and ignore friction from crashing into the ground

duzzy

00:22

@PearsonArtPhoto :P

PearsonArtPhoto

It's a race for me now, get the launch silver tag badge, or Epic.

Russell Borogove

You could even take advantage of the ground by putting a lithofoil on an extensible arm to produce lift. Lithoplaning.

TildalWave

@PearsonArtPhoto have you tried...

PearsonArtPhoto

LOL.

TildalWave

or freehand circles

PearsonArtPhoto

00:28

Actually, I have a fair chance of hitting #48 today, which means that I should be there soon...

TildalWave

owww @Pearson you nuked it.... I actually wanted to stay there with my snark comment :D

for a while at least

PearsonArtPhoto

I don't respond to enough flags, when I see an easy one, I have to take it;-)

TildalWave

What I do is I downvote it so I later remember that I want my point back :))

Hohmannfan

00:47

Can I "store" reputation as down-votes, in order to workaround the rep-cap? (Not a good idea to mention it with two mods around though..)

TildalWave

@Hohmannfan yes, it is possible, but you'll then have to hope that those posts are either deleted or edited so you can remove your downvote

also, we're mods not SE devs, we don't have to keep bugs a secret :P

but we might have to suspend you if you use them to your advantage LOL

your account at least

mind, you'll also need additional upvotes after you reach rep cap... and it's all for naught if we recalc your rep :P

PearsonArtPhoto

I didn't think you could...

I've never seen it work, at least...

TildalWave

you get to 200, downvote, you're at 199, someone upvotes you, you're back to 200 ... you undownvote the day after, you get +1 back

I did it once by chance on sec.se

PearsonArtPhoto

Maybe I've just never seen it. Interesting...

TildalWave

then it was confirmed by the bear that reaches rep cap nearly every day there

geoffc

05:41

Rudd vs Hawking in Quantum Chess.

Anyone Can Quantum

►

duzzy

05:59

I want to play quantum chess.

geoffc

14:42

@kimholder SpaceX MCT announcement will be at IAC 2016 in Mexico.

"We'll have a next generation rocket and spacecraft beyond the Falcon Dragon series and I'm hoping to describe that architecture later this year at International Aeronautical Congress..."

https://youtu.be/pIRqB5iqWA8?t=30m40s

67th International Aeronautical Congress, Guadalajara Mexico, 26th-30th September 2016

How far is that from you? (Being entirely ignorant of geography in Mexico.)

kim holder

14:58

@geoffc oooohhh mannn..... IAC is expensive.... (fret)

geoffc

But out of curiosity, how far away is it? I know Mexico is a teeny tiny country the size of Rhode Island or Texas... So how far could it be?

kim holder

it is about 3.5 hours, and of course we (i? - hubby will not be very interested and likely busy) could stay at a cheaper hotel...

i've already wondered about it, but it is quite expensive. don't remember what the figure is, high enough that i looked at it and said 'well, forget that'...

but it has stayed in the back of my mind. i did mention it to aldo, and he was open to the idea depending on what exactly is going on at the time.

actually looking now i can't find a price. where did i see that? did someone tell me?

yeah, a thousand euros last year in jerusalem.

@geoffc are you thinking of going?

geoffc

@kimholder Sure... That is likely. Alas. No. Though I am seriously thinking about going to watch a launch out of LC-40/39A...

kim holder

15:14

i'd love to do that too. probably will have to wait a year or two though.

PearsonArtPhoto

17:24

Answer to the Dreamchaser question: It won't crash.

Hohmannfan

17:51

...probably

PearsonArtPhoto

Hopefully...

I actually saw the Dream Chaser prototype that crashed, before it crashed.

Hohmannfan

Maybe I can start my own space company? I have a barge, so I only need a rocket to crash into it.

kim holder

@PearsonArtPhoto jealous...

duzzy

@Hohmannfan You have a barge? I want a barge. How do you get a barge?

Hohmannfan

@duzzy I built it. I was like ten years old. I am from an island.

duzzy

18:07

You're from an island? I want to be from an island. How do you come from an island?

Hohmannfan

Here it is: google.com/maps/place/…

duzzy

That is really cool.

Can I come visit?

Hohmannfan

Why not :)

kim holder

apparently you are from a grocery store.

duzzy

Coop!

kim holder

18:13

also somehow they managed to convince google maps they are at 32 N. this is misleading and i advise caution :P

Hohmannfan

@kimholder Oups! That was a secret Israeli rocket silo!

kim holder

:D

Hohmannfan

I suppose that is actually the case, as they have moved my bookmarked location to a little distance

My barge is visible online!

duzzy

lol that's awesome.

kim holder

that is indeed pretty neat. it looks like a lovely place to swim, if maybe you have a thick wetsuit.

fishing?

Hohmannfan

18:21

Fishing, wetsuit swimming, and that sort of things

David Freitag

18:36

@Hohmannfan Wow, UPS must hate you :D

kim holder

.-'----. ,' . | \ | \ \ _ \ ,\ _ ,'-,/-)\ ( * \ \,' ,' ,'-) `._,) -',-') \/ ''/ ) / / / ,'

@DavidFreitag do i program an ascii art face by entering it line by line?

David Freitag

@kimholder The problem with ascii art is that it's multi-line, and I don't think the input in that window supports multi-line text

kim holder

ok. i vaguely remembered you saying it can do pictures? does it have to be with imgur or am i doing something else wrong?

ah, okay. maybe i formatted something wrong the other day

TildalWave

@kimholder face lime?

sorry, facepalm

kim holder

limepalm

TildalWave

18:46

sounds like some shower gels

PearsonArtPhoto

@kimholder It's a long story, and I almost certainly was somewhere I wasn't supposed to be, but...

kim holder

oh, that is so much better even :]

did you have a spy camera too? :D

PearsonArtPhoto

No.

That could have gotten me in some serious trouble, as it was...

Hohmannfan

In an archived chat, nobody has a spy camera

TildalWave

next time you use speech to text to browse to to Area 51 to see how our site is doing, try to disable your car navigation's speech recognition first

go to Area 51

Hohmannfan

18:49

@TildalWave Especially for us living on the European side of the Atlantic ocean

PearsonArtPhoto

Wow, we have 36 users with 3K reputation...

Hohmannfan

I am That #37 below :(

(2963)

duzzy

@TildalWave lol

PearsonArtPhoto

For reference, Dream Chaser is run out of the larger Denver Colorado area, in an unclassified space.

Hohmannfan

19:21

Any recommendations of a SE site where knowing random stuff and things about space is useful?

kim holder

@Hohmannfan 37 users over 3k tomorrow

geoffc

22:01

@PearsonArtPhoto It was like the Jason-3 Falcon 9 first stage. It landed, then a leg/wheel collapsed. :)

@Hohmannfan fixed that.

Hohmannfan

Yay! Nerd number 37!

James Jenkins

Not sure if any one has noticed or cares, but Space is about 3 months from hitting 1,000 days in Beta. area51.stackexchange.com/proposals/43283/space-exploration Might be worthy of some type of celebration

Hohmannfan

How many of you have been here since the commitment? @PearsonArtPhoto for sure, but who else?

geoffc

I think I was.

PearsonArtPhoto

space.stackexchange.com/help/badges/66/precognitive

space.stackexchange.com/help/badges/30/beta

The later is probably best.

Yes, geoffc has beta, so...

Hohmannfan

22:11

And @TildalWave , @RoryAlsop and @SF too.

Rory Alsop

22:31

:-) I blame @TildalWave... I think :-)

Wonder what the longest time in beta is

Congrats on your 3k @Hohmannfan

Hohmannfan

Definitely going to drink a cup of tea with milk now!

@RoryAlsop Longest time in beta? board and card games 1927 days

Rory Alsop

22:49

@Hohmannfan wow!

actually - even more wow: just noticed @TildalWave has 48k rep! Awesome!

Hohmannfan

My SE history: Back in June I posted a badly written answer. Then I did not visit the site for nine months. In December I visited again, and saw that my answer got 1 upvote, and some helpful suggestions for improving it. That motivated me to try to contribute to SEx.SE for real, and well, now I am hooked.

2

Rory Alsop

@Hohmannfan that's excellent - the best kind of effect an upvote with comments has

Hohmannfan

Congrats with 48K @TildalWave !

kim holder

23:05

@Hohmannfan the system works, sometimes in mysterious ways :]

Hohmannfan

kim holder

oh my god you're teeny weeny!

should i be swearing in front of you? :D

Hohmannfan

Extreme partying with tea and sticky note!

kim holder

dude, you are going to be a total uber-nerd in a few years

i think you have to be our youngest regular. maybe you'd have to duke it out with Vedant for that honor.

cheers, man!

Hohmannfan

"man" is not the right word :P

kim holder

23:10

heheheheh

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