Author Topic: Landing a stage back on a barge is easy. Right?  (Read 11955 times)

Offline kevinof

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Landing a stage back on a barge is easy. Right?
« on: 09/18/2015 09:27 am »
Wrong but I'm gonna blame the keyboard. Gave this to my kid to explain the physics of getting the stage back. It's fun.

https://scratch.mit.edu/projects/76866912/

ps. Yes it shouldn't let you ascend with lots of power but hell it's just a game.

Mods - if this has been posted before feel free to delete.

Offline Celebrimbor

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Re: Landing a stage back on a barge is easy. Right?
« Reply #1 on: 09/18/2015 10:22 am »
Magnificent!  Bravo!

I found it infuriating after about 5 minutes though  ;D

I'll show it to my boys tonight - but tears are guaranteed...

Offline JamesH

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Re: Landing a stage back on a barge is easy. Right?
« Reply #2 on: 09/18/2015 10:29 am »
Wrong but I'm gonna blame the keyboard. Gave this to my kid to explain the physics of getting the stage back. It's fun.

https://scratch.mit.edu/projects/76866912/

ps. Yes it shouldn't let you ascend with lots of power but hell it's just a game.

Mods - if this has been posted before feel free to delete.

What do you mean shouldn't let it ascend? The one engine at full power can easily launch and lift an empty stage. that's the whole reason for a hoverslam.

Offline kevinof

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Re: Landing a stage back on a barge is easy. Right?
« Reply #3 on: 09/18/2015 10:36 am »
It was my understanding that the stage couldn't hover - it had enough power to slow the stage to zero at the right moment, but not any more than that. Maybe I'm wrong there.

Another point - I didn't write it. Just want to make that clear although my son now want's to create one that does the boostback burns as well!

Wrong but I'm gonna blame the keyboard. Gave this to my kid to explain the physics of getting the stage back. It's fun.

https://scratch.mit.edu/projects/76866912/

ps. Yes it shouldn't let you ascend with lots of power but hell it's just a game.

Mods - if this has been posted before feel free to delete.

What do you mean shouldn't let it ascend? The one engine at full power can easily launch and lift an empty stage. that's the whole reason for a hoverslam.
« Last Edit: 09/18/2015 12:38 pm by kevinof »

Offline Joaosg

Re: Landing a stage back on a barge is easy. Right?
« Reply #4 on: 09/18/2015 11:19 am »
I fell like this game is Angry Birds rocket edition.. :)

Offline JamesH

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Re: Landing a stage back on a barge is easy. Right?
« Reply #5 on: 09/18/2015 12:34 pm »
It was my understanding that the stage couldn't hover - it had enough power to slow the stage to zero at the right moment, but not any more than that. Maybe I'm wrong there.

Another point - I didn't write it. Just want to make that clear although my son now want's to create one that does the bootback burns as well!

Wrong but I'm gonna blame the keyboard. Gave this to my kid to explain the physics of getting the stage back. It's fun.

https://scratch.mit.edu/projects/76866912/

ps. Yes it shouldn't let you ascend with lots of power but hell it's just a game.

Mods - if this has been posted before feel free to delete.

What do you mean shouldn't let it ascend? The one engine at full power can easily launch and lift an empty stage. that's the whole reason for a hoverslam.

The engine has too much power to hover (which clearly it needs or it wouldn't be able to slow down), so it s matter of timing to get the engine ignition and throttle spot on to give 0 velocity at 0 height.  As people who play the game are finding out!


Offline Chris Bergin

Re: Landing a stage back on a barge is easy. Right?
« Reply #6 on: 09/18/2015 05:16 pm »
Nailed it on attempt 11! ;D
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Offline kevinof

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Re: Landing a stage back on a barge is easy. Right?
« Reply #7 on: 09/18/2015 05:45 pm »
Photos or it didn't happen!

Nailed it on attempt 11! ;D

Offline S.Paulissen

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Re: Landing a stage back on a barge is easy. Right?
« Reply #8 on: 09/18/2015 06:22 pm »
Nailed it on attempt 11! ;D


Took me about 20-30 tries.  No way to take a pic, it resets immediately.

EDIT: Panicky print screen on another success worked.
« Last Edit: 09/18/2015 06:25 pm by Exclavion »
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Offline eeergo

Re: Landing a stage back on a barge is easy. Right?
« Reply #9 on: 09/18/2015 06:24 pm »
Nailed it on attempt 11! ;D

Well it only took me around 300... your rocket fu speaks for itself, no wonder you're NSF's boss ;)
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Offline Helodriver

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Re: Landing a stage back on a barge is easy. Right?
« Reply #10 on: 09/18/2015 06:35 pm »
Nailed it on attempt 11! ;D


Took me about 20-30 tries.  No way to take a pic, it resets immediately.

EDIT: Panicky print screen on another success worked.


Looks like that landed somewhere around N12, Anyone who called that, gets the prize   ;)

Offline Barrie

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Offline Jarnis

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Re: Landing a stage back on a barge is easy. Right?
« Reply #12 on: 09/18/2015 06:56 pm »
Nailed it on attempt 11! ;D

Let's hope SpaceX has better Rocket-Fu skillz and manages it with less tries in real life :)

Offline MattMason

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Re: Landing a stage back on a barge is easy. Right?
« Reply #13 on: 09/18/2015 07:34 pm »
Apparently posting this game link to NSF (as well as having found itself on several soclal websites) has caused Cthulhu, Elder God of Boring Fridays, to declare that we are all having too much fun at once...
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Offline S.Paulissen

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Re: Landing a stage back on a barge is easy. Right?
« Reply #14 on: 09/18/2015 07:40 pm »
Awwww, they nerfed the game.  It's impossibly easy now.  In order to challenge myself I tried to land successfully using the least amount of fuel. 

I'm down to 11.6 (i.e. I only used 0.4 to land)
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Offline kirghizstan

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Re: Landing a stage back on a barge is easy. Right?
« Reply #15 on: 09/18/2015 07:50 pm »
ok I need to see a video of this happening

Offline S.Paulissen

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Re: Landing a stage back on a barge is easy. Right?
« Reply #16 on: 09/19/2015 05:00 pm »
ok I need to see a video of this happening

I went back to the original difficulty.  (Apparently there are two versions of the game and I found the easy one the second time around).  The lowest fuel usage I could get is ~7.5.  I missed the SS, but finishing with slightly below 7 is the fat part of my bell curve when shooting for low fuel usage.

EDIT: OVER 8 WOOOOOO!
« Last Edit: 09/19/2015 05:16 pm by Exclavion »
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Offline Robotbeat

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Re: Landing a stage back on a barge is easy. Right?
« Reply #17 on: 09/20/2015 01:29 am »
There ARE other levels, you know! :)
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Online meekGee

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Re: Landing a stage back on a barge is easy. Right?
« Reply #18 on: 09/20/2015 02:14 am »
SpaceX interview process...
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Offline TomH

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Re: Landing a stage back on a barge is easy. Right?
« Reply #19 on: 09/20/2015 09:27 pm »
It was my understanding that the stage couldn't hover - it had enough power to slow the stage to zero at the right moment, but not any more than that. Maybe I'm wrong there

You are correct. It can't come even close to hovering. It comes in at high velocity and high retro thrust, and the computers have to do a perfect deceleration to V=0 and Z(axis, i.e. altitude above deck)=0 both occur at the same moment in time. That's why they call it a hover slam. Obviously X and Y axes have to be correct, with little to no lateral drift and almost perfectly vertical.

A human could never perform this maneuver in reality, only high powered computers with advanced accelerometers, altimeters, other sensors.
« Last Edit: 09/20/2015 09:30 pm by TomH »

Offline Oersted

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Re: Landing a stage back on a barge is easy. Right?
« Reply #20 on: 09/21/2015 07:13 pm »
This obviously works like that old 1980's gem of a movie, The Last Starfighter, where the young kid who showed incredible skills at a console game was recruited to the space forces... Whoever nails 50 consecutive landings will get a call from SpaceX.. :-)   

Offline JamesH

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Re: Landing a stage back on a barge is easy. Right?
« Reply #21 on: 09/22/2015 08:23 am »
This obviously works like that old 1980's gem of a movie, The Last Starfighter, where the young kid who showed incredible skills at a console game was recruited to the space forces... Whoever nails 50 consecutive landings will get a call from SpaceX.. :-)

One of the first films to use CG, loved that film! (being into computers, games and computer graphics!)

Offline MattMason

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Re: Landing a stage back on a barge is easy. Right?
« Reply #22 on: 09/23/2015 12:31 am »
This obviously works like that old 1980's gem of a movie, The Last Starfighter, where the young kid who showed incredible skills at a console game was recruited to the space forces... Whoever nails 50 consecutive landings will get a call from SpaceX.. :-)

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Offline CameronD

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Re: Landing a stage back on a barge is easy. Right?
« Reply #23 on: 09/23/2015 11:34 pm »
This obviously works like that old 1980's gem of a movie, The Last Starfighter, where the young kid who showed incredible skills at a console game was recruited to the space forces... Whoever nails 50 consecutive landings will get a call from SpaceX.. :-)

"Greetings, Dragonrider! You have been recruited by the Exploration League to begin the Mars Armada..."

Someone's been watching too many movies.. :)
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Offline aceshigh

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Re: Landing a stage back on a barge is easy. Right?
« Reply #24 on: 10/11/2015 05:50 am »
Wrong but I'm gonna blame the keyboard. Gave this to my kid to explain the physics of getting the stage back. It's fun.

https://scratch.mit.edu/projects/76866912/

ps. Yes it shouldn't let you ascend with lots of power but hell it's just a game.

Mods - if this has been posted before feel free to delete.

at 2nd level, the barge moves half itīs size in a tenth of a second. That would be like the real barge moving 50 meters in 1/10th second, or 500 meters per second!

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