Artificial Gravity Challenge

[Sir.Mongoose]

Objective: Create a craft to go and orbit Kerbin (Or farther for more of a challenge) and make revolutions to simulate at-least 0.5 of Kerbin's gravity or more.

Requirements:

1. Has to be in 3 or more pieces.

2. Has to orbit any planet, moon, or sun.

3. Have plans in a text or in an image or video.

4. Must keep a Kerbin(s) on it and not let them floating away into space easily.

Optional:

1. Show your challenge at work in a video!

2. Make it orbit something farther than Kerbin for more difficulty.

3. Make it in more than 3 pieces.

4. Make it rid the Galaxy of the flood and call it a Halo.

Example badly detailed plan:

[kahlzun]

You might want to include a: a scoring system, and b: some method of calculation the g-force on a given lever arm, especially if you have no way of calculating its length accuratly?

[bulletrhli]

Also, please read the challenge rules.

[sewerbird]

Will be trying this this evening after work. Here is a preliminary mockup, and will update this post when completed.

[Uberubert]

Not that I see this thread as not-worthy... But isn't the artificial gravity amount based on the diameter of the spinner, as well as the amount of rounds per second/minute/whatever ?

[zarakon]

But isn't the artificial gravity amount based on the diameter of the spinner, as well as the amount of rounds per second/minute/whatever ?

Yes

I believe doubling the radius will double the artificial gravity (centripetal acceleration), if the turn rate stays the same

[lyndonguitar]

I'm sorry but, How do you "make revolutions"?

[automcdonough]

why 3 or more pieces? what is challenging about making a craft and putting spin on it?

[SmallChange]

I'm sorry but, How do you "make revolutions"?

On Soviet Kerbin, revolution makes you!

[m1xte]

OK here goes.

22,3m

I spinned it up to 5 revolutions per 9 secs so 0,555Hz

http://www.calctool.org/CALC/phys/newtonian/centrifugal

27,6G Enough i think

[Sephta]

How did you close the ring? Thought it was not possible?

[Sathurn]

Moar spin, moar gravity, moar sickness.

Moar arm, moar gravity, moar expensive.

must find balance.

[koshelenkovv]

How did you close the ring? Thought it was not possible?

First you place 8 segments in symmetry mode, second you fasten them with struts.

[zarakon]

m1xte, are you able to actually have a Kerbal walk, stand, or even just be held in one spot by the G forces on the inside of the spinning ring?

[m1xte]

Held in one spot like fallen kerbal and camera view spinning around wildly. When i increased the rotation speed he flied through the ring and was flinged from 85x85 orbit in to 35x85 orbit.

The ring is closed with struts. And build with symmetry. Every segment is turned one click (5 degrees).

Different lenght of struts is used in the arm to make the arm exactly the right length to form a beautiful circle.

If i see correctly from my own picture three long H-beams and three long girders connected to 2m landercan makes the right length arm for 8x symmetry and 1 click for every 2x2 structural panel.

[zarakon]

maybe try reducing your rotation speed so that it matches 1G

[m1xte]

More testing.

I think maximum spin rate of craft is capped to one revolution per 2 seconds, because i could not get more. Even thou i had enough fuel.

It didnt explode and get rid of flood in all galaxy.

Nor did the thermometer installed in certain location in bop react.

Only psychedelic wobbling.

I heard that the rover wheels are bugged to break instantly if you are trying to drive in orbital construction.

Maybe i should try old fashion rcs rover.

[m1xte]

Ok.

I tested my ring with rcs rover but as soon as i switched craft the spin on my ring gradually stopped.

Then i tried to drive around the ring to create centifugal force with the rower but it was too difficult because the beams in the middle of the ring keep bouncing me sidways.

Driving around the ring knocked the rover out of the ring and the ring started its psychedelic wobble again out of nowhere.

Hmmmm....

I think i need to build new U-shape ring where beams are not connected at the bottom. Then i'll put landing gears on the bottom and on the sides of my rower to keep the rower on the "track" and drive around the ring really fast.

Buahahahahahhahaaaaa..

Flood will be extinguished, kraken will awake and i'll achieve FTL travel.

[zarakon]

Can you post that craft file?

I feel like stress-testing my CPU

[m1xte]

gravitylab.craft

I removed mechjeb so it is stock craft.

Launch procedures.

Dont use mechjeb autopilot it will work really long and hard to destroy the craft and will eventually succeed.

I think with mechjeb 2 throttle control will help if you set it to limit to terminal velocity and to ~20m/s^2 acceleration.

I launched in manual control.

1. Stage

Just let it fly using only minimal controls when needed.

You can start gravity turn at the end of this stage. This stage have more control authority than the next stage.

Keep your spin at 0

2. Stage

Gravity turn.

Spin control gets harder.

Limit your throttle as the TWR gets up.

3. Stage

Careful not so stable starts wobbling easily.

Get your apoapsis to about 80-90km.

As soon as you enter space start circularising.

Watch the wobble limit your throttle heavily.

[m1xte]

Bobbert why you look at me.

You are kerbonaut you should be smart enough to understand that looking through that hole in 27G gravity is a bad idea.

I almost had a moment of sympathy, but then it passed.

[SmallChange]

Wow... I didn't think I would get the results I did!

Started off with a ring design, then I realized the simplicity of sewerbird's method was probably something to emulate. Boxes on poles. That's about it!

Flew her up, got umm.. can't remember who the guinea pig was, into place and fired up the little radials for rotation. Poor little guy was pinned to the wall immediately!

(I don't think he was having fun)

Best part of the test for me? Climbing up the ladder and letting go. Damned if he didn't hit the floor like a sack of potatos! (couldn't really get a good shot of that in action though)

EVA RCS either wasn't powerful enough to lift him, or the game got confused with all the rotation. Either way, he wasn't going anywhere. Wasn't able to walk around, seemed more like when Kerbals think they are falling on solid ground and freeze.

Fun times!

(Apologies to Sir.Mongoose if I missed one of the challenge requirements. I was mostly just playing around)

***Edit: Note to self: Next time, put some lights on the thing or time your launch for daylight)

[m1xte]

Kerbal wheel of fortune .

Bobbert is now a happy kerbal he was flinged to 85x145 orbit.

Ludlie is not so happy with his 35x85 orbit.

My zero G roller coaster cart got stuck in the U shape ring.

I think i need to try V shape next.