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kksweety

[SOLVED] #185 - purple - spin cycle

**Posted:** Tue Jul 12, 2005 2:01 pm

ariadne_ac · Boot Joined: 20 May 2005 Posts: 29

PC has a Mars planet...how interesting... it seems we occupy a similar space in the universe at least.

**Posted:** Tue Jul 12, 2005 2:04 pm

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KSG · Decorated Joined: 12 Jan 2005 Posts: 186 Location: WA, USA

That, or it's another sign of their Earth obsession, just like their fashions, libraries of our books, and stores full of replicas. There's no way to tell which yet.

**Posted:** Tue Jul 12, 2005 2:19 pm

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firefox · Unfettered Joined: 28 Jul 2004 Posts: 333

are there any figures on the diagrams, circumference of the spinning thing by any chance? if not then its a bit trickier.

edit: jeb just pulled up a magical forumla in chat (which overlooked) and hes posting the solve now. wiggle factor of about 3m with different values for mars' gravity.

edit edit: could be wrong. sigh

kksweety

nope no figures at all... just counterweight one side, hab the otherside and tether wrote in the middle

**Posted:** Tue Jul 12, 2005 2:45 pm

JebJoya · Unfettered Joined: 13 Apr 2005 Posts: 679 Location: UK

Right...

**Posted:** Tue Jul 12, 2005 2:49 pm

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firefox · Unfettered Joined: 28 Jul 2004 Posts: 333

this site was helpful is reassesing what we already knew

http://www.graybiel.brandeis.edu/history/finalfrontier.html

i think we need to decide on a good speed for the thing to be rotating at and guesstimate backwards, then tie in the formulas. i personally can't see where Jeb went wrong.

**Posted:** Tue Jul 12, 2005 3:24 pm

step

I just found this site which corroborates Jeb's solution.

**Posted:** Tue Jul 12, 2005 3:54 pm

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JebJoya · Unfettered Joined: 13 Apr 2005 Posts: 679 Location: UK

see?

Jeb

(ps, sorry for the tone, this really got under my skin, mainly because I was worried that I got it wrong - fyi, the outside capsule moves at about 60-70 km/h to create the force, so it's not that short a length Smile

)

**Posted:** Tue Jul 12, 2005 6:23 pm

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looosy · Boot Joined: 04 Aug 2005 Posts: 48 Location: Kent, England

If you go to http://www.marsinstitute.info/rd/faculty/dportree/rtr/ma18.html it gives an overview on how small missions to Mars could overcome the gravity issue - ie. using tethers.

The following is a quote from the website "The Concept 4 vehicle is a large dish-shaped aerobrake with twin Space Station Freedom-derived cylindrical habitats. The spacecraft relies on tethers to create artificial gravity; the astronauts reel out the habitat modules from the aerobrake, then spin the assemblage about its center of mass (roughly midway along the tether). Gravity level depends on tether length and spin rate. For example, generating one terrestrial gravity requires a 2936-foot tether if the spin rate is held to one rotation per minute; generating Mars gravity at two rotations per minute requires only a 278-foot tether."

287 feet converts to 84.73m

Which seems to agree with the previos answer +or- marsG value.
Very Happy

**Posted:** Thu Aug 04, 2005 3:35 pm

Kvasir · Boot Joined: 15 Oct 2005 Posts: 48

Argh! I hate approximations.
Was working from a Mars gravity of 0.38 rather than 0.3822 and it makes a full two metres difference.
So I'm locked out for 24 hours....