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PlaywithLAMs
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PostPosted: 03-May-2010 20:49    Post subject: ? about gravity decks Reply to topic Reply with quote

How do I determine the size of a gravity deck for a spacecraft? How far does the gravity deck's artificial gravity field extend?
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Stinger
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PostPosted: 03-May-2010 21:50    Post subject: ? about gravity decks Reply to topic Reply with quote

From what I remember they come in 50, 100, 150 meter units.
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Vagabond
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PostPosted: 04-May-2010 03:39    Post subject: ? about gravity decks Reply to topic Reply with quote

The gravity is caused by motion not by a generated field.

see this article- rotation
en.wikipedia.org/wiki/Artificial_gravity
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Rudel Gurken
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PostPosted: 04-May-2010 10:26    Post subject: ? about gravity decks Reply to topic Reply with quote

You can choose the Diameter of your Grav Deck.
There are three categories for determining weight and costs (diameter each):
Small: < 100m
Medium: 100 - 250m
Heavy: > 250m (only allowed for Space Stations)

As Vagabond pointed out they don't produce gravity via a strange gravity field but by plain and simple centrifugal force.
So only things and persons on the Grav Deck itself experience gravity. The rest of the ship doesn't.
If the ship accelerates or deccelerates (or performs any maneuver at all) the Grav Deck has to be locked in place for that time.
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ralgith
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PostPosted: 07-May-2010 13:42    Post subject: Re: ? about gravity decks Reply to topic Reply with quote

Rudel Gurken wrote:
You can choose the Diameter of your Grav Deck.
There are three categories for determining weight and costs (diameter each):
Small: < 100m
Medium: 100 - 250m
Heavy: > 250m (only allowed for Space Stations)


Most Warship and Jumpship grav decks are 80 to 120 meters if you look at their specs (for canon units I mean). Though I think there are a few smaller than 80, I can't think of any larger than 120 right now.
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Rudel Gurken
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PostPosted: 08-May-2010 02:24    Post subject: Re: ? about gravity decks Reply to topic Reply with quote

Sure, you have to think a bit before choosing a diameter Wink
A 270 m long ship would look rather funny with a 250 m grav deck Very Happy

The smallest grav decks in official designs have 40 m diameter (Merchant jumpship) and the biggest have 210m (Avalon Cruiser).
A lot of the bigger ships have two or three grav decks and the Leviathan even 8.

The Olympus Recharge Station on the other side has an 1230 m grav deck.
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Sleeping Dragon
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PostPosted: 08-May-2010 04:07    Post subject: Re: ? about gravity decks Reply to topic Reply with quote

Flying saucers anyone? Twisted Evil
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PlaywithLAMs
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PostPosted: 11-May-2010 10:15    Post subject: Re: ? about gravity decks Reply to topic Reply with quote

Thanks everyone for your input. I guess I'll just choose the gravity deck sizes arbitrarily.
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Vagabond
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PostPosted: 12-May-2010 08:58    Post subject: ? about gravity decks Reply to topic Reply with quote

or you could read a little and make an informed choice;

wrote:
To reduce Coriolis forces to livable levels, a rate of spin of 2 rpm or less would be needed. To produce 1g, the radius of rotation would have to be 224 m (735 ft) or greater, which would make for a very large spaceship. [snip] Artificial gravity at 0.1g would require a radius of only 22 m (74 ft).
- Wikipedia

So decide how much gravity you want the crew to experience, multiply the gravety by 10, and then multiply it by 22.4 to determine the radius needed.

0.1g of artificial gravity = 22.4m radius gravdeck
0.4g of artificial gravity = 89.6m radius gravdeck
0.5g of artificial gravity = 112m radius gravdeck
1.0g of artificial gravity = 224m radius gravdeck

so this is your choices:
small gravdeck (up to 99m) - weight 50 tons; max Gs generated 0.44g)
medium gravdeck (up to 250m) - weight 100 tons; max Gs generated 1.11g)
large gravdeck (up to 1500m) - weight 500 tons; max Gs generated 6.69g)

Note - you can have a number of gravdecks equal to 3 + 1 per 100,000 tons.
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