Stretched-out version of geodesic dome?

[Maventulep]

Hi,

I'm looking into setting up a geodesic greenhouse dome in my garden. Unfortunately it's one of those very long, very narrow city gardens that don't allow for a terribly great dome diameter. As a solution I was looking for a somewhat stretched-out model and found it:

http://sketchup.google.com/3dwarehouse/details?mid=5eab88bc25babd07efed69d6cb3a4e43

I have about 3.6 meters (say 12 feet) of garden width available and, using above model, that would result in a length of about 18 feet. Since I'm rather new to this, that's about as far as I got and I have some initial questions:

1) the model above is a 4v one. Wouldn't it be more appropriate for this size greenhouse to use a 3v model and would that be an option for this shape?
2) I had hoped to accomplish a height of about 3 meters (almost 10 feet). Since I thought to approach the greenhouse like this: http://sketchup.google.com/3dwarehouse/details?mid=fe572326700e392a2137e32e8ebf2b1 I would come up short by about almost 3.5 feet. How would I go about this?

3) Suppose that all works out, that still leaves the building bit (establishing strut lengths, angles). How do I set about doing this? The idea is to use wooden struts and to put paneling on top of it. I don't see myself having any trouble putting it together, it's just figuring out the specs that is not all too obvious to me yet.


Thanks,

Joris

[Paul From Geo-Dome]

Hi Joris,

            I have plans for something really close to what you are looking for, let me know if this is OK 

http://www.geo-dome.co.uk/domeshop/article.asp?Uname=292

I've also built one so if you have any questions feel free to get in touch.

Cheers,

            Paul

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[TaffGoch]

Hi, Joris,

The "lozenge" or "tunnel" geodesic greenhouse has been a topic, here, before.

The attached image is what I posted in a previous disscussion. I chose 4v, because it can be "split" down the middle, to build half along a south-facing wall of a house. (Since it is a class-II dome, only even frequencies can be built, using this geometry.)

-Taff

[TaffGoch]

Here's the previous discussion, if you're interested:

http://groups.google.com/group/geodesichelp/browse_thread/thread/d5af2c58c485ec41/c5247e67ca23bd06

[TaffGoch]

Joris,

If width is limited to 12 feet, the height will be limited to ~6 feet, if you truncate the dome/sphere at it's equator.

Of course, you can always build the dome on a riser wall, adding 3-4 feet to the height.

[Maventulep]

Hi Paul,

Looks nice! Am I correct in understanding that the tunnel baseline forms a wavy pattern? And that would result in the tricky bits you mentioned, right? With some angles folding inwards? I'm still trying to understand how this whole categorization works and what kind of patterns/shapes/symmetries result from that. For instance, what does GD5 refer to?

On Thursday, June 28, 2012 11:47:19 PM UTC+2, domepauly wrote:

Hi Joris,

            I have plans for something really close to what you are looking for, let me know if this is OK 

http://www.geo-dome.co.uk/domeshop/article.asp?Uname=292

I've also built one so if you have any questions feel free to get in touch.

Cheers,

            Paul

Hi,

I'm looking into setting up a geodesic greenhouse dome in my garden. Unfortunately it's one of those very long, very narrow city gardens that don't allow for a terribly great dome diameter. As a solution I was looking for a somewhat stretched-out model and found it:

http://sketchup.google.com/3dwarehouse/details?mid=5eab88bc25babd07efed69d6cb3a4e43

I have about 3.6 meters (say 12 feet) of garden width available and, using above model, that would result in a length of about 18 feet. Since I'm rather new to this, that's about as far as I got and I have some initial questions:

1) the model above is a 4v one. Wouldn't it be more appropriate for this size greenhouse to use a 3v model and would that be an option for this shape?
2) I had hoped to accomplish a height of about 3 meters (almost 10 feet). Since I thought to approach the greenhouse like this: http://sketchup.google.com/3dwarehouse/details?mid=fe572326700e392a2137e32e8ebf2b1 I would come up short by about almost 3.5 feet. How would I go about this?

3) Suppose that all works out, that still leaves the building bit (establishing strut lengths, angles). How do I set about doing this? The idea is to use wooden struts and to put paneling on top of it. I don't see myself having any trouble putting it together, it's just figuring out the specs that is not all too obvious to me yet.


Thanks,

Joris

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[Maventulep]

Hi Taff,

Thanks for the info and the link. Am I to understand that if I were to take a full 3v, class I sphere, I can spin it around (in SketchUp for instance) and find a symmetry that allows me to split it in two and add a geodesic tunnel segment? Also, I'm afraid you lost me in your discussion with Blair in the link you provided arguing a quarter split instead of a half, unless you mean a quarter split of the full sphere, of course? Did I just answer my own question?

Also, regarding that riser wall, I was hoping not to raise that any higher than the raised flowerbeds in the greenhouse. Would there be any other options that you can think of keeping the triangular structure? Or, even if possible, do you think that's simply not a good idea?

And finally, can you point me to a good explanation about that whole class and method subdivision structure? Not getting any of that right now... well, hardly anything.

Thanks,

Joris

[Paul Robinson]

Hi Joris,

              Yes you are correct with the wavy base observation, the whole central tunnel section has some negative dihedral angles. there are still only two basic triangle measurements for the whole dome though, just different dihedral angles to cut.

I have video tutorials on my youtube channel: https://www.youtube.com/user/pauly1060

The gd5 is a reference to a standard 2v dome plan I do. I took this plan and added the middle tunnel section: http://www.geo-dome.co.uk/domeshop/article.asp?Uname=282

Notice how this design uses much more of the 2v sphere to get decent headroom. cuts down on floor space though.

Cheers,

              Paul

P.S I'm sure I have drawing to make a paper model laying about somewhere. would you like me to dig them out and post them?

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[Blair Wolfram]

Taff;

Nice detail on the way you have the icosahedron based dome angle up at the ends at the riser wall.  An alternate is to use an octahedron base dome which allows a flat continuous riser wall height, and lets you elongate the dome.

--

[Dick Fischbeck]

A cylinder is simply curved, so it doesn't share the strength potential of a spherical structure. I wouldn't even call it geodesic since it has no great circles.

Everyone here probably already understands this.

That said, a cylinder can be a useful structure. I have not read everything in this thread. My 2 cents.

[TaffGoch]

On Fri, Jun 29, 2012 at 4:58 AM, Maventulep wrote:
>
> ...can you point me to a good explanation about that whole class and 
> method subdivision structure?

---------------------------------------------

Pages 106-107, of "Domebook 2"...

http://groups.google.com/group/geodesichelp/browse_thread/thread/51760c3c225ffd66 

... provides a concise summary/description.

-Taff

[Dick Fischbeck]

Other valuable resources: 

http://randome.info/geodesic-definitions

http://randome.info/geodesic-geometry